Is CVE-2026-5947 in the CISA KEV catalog?

No. CVE-2026-5947 is not currently on the CISA Known Exploited Vulnerabilities list.

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

CVE-2026-5947 has a CVSS v3 base score of 7.5 (Important).

What is the EPSS score for CVE-2026-5947?

CVE-2026-5947 has an EPSS score of 1.39% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-5947?

Upgrade bind9 on debian 13 to 1:9.20.23-1~deb13u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-5947

HIGH

7.5

CVSS v3

NVD

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.

CWE-362Race Condition CWE-416Use After Free CWE-367TOCTOU Race Condition

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.20.23-1~deb13u1CVE-2026-5947

Fixed in:1:9.20.23-1CVE-2026-5947

bind9Ubuntu

Fixed in:1:9.18.39-0ubuntu0.22.04.4USN-8293-1

Fixed in:1:9.18.39-0ubuntu0.24.04.5USN-8293-1

Fixed in:1:9.20.11-1ubuntu2.4USN-8293-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.39%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Patch2

Vendor Advisory1

kb.isc.org

Other references4

Related Vulnerabilities

Other CWE-362 (Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-6387	High	8.1	100%	-	Fix
CVE-2023-36884	High	7.5	99%	KEV + Ransom	Fix
CVE-2018-15473	Medium	5.3	99%	-	Fix
CVE-2024-27983	High	8.2	87%	-	Fix
CVE-2014-0226	Medium	6.8	86%	-	Fix
CVE-2016-5195	High	7.0	84%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.