| Name | CVE-2026-21863 |
| Description | Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing code does not validate that a clusterbus ping extension packet is located within buffer of the clusterbus packet before attempting to read it. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue. As an additional mitigation, don't expose the cluster bus connection directly to end users, and protect the connection with its own network ACLs. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6198-1 |
| Debian Bugs | 1130911, 1132205, 1132206 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| redict (PTS) | forky, sid | 7.3.6+ds-1 | vulnerable |
| redis (PTS) | bullseye | 5:6.0.16-1+deb11u2 | fixed |
| bullseye (security) | 5:6.0.16-1+deb11u8 | fixed | |
| bookworm, bookworm (security) | 5:7.0.15-1~deb12u6 | vulnerable | |
| trixie (security), trixie | 5:8.0.2-3+deb13u1 | vulnerable | |
| forky, sid | 5:8.0.5-1 | vulnerable | |
| valkey (PTS) | trixie | 8.1.1+dfsg1-3+deb13u1 | vulnerable |
| trixie (security) | 8.1.1+dfsg1-3+deb13u2 | fixed | |
| forky, sid | 8.1.4+dfsg1-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| redict | source | (unstable) | (unfixed) | 1132206 | ||
| redis | source | bullseye | (not affected) | |||
| redis | source | (unstable) | (unfixed) | 1132205 | ||
| valkey | source | trixie | 8.1.1+dfsg1-3+deb13u2 | DSA-6198-1 | ||
| valkey | source | (unstable) | 8.1.4+dfsg1-2 | 1130911 |
[bullseye] - redis <not-affected> (Vulnerable code not present, cluster branch merged for version 7.2.4-rc1)
https://github.com/valkey-io/valkey/security/advisories/GHSA-c677-q3wr-gggq
Fixed by: https://github.com/valkey-io/valkey/commit/416939303d2550aefff73ac180f41b84c12ba6c0 (8.1.6)