Is CVE-2026-5947 actively exploited?

No active exploitation of CVE-2026-5947 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-5947 be exploited remotely?

Yes. CVE-2026-5947 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-5947?

CVE-2026-5947 has a CVSS score of 5.9 (MEDIUM).

HOME VULNERABILITIESCVE-2026-5947

MEDIUM

CVE-2026-5947

CWE-362Published: May 20, 2026· Updated: May 21, 2026

5.9

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:10.0th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-5947 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.9.