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Vulnerability · Published Sep 6, 2026 · Assigned by VulDB

CVE-2026-86227valkey-io valkey kvstore.c kvstoreGetHashtable out-of-bounds

Low 3.1

In plain English

A low-severity out-of-bounds read in valkey from valkey-io. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.1Low
Exploit odds (30 days)0.5%top 55.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A weakness has been identified in valkey-io valkey up to 9.0.5/9.1.1. This affects the function kvstoreGetHashtable of the file src/kvstore.c. This manipulation of the argument didx causes out-of-bounds read. It is possible to initiate the attack remotely. The attack is considered to have high complexity. It is indicated that the exploitability is difficult. The exploit has been made available to the public and could be used for attacks. Patch name: 4691888e7fab3df128f0bde5750c9fde2ae552fa. To fix this issue, it is recommended to deploy a patch. Exploitation requires cluster mode plus attacker-controlled dump.rdb at startup (data-dir write access, replication feed, or a stored crafted RDB) - an attacker-position DoS at boot, not network pre-auth. The issue report was closed stating it "is worth fixing for the sake of memory safety… but I don't think it meets our bar for a security disclosure."

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:14valkey9.1.2-1DEBIAN-CVE-2026-86227
Ubuntu:26.04:LTSvalkeyno fix listedUBUNTU-CVE-2026-86227
Ubuntu:26.10valkeyno fix listedUBUNTU-CVE-2026-86227

Affected products (as reported)

VendorProductVersions
valkey-io valkey 9.0.09.0.19.0.29.0.39.0.49.0.59.1.09.1.1

Weakness: CWE-125, CWE-119 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

References