CVE-2026-63639: CWE-416: Use After Free in valkey-io valkey
CVE-2026-63639 is a high-severity use-after-free vulnerability in the valkey distributed key-value database. It affects the RESTORE command prior to versions 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1. The flaw arises when a malformed RDB stream payload assigns a single Pending Entry List NACK to multiple consumers during stream consumer-group deserialization, leading to a use-after-free condition if one consumer is deleted while others still reference the shared NACK. This can potentially allow remote code execution. The issue is fixed in the specified patched versions.
AI Analysis
Technical Summary
Valkey versions prior to 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1 contain a use-after-free vulnerability (CWE-416) in the RESTORE command. The vulnerability occurs during stream consumer-group deserialization when a malformed RDB stream payload causes one Pending Entry List NACK to be assigned to multiple consumers. If one consumer is deleted while others still reference the shared NACK, a use-after-free condition arises, potentially enabling remote code execution. The vulnerability has a CVSS 3.1 score of 8.8 (high severity) with network attack vector, low attack complexity, requiring low privileges and no user interaction, impacting confidentiality, integrity, and availability. Fixed versions include 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with network access and low privileges to execute arbitrary code remotely on the affected system. The flaw compromises confidentiality, integrity, and availability of the valkey database service by leveraging a use-after-free condition in stream consumer-group deserialization.
Mitigation Recommendations
This vulnerability is fixed in valkey versions 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1. Users should upgrade to one of these versions or later to remediate the issue. No additional mitigations are indicated by the vendor advisory.
CVE-2026-63639: CWE-416: Use After Free in valkey-io valkey
Description
CVE-2026-63639 is a high-severity use-after-free vulnerability in the valkey distributed key-value database. It affects the RESTORE command prior to versions 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1. The flaw arises when a malformed RDB stream payload assigns a single Pending Entry List NACK to multiple consumers during stream consumer-group deserialization, leading to a use-after-free condition if one consumer is deleted while others still reference the shared NACK. This can potentially allow remote code execution. The issue is fixed in the specified patched versions.
CVSS v3.1
Score 8.8high
Affected software
valkey-io
valkey
pkg:github/valkey-io/valkeyRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Valkey versions prior to 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1 contain a use-after-free vulnerability (CWE-416) in the RESTORE command. The vulnerability occurs during stream consumer-group deserialization when a malformed RDB stream payload causes one Pending Entry List NACK to be assigned to multiple consumers. If one consumer is deleted while others still reference the shared NACK, a use-after-free condition arises, potentially enabling remote code execution. The vulnerability has a CVSS 3.1 score of 8.8 (high severity) with network attack vector, low attack complexity, requiring low privileges and no user interaction, impacting confidentiality, integrity, and availability. Fixed versions include 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with network access and low privileges to execute arbitrary code remotely on the affected system. The flaw compromises confidentiality, integrity, and availability of the valkey database service by leveraging a use-after-free condition in stream consumer-group deserialization.
Mitigation Recommendations
This vulnerability is fixed in valkey versions 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1. Users should upgrade to one of these versions or later to remediate the issue. No additional mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-17T14:11:15.482Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a846d94c6e8be0332554690
Added to database: 08/18/2026, 14:35:00 UTC
Last enriched: 09/11/2026, 21:33:58 UTC
Last updated: 10/02/2026, 04:46:44 UTC
Views: 69
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