CVE detail
CVE-2026-21863
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.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 22.0 · diversity 13.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
8 source links · newest first
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21863.jsonsecurity.access.redhat.com
No excerpt available.
Vendor Advisorysecurity.access.redhat.comFeb 23, 2026, 8:28 PM - https://bugzilla.redhat.com/show_bug.cgi?id=2442026bugzilla.redhat.com
No excerpt available.
Exploitbugzilla.redhat.comFeb 23, 2026, 8:28 PM - https://access.redhat.com/security/cve/CVE-2026-21863access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comFeb 23, 2026, 8:28 PM - https://access.redhat.com/errata/RHSA-2026:8753access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comFeb 23, 2026, 8:28 PM - https://access.redhat.com/errata/RHSA-2026:5445access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comFeb 23, 2026, 8:28 PM - https://access.redhat.com/errata/RHSA-2026:3507access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comFeb 23, 2026, 8:28 PM - https://access.redhat.com/errata/RHSA-2026:3443access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comFeb 23, 2026, 8:28 PM No excerpt available.
Exploitgithub.comFeb 23, 2026, 8:28 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
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