CVE-2026-21863

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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
security-advisories@github.com https://github.com/valkey-io/valkey/security/advisories/GHSA-c677-q3wr-gggq
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:3443
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:3507
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:5445
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:8753
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/security/cve/CVE-2026-21863
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://bugzilla.redhat.com/show_bug.cgi?id=2442026
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21863.json

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:* valkey >= None < 7.2.12
cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:* valkey >= 8.0.0 < 8.0.7
cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:* valkey >= 8.1.0 < 8.1.6
cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:* valkey >= 9.0.0 < 9.0.2

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
valkey edge-main 9.0.3-r0 Jakub Jirutka <jakub@jirutka.cz> fixed
valkey edge-main 9.0.0-r1 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey edge-main 9.0.0-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey edge-main 8.1.4-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey edge-main 8.1.1-r2 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey edge-main 8.1.1-r1 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey edge-main 8.1.1-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey edge-main 7.2.9-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey edge-main 7.2.8-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey edge-main 7.2.7-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.23-main 9.0.3-r0 Jakub Jirutka <jakub@jirutka.cz> fixed
valkey 3.23-main 9.0.0-r1 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.22-main 8.1.6-r0 Jakub Jirutka <jakub@jirutka.cz> fixed
valkey 3.22-main 8.1.4-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.22-main 8.1.1-r2 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.22-main 8.1.1-r1 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.22-main 7.2.9-r0 None possibly vulnerable
valkey 3.22-main 7.2.8-r0 None possibly vulnerable
valkey 3.22-main 7.2.7-r0 None possibly vulnerable
valkey 3.21-main 7.2.12-r0 Jakub Jirutka <jakub@jirutka.cz> fixed
valkey 3.21-main 7.2.11-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.21-main 7.2.9-r1 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.21-main 7.2.9-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.21-main 7.2.8-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.21-main 7.2.7-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.20-main 7.2.11-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.20-main 7.2.9-r1 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.20-main 7.2.9-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.20-main 7.2.8-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
valkey 3.20-main 7.2.7-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable