CVE detail
CVE-2026-5947
Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIND receives an incoming DNS message signed with SIG(0), it begins work to validate that signature. If, during that validation, the "recursive-clients" limit is reached (as would occur during a query flood), and that same DNS message is discarded per the limit, there is a brief window of time while the SIG(0) validation may attempt to read the now-discarded DNS message. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.28 through 9.18.49 and 9.18.28-S1 through 9.18.49-S1 are NOT affected.
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 20.0 · 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
Information published.
vendormsrc.microsoft.comMay 23, 2026, 8:01 AM- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5947.jsonsecurity.access.redhat.com
No excerpt available.
Vendor Advisorysecurity.access.redhat.comMay 20, 2026, 1:16 PM - https://bugzilla.redhat.com/show_bug.cgi?id=2479772bugzilla.redhat.com
No excerpt available.
Exploitbugzilla.redhat.comMay 20, 2026, 1:16 PM - https://access.redhat.com/security/cve/CVE-2026-5947access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 20, 2026, 1:16 PM - https://access.redhat.com/errata/RHSA-2026:7412access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 20, 2026, 1:16 PM - https://kb.isc.org/docs/cve-2026-5947kb.isc.org
No excerpt available.
Vendor Advisorykb.isc.orgMay 20, 2026, 1:16 PM - https://downloads.isc.org/isc/bind9/9.21.22downloads.isc.org
No excerpt available.
Patchdownloads.isc.orgMay 20, 2026, 1:16 PM - https://downloads.isc.org/isc/bind9/9.20.23downloads.isc.org
No excerpt available.
Patchdownloads.isc.orgMay 20, 2026, 1:16 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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