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5 vulnerabilities by ZcashFoundation
CVE-2026-40881 (GCVE-0-2026-40881)
Vulnerability from cvelistv5 – Published: 2026-04-21 19:20 – Updated: 2026-04-21 20:36
VLAI?
Title
Zebra: addr/addrv2 Deserialization Resource Exhaustion
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-network version 5.0.1, when deserializing addr or addrv2 messages, which contain vectors of addresses, Zebra would fully deserialize them up to a maximum length (over 233,000) that was derived from the 2 MiB message size limit. This is much larger than the actual limit of 1,000 messages from the specification. Zebra would eventually check that limit but, at that point, the memory for the larger vector was already allocated. An attacker could cause out-of-memory aborts in Zebra by sending multiple such messages over different connections. This vulnerability is fixed in zebrad version 4.3.0 and zebra-network version 5.0.1.
Severity ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ZcashFoundation | zebrad |
Affected:
< 4.3.1
|
|||||||
|
|||||||||
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CVE-2026-40880 (GCVE-0-2026-40880)
Vulnerability from cvelistv5 – Published: 2026-04-21 19:18 – Updated: 2026-04-21 19:52
VLAI?
Title
Zebra: Cached Mempool Verification Bypasses Consensus Rules for Ahead-of-Tip Blocks
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2.
Severity ?
CWE
- CWE-1025 - Comparison Using Wrong Factors
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ZcashFoundation | zebrad |
Affected:
< 4.3.1
|
|||||||
|
|||||||||
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CVE-2026-34377 (GCVE-0-2026-34377)
Vulnerability from cvelistv5 – Published: 2026-03-31 14:05 – Updated: 2026-03-31 17:18
VLAI?
Title
Zebra has a Consensus Failure due to Improper Verification of V5 Transactions
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-consensus version 5.0.1, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By matching a valid transaction's txid while providing invalid authorization data, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This would not allow invalid transactions to be accepted but could result in a consensus split between vulnerable Zebra nodes and invulnerable Zebra and Zcashd nodes. This issue has been patched in zebrad version 4.3.0 and zebra-consensus version 5.0.1.
Severity ?
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
< 4.3.0
|
|||||||
|
|||||||||
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CVE-2026-34202 (GCVE-0-2026-34202)
Vulnerability from cvelistv5 – Published: 2026-03-31 14:02 – Updated: 2026-03-31 17:17
VLAI?
Title
Zebra node crash — V5 transaction hash panic (P2P reachable)
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a vulnerability in Zebra's transaction processing logic allows a remote, unauthenticated attacker to cause a Zebra node to panic (crash). This is triggered by sending a specially crafted V5 transaction that passes initial deserialization but fails during transaction ID calculation. This issue has been patched in zebrad version 4.3.0 and zebra-chain version 6.0.1.
Severity ?
CWE
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
< 4.3.0
|
|||||||
|
|||||||||
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CVE-2025-58359 (GCVE-0-2025-58359)
Vulnerability from cvelistv5 – Published: 2025-09-04 23:50 – Updated: 2025-09-05 16:06
VLAI?
Title
frost-core: refresh shares with smaller min_signers will reduce group security
Summary
ZF FROST is a Rust implementation of FROST (Flexible Round-Optimised Schnorr Threshold signatures). In versions 2.0.0 through 2.1.0, refresh shares with smaller min_signers will reduce security of group. The inability to change min_signers (i.e. the threshold) with the refresh share functionality (frost_core::keys::refresh module) was not made clear to users. Using a smaller value would not decrease the threshold, and attempts to sign using a smaller threshold would fail. Additionally, after refreshing the shares with a smaller threshold, it would still be possible to sign with the original threshold, potentially causing a security loss to the participant's shares. This issue is fixed in version 2.2.0.
Severity ?
CWE
- CWE-325 - Missing Cryptographic Step
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ZcashFoundation | frost |
Affected:
>= 2.0.0, < 2.2.0
|
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}
],
"role": "CISA Coordinator",
"timestamp": "2025-09-05T16:05:51.869099Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-09-05T16:06:05.432Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "frost",
"vendor": "ZcashFoundation",
"versions": [
{
"status": "affected",
"version": "\u003e= 2.0.0, \u003c 2.2.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "ZF FROST is a Rust implementation of FROST (Flexible Round-Optimised Schnorr Threshold signatures). In versions 2.0.0 through 2.1.0, refresh shares with smaller min_signers will reduce security of group. The inability to change min_signers (i.e. the threshold) with the refresh share functionality (frost_core::keys::refresh module) was not made clear to users. Using a smaller value would not decrease the threshold, and attempts to sign using a smaller threshold would fail. Additionally, after refreshing the shares with a smaller threshold, it would still be possible to sign with the original threshold, potentially causing a security loss to the participant\u0027s shares. This issue is fixed in version 2.2.0."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6,
"baseSeverity": "MEDIUM",
"privilegesRequired": "LOW",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-325",
"description": "CWE-325: Missing Cryptographic Step",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-09-04T23:50:45.746Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/ZcashFoundation/frost/security/advisories/GHSA-wgq8-vr6r-mqxm",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/ZcashFoundation/frost/security/advisories/GHSA-wgq8-vr6r-mqxm"
},
{
"name": "https://github.com/ZcashFoundation/frost/commit/379ef689c733b3d9c80fd409071d4f3af4dafed2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ZcashFoundation/frost/commit/379ef689c733b3d9c80fd409071d4f3af4dafed2"
},
{
"name": "https://github.com/ZcashFoundation/frost/releases/tag/frost-core%2Fv2.2.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ZcashFoundation/frost/releases/tag/frost-core%2Fv2.2.0"
}
],
"source": {
"advisory": "GHSA-wgq8-vr6r-mqxm",
"discovery": "UNKNOWN"
},
"title": "frost-core: refresh shares with smaller min_signers will reduce group security"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2025-58359",
"datePublished": "2025-09-04T23:50:45.746Z",
"dateReserved": "2025-08-29T16:19:59.010Z",
"dateUpdated": "2025-09-05T16:06:05.432Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}