CVE-2026-82631

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.55% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 45.9% of scored records. A rank, not a probability.

NVD base score

1.2 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-08-31.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-31 07:45Z1 MO AGO

Last updated

2026-08-31 11:33Z1 MO AGO

Reserved

2026-08-30

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Low (CVSS 2.1)

CNA CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-416Use After FreeVariant
• CWE-825Expired Pointer DereferenceBase

Data version

5.2

Document digest

21d82c983d52e1f12e36d0101eaf2a8963f19ac44108ddb730efc031784c5ea5

• vuldb.comVDB-397129 | valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after freehttps://vuldb.com/vuln/397129vdb-entrytechnical-description
• vuldb.comVDB-397129 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/397129/ctisignaturepermissions-required
• vuldb.comCVE-2026-82631 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-82631third-party-advisory
• vuldb.comSubmit #893793 | Valkey Project Valkey 9.1.0 Heap Use After Freehttps://vuldb.com/submit/893793third-party-advisory
• github.comhttps://github.com/valkey-io/valkey/issues/4198issue-tracking
• github.comhttps://github.com/valkey-io/valkey/pull/4212issue-trackingpatch
• github.comhttps://github.com/user-attachments/files/30111628/PoC.zipexploit
• github.comhttps://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20bpatch
• github.comhttps://github.com/valkey-io/valkey/product