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66 vulnerabilities by Eugeny
CVE-2026-116794 (GCVE-0-2026-116794)
Vulnerability from nvd – Published: 2026-10-28 17:06 – Updated: 2026-11-03 13:08
VLAI
EPSS
VEX
Title
russh: Agent server never calls `Agent::confirm`, so keys added with the confirm constraint (`ssh-add -c`) sign without confirmation
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From 0.50.0-beta.12 until 0.65.0, the agent server's Connection::try_sign path in russh/src/keys/agent/server.rs recognizes SSH_AGENT_CONSTRAIN_CONFIRM but returns a hard-coded successful result instead of calling Agent::confirm. In applications that override Agent::confirm to require user approval or another policy check, a process that can reach the agent socket, including the remote side of a forwarded agent, can use a key added through ssh-add -c without that check and can authenticate or sign data as the user while the key remains loaded. The separate Agent::confirm_request hook still runs for every signing request, so checks implemented there remain effective, and implementations that retain the default always-successful Agent::confirm do not lose an approval check through this regression. This issue is fixed in version 0.65.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-03 13:08 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/3e04597dc5… | x_refsource_MISC |
| https://github.com/Eugeny/russh/commit/62db6e7def… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-116775 (GCVE-0-2026-116775)
Vulnerability from nvd – Published: 2026-10-27 20:27 – Updated: 2026-11-03 12:14
VLAI
EPSS
VEX
Title
pageant: unbounded frame buffering on peer-controlled 4-byte length prefix (memory-exhaustion DoS)
Summary
pageant provides a PageantStream type that implements AsyncRead and AsyncWrite traits and can be used to communicate with a running Pageant instance. From 0.2.0 until 0.2.5, PageantStream::new in pageant/src/wmmessage.rs trusts a peer-controlled four-byte length prefix and buffers until len + 4 bytes are available without checking the fixed _AGENT_MAX_MSGLEN transport capacity. An application that bridges an SSH forwarded-agent channel to the raw stream can allow a malicious server to force large allocations or retain a partially filled frame, causing client memory exhaustion. This issue is fixed in version 0.2.5.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-03 12:13 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/69e4b55513… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-116774 (GCVE-0-2026-116774)
Vulnerability from nvd – Published: 2026-10-27 20:25 – Updated: 2026-10-28 16:13
VLAI
EPSS
VEX
Title
russh: peer-declared zero maximum packet size permanently stalls channel writes (silent AsyncWrite hang)
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From 0.60.0 until 0.65.0, channel-open parsing accepts a peer-declared maximum_packet_size of zero and passes it into ChannelTx::poll_writable in russh/src/channels/io/tx.rs. The Channel::data, Channel::make_writer, and Channel::into_stream asynchronous write paths then calculate a writable size of zero and remain pending forever because window adjustments cannot satisfy a static zero packet maximum. An authenticated client can strand server writes, and a malicious server can strand client writes, allowing affected tasks, channels, and connections to accumulate without surfacing an error. This issue is fixed in version 0.65.0.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-28 14:34 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/39cb9dbaa3… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-116773 (GCVE-0-2026-116773)
Vulnerability from nvd – Published: 2026-10-27 20:23 – Updated: 2026-10-30 15:17
VLAI
EPSS
VEX
Title
russh's SSH client is susceptible to unbounded allocations via EXT_INFO packets
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.65.0, the client Session::process_packet path in russh/src/client/encrypted.rs accepts repeated packets encoded with russh's private msg::EXT_INFO = 7 before authentication, while the standards-compliant EXT_INFO message number 82 does not reach the affected handler. The handle_ext_info function appends every parsed extension name to received_extensions without clearing, deduplicating, or bounding the vector. A malicious SSH server that deliberately sends private message number 7 can therefore retain an unbounded number of attacker-controlled extension names for the session lifetime, causing progressive client memory exhaustion. This issue is fixed in version 0.65.0.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 15:17 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/b33e93beec… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-116696 (GCVE-0-2026-116696)
Vulnerability from nvd – Published: 2026-10-27 20:14 – Updated: 2026-11-02 19:43
VLAI
EPSS
VEX
Title
russh's SSH agent server is susceptible to unbound allocations via repeated SSH_AGENT_CONSTRAIN_CONFIRM messages
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.65.0, russh::keys::agent::server::serve in russh/src/keys/agent/server.rs accepts repeated SSH_AGENT_CONSTRAIN_CONFIRM records while adding a key and appends every Constraint::Confirm record to the key's retained constraint vector without a count or memory limit. A process that can connect to the agent socket, including the remote side of a forwarded agent session, can repeatedly add constrained keys and cause renewable memory growth that persists for the process lifetime because keys without a lifetime constraint do not expire. This issue is fixed in version 0.65.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 19:43 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/23aa5d28fe… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-111061 (GCVE-0-2026-111061)
Vulnerability from nvd – Published: 2026-10-19 16:30 – Updated: 2026-10-19 18:29
VLAI
EPSS
VEX
Title
russh agent server converts constraint records into unbounded never-rolled-back tasks
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.64.1, the agent server spawns a separate long-lived task for every SSH_AGENT_CONSTRAIN_LIFETIME record in a constrained add-key request. The loop accepts repeated lifetime records, clones the key blob into each task, and does not roll back tasks when later constraint parsing fails. An attacker that can speak the agent protocol locally or through agent forwarding can exhaust memory and tasks until the agent process is starved or terminated, denying SSH agent service. This issue is fixed in version 0.64.1.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-19 18:29 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/4c305033d7… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.64.1 | x_refsource_MISC |
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CVE-2026-102825 (GCVE-0-2026-102825)
Vulnerability from nvd – Published: 2026-09-29 18:31 – Updated: 2026-09-30 19:29
VLAI
EPSS
VEX
Title
Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime path
Summary
Russh is a Rust SSH client and server library. Prior to 0.62.6, the USERAUTH_REQUEST path reached from server::run_stream in russh/src/server/encrypted.rs increments self.common.auth_attempts but never compares it with server::Config.max_auth_attempts. An unauthenticated remote client can continue submitting authentication requests on one connection beyond the configured cap, bypassing the deployment's attempt-limiting policy and increasing online guessing opportunity and backend authentication workload. This issue is fixed in version 0.62.6.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:29 UTC
CWE
- CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/f8fd0b11a3… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.62.6 | x_refsource_MISC |
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CVE-2026-102824 (GCVE-0-2026-102824)
Vulnerability from nvd – Published: 2026-09-29 18:27 – Updated: 2026-09-30 20:24
VLAI
EPSS
VEX
Title
Russh: Missing X25519 zero-point validation in hybrid ML-KEM key exchange
Summary
Russh is a Rust SSH client and server library. Prior to 0.63.0, the hybrid ML-KEM 768 and X25519 implementation in russh/src/kex/hybrid_mlkem.rs accepts an all-zero 32-byte peer X25519 public key in both server_dh and compute_shared_secret, forcing the X25519 contribution to the combined shared secret to zero. A malicious SSH peer can therefore make the combined secret depend only on ML-KEM, defeating the hybrid exchange's intended fallback protection if ML-KEM is later weakened. This issue is fixed in version 0.63.0.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 20:24 UTC
CWE
- CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/8da8967f19… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.0 | x_refsource_MISC |
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CVE-2026-102823 (GCVE-0-2026-102823)
Vulnerability from nvd – Published: 2026-09-29 18:25 – Updated: 2026-10-02 12:20
VLAI
EPSS
VEX
Title
russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened
Summary
Russh is a Rust SSH client and server library. Prior to 0.63.1, client_read_authenticated in russh/src/client/encrypted.rs forwards CHANNEL_DATA, CHANNEL_EXTENDED_DATA, CHANNEL_EOF, CHANNEL_CLOSE, CHANNEL_OPEN_FAILURE, CHANNEL_SUCCESS, CHANNEL_FAILURE, and CHANNEL_REQUEST subtypes exit-status, exit-signal, and xon-xoff to public client::Handler callbacks without confirming that the ChannelId belongs to a channel the client opened and established. A malicious SSH server can send lifecycle events for predicted, unopened, unconfirmed, or released channel identifiers, causing application panics or corrupting command completion and exit-code tracking. This issue is fixed in version 0.63.1.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 12:19 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/3430fd26ec… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.1 | x_refsource_MISC |
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CVE-2026-102822 (GCVE-0-2026-102822)
Vulnerability from nvd – Published: 2026-09-29 18:23 – Updated: 2026-09-29 19:53
VLAI
EPSS
VEX
Title
russh: negotiating a MAC-requiring block cipher (CTR/CBC) with mac=none causes a slice-index-out-of-range panic
Summary
Russh is a Rust SSH client and server library. Prior to 0.63.1, a connection configured to permit mac=none can negotiate it with a MAC-requiring CTR or CBC block cipher because the selection logic validates needs_mac() only when MAC selection fails. A remote peer can then send a packet with a decrypted length of zero, causing russh/src/cipher/mod.rs to shrink the previously read block before indexing buffer.buffer[16..], which panics and terminates the connection task. This issue is fixed in version 0.63.1.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 19:53 UTC
CWE
- CWE-129 - Improper Validation of Array Index
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/2885385abf… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.1 | x_refsource_MISC |
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CVE-2026-102821 (GCVE-0-2026-102821)
Vulnerability from nvd – Published: 2026-09-29 18:21 – Updated: 2026-09-30 19:35
VLAI
EPSS
VEX
Title
Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey
Summary
Russh is a Rust SSH client and server library. Prior to 0.63.2, an authenticated remote peer can send SSH_MSG_KEXINIT without the required SSH_MSG_KEX_ECDH_INIT and then flood SSH_MSG_CHANNEL_OPEN messages while SessionKexState::InProgress prevents priority_receiver in russh/src/server/session.rs from being drained. The server continues processing network input and enqueues a ChannelOpenReply for each request on an unbounded channel, allowing one connection to grow memory until the process is terminated. This issue is fixed in version 0.63.2.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:34 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/a282af361a… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.2 | x_refsource_MISC |
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CVE-2026-102820 (GCVE-0-2026-102820)
Vulnerability from nvd – Published: 2026-09-29 18:18 – Updated: 2026-09-30 20:11
VLAI
EPSS
VEX
Title
pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a malicious Pageant agent (Windows)
Summary
pageant provides a [PageantStream] type that implements [AsyncRead] and [AsyncWrite] traits and can be used to talk to a running Pageant instance. Prior to pageant 0.2.3, the Windows pageant crate's pageant/src/wmmessage.rs MemoryMap::read function trusts a peer-controlled u32 response length supplied through the 8192-byte Pageant shared-memory mapping reached by AgentClient::connect_pageant. A local process that impersonates the Pageant window can make query_pageant_direct allocate up to approximately 4 GiB and copy beyond the mapped view, reliably crashing a russh client and conditionally exposing adjacent committed memory. This issue is fixed in pageant 0.2.3.
Severity
6.2 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 20:11 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/5d566989eb… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.2 | x_refsource_MISC |
Impacted products
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CVE-2026-73489 (GCVE-0-2026-73489)
Vulnerability from nvd – Published: 2026-08-13 22:04 – Updated: 2026-08-17 19:50
VLAI
EPSS
VEX
Title
Russh: Post-auth remote panic via pty-req with more than 130 terminal-mode records
Summary
Russh is a Rust SSH client & server library. Prior to 0.62.4, an authenticated SSH client can cause a denial of service by sending a pty-req channel request with more than 130 terminal-mode records. The parser in russh/src/server/encrypted.rs stores terminal modes in a fixed 130-entry [(Pty::TTY_OP_END, 0); 130] array but continues increasing the mode count, then constructs an out-of-bounds slice and panics before the application pty_request handler runs. The panic terminates the server session task without causing memory corruption. This issue is fixed in version 0.62.4.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:50 UTC
CWE
- CWE-129 - Improper Validation of Array Index
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/8912512371… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.62.4 | x_refsource_MISC |
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CVE-2026-73430 (GCVE-0-2026-73430)
Vulnerability from nvd – Published: 2026-08-12 20:55 – Updated: 2026-08-13 17:53
VLAI
EPSS
VEX
Title
Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)
Summary
Russh is a Rust SSH client & server library. Prior to 0.62.4, an unauthenticated SSH client can cause a denial of service by sending SSH_MSG_KEX_ECDH_INIT with a 32-byte all-zero Q_C value. Curve25519Kex::server_dh in russh/src/kex/curve25519.rs accepts the all-zero peer public value and computes an all-zero shared secret, after which compute_exchange_hash calls encode_mpint in russh/src/kex/mod.rs and indexes beyond the end of the input while skipping leading zero bytes. The resulting panic occurs before authentication and terminates the server key-exchange task. This issue is fixed in version 0.62.4.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 17:49 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/a7fc1eb571… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.62.4 | x_refsource_MISC |
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CVE-2026-73429 (GCVE-0-2026-73429)
Vulnerability from nvd – Published: 2026-08-12 20:53 – Updated: 2026-08-14 22:15
VLAI
EPSS
VEX
Title
Russh: client wrong-length X25519 `clone_from_slice` panic (pre-auth DoS)
Summary
Russh is a Rust SSH client & server library. Prior to 0.62.4, a malicious SSH server can crash a russh client session with a malformed KEX_ECDH_REPLY containing a server ephemeral value that is not 32 bytes long. The client-side Curve25519Kex::compute_shared_secret function in russh/src/kex/curve25519.rs passes the decoded exchange.server_ephemeral value to clone_from_slice without validating its length, causing a deterministic panic before the server host key is verified. The panic terminates the spawned client session task and surfaces as a JoinError, while the embedding process normally remains running. This issue is fixed in version 0.62.4.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 22:15 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/a7fc1eb571… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.62.4 | x_refsource_MISC |
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CVE-2026-116794 (GCVE-0-2026-116794)
Vulnerability from cvelistv5 – Published: 2026-10-28 17:06 – Updated: 2026-11-03 13:08
VLAI
EPSS
VEX
Title
russh: Agent server never calls `Agent::confirm`, so keys added with the confirm constraint (`ssh-add -c`) sign without confirmation
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From 0.50.0-beta.12 until 0.65.0, the agent server's Connection::try_sign path in russh/src/keys/agent/server.rs recognizes SSH_AGENT_CONSTRAIN_CONFIRM but returns a hard-coded successful result instead of calling Agent::confirm. In applications that override Agent::confirm to require user approval or another policy check, a process that can reach the agent socket, including the remote side of a forwarded agent, can use a key added through ssh-add -c without that check and can authenticate or sign data as the user while the key remains loaded. The separate Agent::confirm_request hook still runs for every signing request, so checks implemented there remain effective, and implementations that retain the default always-successful Agent::confirm do not lose an approval check through this regression. This issue is fixed in version 0.65.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-03 13:08 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/3e04597dc5… | x_refsource_MISC |
| https://github.com/Eugeny/russh/commit/62db6e7def… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-116775 (GCVE-0-2026-116775)
Vulnerability from cvelistv5 – Published: 2026-10-27 20:27 – Updated: 2026-11-03 12:14
VLAI
EPSS
VEX
Title
pageant: unbounded frame buffering on peer-controlled 4-byte length prefix (memory-exhaustion DoS)
Summary
pageant provides a PageantStream type that implements AsyncRead and AsyncWrite traits and can be used to communicate with a running Pageant instance. From 0.2.0 until 0.2.5, PageantStream::new in pageant/src/wmmessage.rs trusts a peer-controlled four-byte length prefix and buffers until len + 4 bytes are available without checking the fixed _AGENT_MAX_MSGLEN transport capacity. An application that bridges an SSH forwarded-agent channel to the raw stream can allow a malicious server to force large allocations or retain a partially filled frame, causing client memory exhaustion. This issue is fixed in version 0.2.5.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-03 12:13 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/69e4b55513… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-116774 (GCVE-0-2026-116774)
Vulnerability from cvelistv5 – Published: 2026-10-27 20:25 – Updated: 2026-10-28 16:13
VLAI
EPSS
VEX
Title
russh: peer-declared zero maximum packet size permanently stalls channel writes (silent AsyncWrite hang)
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From 0.60.0 until 0.65.0, channel-open parsing accepts a peer-declared maximum_packet_size of zero and passes it into ChannelTx::poll_writable in russh/src/channels/io/tx.rs. The Channel::data, Channel::make_writer, and Channel::into_stream asynchronous write paths then calculate a writable size of zero and remain pending forever because window adjustments cannot satisfy a static zero packet maximum. An authenticated client can strand server writes, and a malicious server can strand client writes, allowing affected tasks, channels, and connections to accumulate without surfacing an error. This issue is fixed in version 0.65.0.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-28 14:34 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/39cb9dbaa3… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-116773 (GCVE-0-2026-116773)
Vulnerability from cvelistv5 – Published: 2026-10-27 20:23 – Updated: 2026-10-30 15:17
VLAI
EPSS
VEX
Title
russh's SSH client is susceptible to unbounded allocations via EXT_INFO packets
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.65.0, the client Session::process_packet path in russh/src/client/encrypted.rs accepts repeated packets encoded with russh's private msg::EXT_INFO = 7 before authentication, while the standards-compliant EXT_INFO message number 82 does not reach the affected handler. The handle_ext_info function appends every parsed extension name to received_extensions without clearing, deduplicating, or bounding the vector. A malicious SSH server that deliberately sends private message number 7 can therefore retain an unbounded number of attacker-controlled extension names for the session lifetime, causing progressive client memory exhaustion. This issue is fixed in version 0.65.0.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 15:17 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/b33e93beec… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-116696 (GCVE-0-2026-116696)
Vulnerability from cvelistv5 – Published: 2026-10-27 20:14 – Updated: 2026-11-02 19:43
VLAI
EPSS
VEX
Title
russh's SSH agent server is susceptible to unbound allocations via repeated SSH_AGENT_CONSTRAIN_CONFIRM messages
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.65.0, russh::keys::agent::server::serve in russh/src/keys/agent/server.rs accepts repeated SSH_AGENT_CONSTRAIN_CONFIRM records while adding a key and appends every Constraint::Confirm record to the key's retained constraint vector without a count or memory limit. A process that can connect to the agent socket, including the remote side of a forwarded agent session, can repeatedly add constrained keys and cause renewable memory growth that persists for the process lifetime because keys without a lifetime constraint do not expire. This issue is fixed in version 0.65.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 19:43 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/23aa5d28fe… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | x_refsource_MISC |
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CVE-2026-111061 (GCVE-0-2026-111061)
Vulnerability from cvelistv5 – Published: 2026-10-19 16:30 – Updated: 2026-10-19 18:29
VLAI
EPSS
VEX
Title
russh agent server converts constraint records into unbounded never-rolled-back tasks
Summary
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.64.1, the agent server spawns a separate long-lived task for every SSH_AGENT_CONSTRAIN_LIFETIME record in a constrained add-key request. The loop accepts repeated lifetime records, clones the key blob into each task, and does not roll back tasks when later constraint parsing fails. An attacker that can speak the agent protocol locally or through agent forwarding can exhaust memory and tasks until the agent process is starved or terminated, denying SSH agent service. This issue is fixed in version 0.64.1.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-19 18:29 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/4c305033d7… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.64.1 | x_refsource_MISC |
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CVE-2026-102825 (GCVE-0-2026-102825)
Vulnerability from cvelistv5 – Published: 2026-09-29 18:31 – Updated: 2026-09-30 19:29
VLAI
EPSS
VEX
Title
Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime path
Summary
Russh is a Rust SSH client and server library. Prior to 0.62.6, the USERAUTH_REQUEST path reached from server::run_stream in russh/src/server/encrypted.rs increments self.common.auth_attempts but never compares it with server::Config.max_auth_attempts. An unauthenticated remote client can continue submitting authentication requests on one connection beyond the configured cap, bypassing the deployment's attempt-limiting policy and increasing online guessing opportunity and backend authentication workload. This issue is fixed in version 0.62.6.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:29 UTC
CWE
- CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/f8fd0b11a3… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.62.6 | x_refsource_MISC |
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CVE-2026-102824 (GCVE-0-2026-102824)
Vulnerability from cvelistv5 – Published: 2026-09-29 18:27 – Updated: 2026-09-30 20:24
VLAI
EPSS
VEX
Title
Russh: Missing X25519 zero-point validation in hybrid ML-KEM key exchange
Summary
Russh is a Rust SSH client and server library. Prior to 0.63.0, the hybrid ML-KEM 768 and X25519 implementation in russh/src/kex/hybrid_mlkem.rs accepts an all-zero 32-byte peer X25519 public key in both server_dh and compute_shared_secret, forcing the X25519 contribution to the combined shared secret to zero. A malicious SSH peer can therefore make the combined secret depend only on ML-KEM, defeating the hybrid exchange's intended fallback protection if ML-KEM is later weakened. This issue is fixed in version 0.63.0.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 20:24 UTC
CWE
- CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/8da8967f19… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.0 | x_refsource_MISC |
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CVE-2026-102823 (GCVE-0-2026-102823)
Vulnerability from cvelistv5 – Published: 2026-09-29 18:25 – Updated: 2026-10-02 12:20
VLAI
EPSS
VEX
Title
russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened
Summary
Russh is a Rust SSH client and server library. Prior to 0.63.1, client_read_authenticated in russh/src/client/encrypted.rs forwards CHANNEL_DATA, CHANNEL_EXTENDED_DATA, CHANNEL_EOF, CHANNEL_CLOSE, CHANNEL_OPEN_FAILURE, CHANNEL_SUCCESS, CHANNEL_FAILURE, and CHANNEL_REQUEST subtypes exit-status, exit-signal, and xon-xoff to public client::Handler callbacks without confirming that the ChannelId belongs to a channel the client opened and established. A malicious SSH server can send lifecycle events for predicted, unopened, unconfirmed, or released channel identifiers, causing application panics or corrupting command completion and exit-code tracking. This issue is fixed in version 0.63.1.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 12:19 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/3430fd26ec… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.1 | x_refsource_MISC |
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CVE-2026-102822 (GCVE-0-2026-102822)
Vulnerability from cvelistv5 – Published: 2026-09-29 18:23 – Updated: 2026-09-29 19:53
VLAI
EPSS
VEX
Title
russh: negotiating a MAC-requiring block cipher (CTR/CBC) with mac=none causes a slice-index-out-of-range panic
Summary
Russh is a Rust SSH client and server library. Prior to 0.63.1, a connection configured to permit mac=none can negotiate it with a MAC-requiring CTR or CBC block cipher because the selection logic validates needs_mac() only when MAC selection fails. A remote peer can then send a packet with a decrypted length of zero, causing russh/src/cipher/mod.rs to shrink the previously read block before indexing buffer.buffer[16..], which panics and terminates the connection task. This issue is fixed in version 0.63.1.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 19:53 UTC
CWE
- CWE-129 - Improper Validation of Array Index
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/2885385abf… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.1 | x_refsource_MISC |
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CVE-2026-102821 (GCVE-0-2026-102821)
Vulnerability from cvelistv5 – Published: 2026-09-29 18:21 – Updated: 2026-09-30 19:35
VLAI
EPSS
VEX
Title
Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey
Summary
Russh is a Rust SSH client and server library. Prior to 0.63.2, an authenticated remote peer can send SSH_MSG_KEXINIT without the required SSH_MSG_KEX_ECDH_INIT and then flood SSH_MSG_CHANNEL_OPEN messages while SessionKexState::InProgress prevents priority_receiver in russh/src/server/session.rs from being drained. The server continues processing network input and enqueues a ChannelOpenReply for each request on an unbounded channel, allowing one connection to grow memory until the process is terminated. This issue is fixed in version 0.63.2.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:34 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/a282af361a… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.2 | x_refsource_MISC |
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CVE-2026-102820 (GCVE-0-2026-102820)
Vulnerability from cvelistv5 – Published: 2026-09-29 18:18 – Updated: 2026-09-30 20:11
VLAI
EPSS
VEX
Title
pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a malicious Pageant agent (Windows)
Summary
pageant provides a [PageantStream] type that implements [AsyncRead] and [AsyncWrite] traits and can be used to talk to a running Pageant instance. Prior to pageant 0.2.3, the Windows pageant crate's pageant/src/wmmessage.rs MemoryMap::read function trusts a peer-controlled u32 response length supplied through the 8192-byte Pageant shared-memory mapping reached by AgentClient::connect_pageant. A local process that impersonates the Pageant window can make query_pageant_direct allocate up to approximately 4 GiB and copy beyond the mapped view, reliably crashing a russh client and conditionally exposing adjacent committed memory. This issue is fixed in pageant 0.2.3.
Severity
6.2 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 20:11 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/5d566989eb… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.63.2 | x_refsource_MISC |
Impacted products
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CVE-2026-73489 (GCVE-0-2026-73489)
Vulnerability from cvelistv5 – Published: 2026-08-13 22:04 – Updated: 2026-08-17 19:50
VLAI
EPSS
VEX
Title
Russh: Post-auth remote panic via pty-req with more than 130 terminal-mode records
Summary
Russh is a Rust SSH client & server library. Prior to 0.62.4, an authenticated SSH client can cause a denial of service by sending a pty-req channel request with more than 130 terminal-mode records. The parser in russh/src/server/encrypted.rs stores terminal modes in a fixed 130-entry [(Pty::TTY_OP_END, 0); 130] array but continues increasing the mode count, then constructs an out-of-bounds slice and panics before the application pty_request handler runs. The panic terminates the server session task without causing memory corruption. This issue is fixed in version 0.62.4.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:50 UTC
CWE
- CWE-129 - Improper Validation of Array Index
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/8912512371… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.62.4 | x_refsource_MISC |
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CVE-2026-73430 (GCVE-0-2026-73430)
Vulnerability from cvelistv5 – Published: 2026-08-12 20:55 – Updated: 2026-08-13 17:53
VLAI
EPSS
VEX
Title
Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)
Summary
Russh is a Rust SSH client & server library. Prior to 0.62.4, an unauthenticated SSH client can cause a denial of service by sending SSH_MSG_KEX_ECDH_INIT with a 32-byte all-zero Q_C value. Curve25519Kex::server_dh in russh/src/kex/curve25519.rs accepts the all-zero peer public value and computes an all-zero shared secret, after which compute_exchange_hash calls encode_mpint in russh/src/kex/mod.rs and indexes beyond the end of the input while skipping leading zero bytes. The resulting panic occurs before authentication and terminates the server key-exchange task. This issue is fixed in version 0.62.4.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 17:49 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/a7fc1eb571… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.62.4 | x_refsource_MISC |
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CVE-2026-73429 (GCVE-0-2026-73429)
Vulnerability from cvelistv5 – Published: 2026-08-12 20:53 – Updated: 2026-08-14 22:15
VLAI
EPSS
VEX
Title
Russh: client wrong-length X25519 `clone_from_slice` panic (pre-auth DoS)
Summary
Russh is a Rust SSH client & server library. Prior to 0.62.4, a malicious SSH server can crash a russh client session with a malformed KEX_ECDH_REPLY containing a server ephemeral value that is not 32 bytes long. The client-side Curve25519Kex::compute_shared_secret function in russh/src/kex/curve25519.rs passes the decoded exchange.server_ephemeral value to clone_from_slice without validating its length, causing a deterministic panic before the server host key is verified. The panic terminates the spawned client session task and surfaces as a JoinError, while the embedding process normally remains running. This issue is fixed in version 0.62.4.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 22:15 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Eugeny/russh/security/advisori… | x_refsource_CONFIRM |
| https://github.com/Eugeny/russh/commit/a7fc1eb571… | x_refsource_MISC |
| https://github.com/Eugeny/russh/releases/tag/v0.62.4 | x_refsource_MISC |
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