PT-2026-42164 · Isc+3 · Bind 9+3
Published
2026-05-17
·
Updated
2026-07-02
·
CVE-2026-5947
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
BIND 9 versions 9.20.0 through 9.20.22
BIND 9 versions 9.21.0 through 9.21.21
BIND 9 versions 9.20.9-S1 through 9.20.22-S1
Description
A race condition occurs when BIND receives an incoming DNS message signed with SIG(0). While validating the signature, if the
recursive-clients limit is reached (such as during a query flood) and the message is discarded, a use-after-free violation may occur. This happens because the SIG(0) validation process may attempt to read the DNS message after it has been discarded, leading to undefined behavior. Use-after-free is a scenario where a program continues to use a pointer after it has been freed, which can lead to crashes or unpredictable execution.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
RCE
Race Condition
Time Of Check To Time Of Use
Use After Free
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Related Identifiers
Affected Products
Bind 9
Bind Server
Linuxmint
Ubuntu