Skip to content
Fencer Intel
low 2.2

CVE-2026-82631 json

valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free

published 2mo ago modified 2mo ago also EUVD-2026-68393

cvss
2.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

A security flaw has been discovered in valkey-io valkey 9.1.0. The affected element is the function handleClientsBlockedOnKey of the file src/blocked.c of the component Blocked-on-keys Subsystem. The manipulation results in use after free. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is described as difficult. The exploit has been released to the public and may be used for attacks. The patch is identified as b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b. Applying a patch is advised to resolve this issue.

Patch / fix

  • valkey Debian 13 8.1.1+dfsg1-3+deb13u3
  • valkey Debian 14 9.1.2-1

debian advisories DEBIAN-CVE-2026-82631

  • valkey hummingbird 1 9.0.6-0.1.hum1
  • valkey-rdma hummingbird 1 9.0.6-0.1.hum1
  • valkey-compat-redis hummingbird 1 9.0.6-0.1.hum1

red hat advisories RHSA-2026:61884

  • valkey Azure Linux 3.0 8.0.11-1

azure linux advisories AZL-98439

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-82631 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-82631 updated

valkey: Valkey: Use-after-free vulnerability in Blocked-on-keys subsystem

  • Red Hat Enterprise Linux 9 valkey, rhel9/valkey-8 Red Hat Enterprise Linux 10 valkey, rhel10/valkey-8
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images valkey 9.0.6-0.1.hum1, valkey-rdma 9.0.6-0.1.hum1, valkey-compat-redis 9.0.6-0.1.hum1
    fixed: vendor fix RHSA-2026:61884

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/user-attachments/files/30111628/PoC.zip referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 2.1 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
CNA 3.1 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
CNA 3.0 2.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
CNA 2.0 1.7 AV:N/AC:H/Au:M/C:N/I:N/A:P/E:POC/RL:OF/RC:C
CNA 4.0 1.2 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
CNA 3.1 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
CNA 2.0 1.7 AV:N/AC:H/Au:M/C:N/I:N/A:P

Affected products

  • valkey-io valkey

Classification

Weakness
  • CWE-416 Use After Free
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.