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Fencer Vulns
low 2.4

CVE-2026-82677 json

valkey-io valkey Module Timer module.c moduleTimerHandler double free

published 2026-08-31 2 mo ago modified 2026-08-31 2 mo ago also EUVD-2026-68457

cvss
2.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

A vulnerability was determined in valkey-io valkey 9.1.0. Impacted is the function moduleTimerHandler of the file src/module.c of the component Module Timer Subsystem. This manipulation causes double free. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: b349fe2821e3998534b1454c1b64a478daf8c6b7. To fix this issue, it is recommended to deploy a patch.

Patch / fix

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

debian advisories DEBIAN-CVE-2026-82677

  • 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

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-2026-82677 updated cvss 4.9

valkey: Valkey: Denial of Service via double free in Module Timer subsystem

  • Red Hat Enterprise Linux 9 valkey, rhel9/valkey-8 Red Hat Enterprise Linux 10 valkey, rhel10/valkey-8
    affected: workaround, 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
2 mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • vuldb.com https://vuldb.com/submit/893959 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/valkey-io/valkey/issues/4200 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/user-attachments/files/30118801/PoC.zip referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 4.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CNA 3.1 2.4 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
CNA 3.0 2.4 CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
CNA 2.0 3.3 AV:N/AC:L/Au:M/C:N/I:N/A:P/E:POC/RL:OF/RC:C
CNA 4.0 1.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/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 2.4 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L
CNA 2.0 3.3 AV:N/AC:L/Au:M/C:N/I:N/A:P

Affected products

  • valkey-io valkey

Classification

Weakness
  • CWE-415 Double Free
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

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