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CVE-2026-27623 (GCVE-0-2026-27623)

Vulnerability from nvd – Published: 2026-02-23 19:43 – Updated: 2026-06-30 03:20

Title

Valkey has Pre-Authentication DOS from malformed RESP request

Summary

Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious actor with network access to Valkey can cause the system to abort by triggering an assertion. When processing incoming requests, the Valkey system does not properly reset the networking state after processing an empty request. A malicious actor can then send a request that the server incorrectly identifies as breaking server side invariants, which results in the server shutting down. Version 9.0.3 fixes the issue. As an additional mitigation, properly isolate Valkey deployments so that only trusted users have access.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-20 - Improper Input Validation
CWE-617 - Reachable Assertion

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/valkey-io/valkey/security/advi…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-27623	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442021	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

3 products

Vendor	Product	Version
valkey-io	valkey	Affected: >= 9.0.0, < 9.0.3
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

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JSON

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CVE-2026-21863 (GCVE-0-2026-21863)

Vulnerability from nvd – Published: 2026-02-23 19:41 – Updated: 2026-06-30 03:20

Title

Malformed Valkey Cluster bus message can lead to Remote DoS

Summary

Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing code does not validate that a clusterbus ping extension packet is located within buffer of the clusterbus packet before attempting to read it. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue. As an additional mitigation, don't expose the cluster bus connection directly to end users, and protect the connection with its own network ACLs.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

8 references

URL	Tags
https://github.com/valkey-io/valkey/security/advi…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-21863	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442026	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:5445	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3443	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3507	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8753	vendor-advisoryx_refsource_REDHAT

Impacted products

5 products

Vendor	Product	Version
valkey-io	valkey	Affected: < 7.2.12 Affected: >= 8.0.0, < 8.0.7 Affected: >= 8.1.0, < 8.1.6 Affected: >= 9.0.0, < 9.0.2
Red Hat	Red Hat Enterprise Linux AppStream EUS (v. 10.0)	cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux AppStream (v. 10)	cpe:/o:redhat:enterprise_linux:10.1
Red Hat	Red Hat Enterprise Linux AppStream (v. 9)	cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat	Red Hat Hardened Images	cpe:/a:redhat:hummingbird:1

Show details on NVD website

JSON

To clipboard

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CVE-2025-67733 (GCVE-0-2025-67733)

Vulnerability from nvd – Published: 2026-02-23 19:39 – Updated: 2026-06-30 03:18

Title

Valkey Affected by RESP Protocol Injection via Lua error_reply

Summary

Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious user can use scripting commands to inject arbitrary information into the response stream for the given client, potentially corrupting or returning tampered data to other users on the same connection. The error handling code for lua scripts does not properly handle null characters. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue.

Severity

8.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-170 - Improper Null Termination

Assigner

GitHub_M

References

7 references

URL	Tags
https://github.com/valkey-io/valkey/security/advi…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2025-67733	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442025	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:5445	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3443	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3507	vendor-advisoryx_refsource_REDHAT

Impacted products

4 products

Vendor	Product	Version
valkey-io	valkey	Affected: < 7.2.12 Affected: >= 8.0.0, < 8.0.7 Affected: >= 8.1.0, < 8.1.6 Affected: >= 9.0.0, < 9.0.2
Red Hat	Red Hat Enterprise Linux AppStream EUS (v. 10.0)	cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux AppStream (v. 10)	cpe:/o:redhat:enterprise_linux:10.1
Red Hat	Red Hat Enterprise Linux AppStream (v. 9)	cpe:/a:redhat:enterprise_linux:9::appstream

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CVE-2025-49844 (GCVE-0-2025-49844)

Vulnerability from nvd – Published: 2025-10-03 19:27 – Updated: 2026-03-20 14:08

KEVIntel

Title

Redis Lua Use-After-Free may lead to remote code execution

Summary

Redis is an open source, in-memory database that persists on disk. Versions 8.2.1 and below allow an authenticated user to use a specially crafted Lua script to manipulate the garbage collector, trigger a use-after-free and potentially lead to remote code execution. The problem exists in all versions of Redis with Lua scripting. This issue is fixed in version 8.2.2. To workaround this issue without patching the redis-server executable is to prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands.

Severity

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

5 references

URL	Tags
https://github.com/redis/redis/security/advisorie…	x_refsource_CONFIRM
https://github.com/redis/redis/commit/d5728cb5795…	x_refsource_MISC
https://github.com/redis/redis/releases/tag/8.2.2	x_refsource_MISC
https://github.com/lastvocher/redis-CVE-2025-49844	exploit
http://www.openwall.com/lists/oss-security/2025/10/07/2

Impacted products

1 product

Vendor	Product	Version
redis	redis	Affected: < 8.2.2

Show details on NVD website

JSON

To clipboard

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CVE-2025-21605 (GCVE-0-2025-21605)

Vulnerability from nvd – Published: 2025-04-23 15:38 – Updated: 2026-02-10 17:06

Title

Redis DoS Vulnerability due to unlimited growth of output buffers abused by unauthenticated client

Summary

Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unlimitedly over time. As a result, the service is exhausted and the memory is unavailable. When password authentication is enabled on the Redis server, but no password is provided, the client can still cause the output buffer to grow from "NOAUTH" responses until the system will run out of memory. This issue has been patched in version 7.4.3. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways. Either using network access control tools like firewalls, iptables, security groups, etc, or enabling TLS and requiring users to authenticate using client side certificates.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

6 references

URL	Tags
https://github.com/redis/redis/security/advisorie…	x_refsource_CONFIRM
https://github.com/redis/redis/releases/tag/7.4.3	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2025…
https://github.com/valkey-io/valkey/releases/tag/8.1.1
https://www.vicarius.io/vsociety/posts/cve-2025-2…
https://www.vicarius.io/vsociety/posts/cve-2025-2…

Impacted products

1 product

Vendor	Product	Version
redis	redis	Affected: >= 2.6, < 7.4.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-27623 (GCVE-0-2026-27623)

Vulnerability from cvelistv5 – Published: 2026-02-23 19:43 – Updated: 2026-06-30 03:20

Title

Valkey has Pre-Authentication DOS from malformed RESP request

Summary

Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious actor with network access to Valkey can cause the system to abort by triggering an assertion. When processing incoming requests, the Valkey system does not properly reset the networking state after processing an empty request. A malicious actor can then send a request that the server incorrectly identifies as breaking server side invariants, which results in the server shutting down. Version 9.0.3 fixes the issue. As an additional mitigation, properly isolate Valkey deployments so that only trusted users have access.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-20 - Improper Input Validation
CWE-617 - Reachable Assertion

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/valkey-io/valkey/security/advi…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-27623	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442021	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

3 products

Vendor	Product	Version
valkey-io	valkey	Affected: >= 9.0.0, < 9.0.3
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Show details on NVD website

JSON

To clipboard

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CVE-2026-21863 (GCVE-0-2026-21863)

Vulnerability from cvelistv5 – Published: 2026-02-23 19:41 – Updated: 2026-06-30 03:20

Title

Malformed Valkey Cluster bus message can lead to Remote DoS

Summary

Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing code does not validate that a clusterbus ping extension packet is located within buffer of the clusterbus packet before attempting to read it. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue. As an additional mitigation, don't expose the cluster bus connection directly to end users, and protect the connection with its own network ACLs.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

8 references

URL	Tags
https://github.com/valkey-io/valkey/security/advi…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-21863	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442026	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:5445	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3443	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:3507	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8753	vendor-advisoryx_refsource_REDHAT

Impacted products

5 products

Vendor	Product	Version
valkey-io	valkey	Affected: < 7.2.12 Affected: >= 8.0.0, < 8.0.7 Affected: >= 8.1.0, < 8.1.6 Affected: >= 9.0.0, < 9.0.2
Red Hat	Red Hat Enterprise Linux AppStream EUS (v. 10.0)	cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux AppStream (v. 10)	cpe:/o:redhat:enterprise_linux:10.1
Red Hat	Red Hat Enterprise Linux AppStream (v. 9)	cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat	Red Hat Hardened Images	cpe:/a:redhat:hummingbird:1

Show details on NVD website

JSON

To clipboard

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CVE-2025-67733 (GCVE-0-2025-67733)

Vulnerability from cvelistv5 – Published: 2026-02-23 19:39 – Updated: 2026-06-30 03:18

Title

Valkey Affected by RESP Protocol Injection via Lua error_reply

Summary

Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious user can use scripting commands to inject arbitrary information into the response stream for the given client, potentially corrupting or returning tampered data to other users on the same connection. The error handling code for lua scripts does not properly handle null characters. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue.

Severity

8.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-170 - Improper Null Termination

Assigner

GitHub_M

References

7 references

URL	Tags
https://github.com/valkey-io/valkey/security/advi…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2025-67733	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442025	issue-trackingx_refsource_REDHAT
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https://access.redhat.com/errata/RHSA-2026:3507	vendor-advisoryx_refsource_REDHAT

Impacted products

4 products

Vendor	Product	Version
valkey-io	valkey	Affected: < 7.2.12 Affected: >= 8.0.0, < 8.0.7 Affected: >= 8.1.0, < 8.1.6 Affected: >= 9.0.0, < 9.0.2
Red Hat	Red Hat Enterprise Linux AppStream EUS (v. 10.0)	cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux AppStream (v. 10)	cpe:/o:redhat:enterprise_linux:10.1
Red Hat	Red Hat Enterprise Linux AppStream (v. 9)	cpe:/a:redhat:enterprise_linux:9::appstream

Show details on NVD website

JSON

To clipboard

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CVE-2025-49844 (GCVE-0-2025-49844)

Vulnerability from cvelistv5 – Published: 2025-10-03 19:27 – Updated: 2026-03-20 14:08

KEVIntel

Title

Redis Lua Use-After-Free may lead to remote code execution

Summary

Redis is an open source, in-memory database that persists on disk. Versions 8.2.1 and below allow an authenticated user to use a specially crafted Lua script to manipulate the garbage collector, trigger a use-after-free and potentially lead to remote code execution. The problem exists in all versions of Redis with Lua scripting. This issue is fixed in version 8.2.2. To workaround this issue without patching the redis-server executable is to prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands.

Severity

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

5 references

URL	Tags
https://github.com/redis/redis/security/advisorie…	x_refsource_CONFIRM
https://github.com/redis/redis/commit/d5728cb5795…	x_refsource_MISC
https://github.com/redis/redis/releases/tag/8.2.2	x_refsource_MISC
https://github.com/lastvocher/redis-CVE-2025-49844	exploit
http://www.openwall.com/lists/oss-security/2025/10/07/2

Impacted products

1 product

Vendor	Product	Version
redis	redis	Affected: < 8.2.2

Show details on NVD website

JSON

To clipboard

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CVE-2025-21605 (GCVE-0-2025-21605)

Vulnerability from cvelistv5 – Published: 2025-04-23 15:38 – Updated: 2026-02-10 17:06

Title

Redis DoS Vulnerability due to unlimited growth of output buffers abused by unauthenticated client

Summary

Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unlimitedly over time. As a result, the service is exhausted and the memory is unavailable. When password authentication is enabled on the Redis server, but no password is provided, the client can still cause the output buffer to grow from "NOAUTH" responses until the system will run out of memory. This issue has been patched in version 7.4.3. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways. Either using network access control tools like firewalls, iptables, security groups, etc, or enabling TLS and requiring users to authenticate using client side certificates.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

6 references

URL	Tags
https://github.com/redis/redis/security/advisorie…	x_refsource_CONFIRM
https://github.com/redis/redis/releases/tag/7.4.3	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2025…
https://github.com/valkey-io/valkey/releases/tag/8.1.1
https://www.vicarius.io/vsociety/posts/cve-2025-2…
https://www.vicarius.io/vsociety/posts/cve-2025-2…

Impacted products

1 product

Vendor	Product	Version
redis	redis	Affected: >= 2.6, < 7.4.3

Show details on NVD website

JSON

To clipboard

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        },
        {
          "name": "https://github.com/redis/redis/releases/tag/7.4.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/redis/redis/releases/tag/7.4.3"
        }
      ],
      "source": {
        "advisory": "GHSA-r67f-p999-2gff",
        "discovery": "UNKNOWN"
      },
      "title": "Redis DoS Vulnerability due to unlimited growth of output buffers abused by unauthenticated client"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-21605",
    "datePublished": "2025-04-23T15:38:11.042Z",
    "dateReserved": "2024-12-29T03:00:24.712Z",
    "dateUpdated": "2026-02-10T17:06:50.695Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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10 vulnerabilities found for valkey by lfprojects

CVE-2026-27623 (GCVE-0-2026-27623)

CVE-2026-21863 (GCVE-0-2026-21863)

CVE-2025-67733 (GCVE-0-2025-67733)

CVE-2025-49844 (GCVE-0-2025-49844)

CVE-2025-21605 (GCVE-0-2025-21605)

CVE-2026-27623 (GCVE-0-2026-27623)

CVE-2026-21863 (GCVE-0-2026-21863)

CVE-2025-67733 (GCVE-0-2025-67733)

CVE-2025-49844 (GCVE-0-2025-49844)

CVE-2025-21605 (GCVE-0-2025-21605)