CVE-2026-82677: valkey-io valkey
Vulnerability summary
CVE-2026-82677 is a medium (CVSS 4.8) vulnerability in valkey-io valkey. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 42.6% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 31-08-2026PublishedVulnerability first disclosed.
- 31-08-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
10 scores · 4 sources · 4 versions- OSV · UbuntuEcosystem advisory · calculated4.8MediumCVSS: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
- OSV · DebianEcosystem advisory · calculated4.8MediumCVSS: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
- NVDNIST1.9LowCVSS: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:XDiffers
- OSV · UbuntuEcosystem advisory · calculated2.4LowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L
- NVDNIST2.4LowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L
- NVDNIST3.3LowAV:N/AC:L/Au:M/C:N/I:N/A:P
EPSS trend
Probability
0.52%
Chance of exploitation in the next 30 days
Percentile
43%
Versus all other CVEs
30-day change
+0.23 pp
From 0.29% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundFiles
Maturity: poc
Weaknesses
CWE · root cause- CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
- CWE-415Double FreeThe product calls free() twice on the same memory address.
Affected systems
Debian3 products
- redictAll versions (No fix recorded)
- redisAll versions (No fix recorded)
- valkeyAll versions (No fix recorded) | < 9.1.2-1
Ubuntu1 product
- valkeyAll versions (No fix recorded)
Valkey-io1 product
- valkey9.1.0
3 vendors · 5 products
