Is CVE-2026-5950 in the CISA KEV catalog?

No. CVE-2026-5950 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-5950?

CVE-2026-5950 has a CVSS v3 base score of 5.3 (Moderate).

What is the EPSS score for CVE-2026-5950?

CVE-2026-5950 has an EPSS score of 0.55% (42th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-5950?

Upgrade bind9 on debian 12 to 1:9.18.49-1~deb12u1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2026-5950

MEDIUM

5.3

CVSS v3

NVD

Description

An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

CWE-606

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.18.49-1~deb12u1CVE-2026-5950

Fixed in:1:9.20.23-1~deb13u1CVE-2026-5950

Fixed in:1:9.20.23-1CVE-2026-5950

bindRed Hat / RHEL

Fixed in:main@aarch64RHSA-2026:20334

Fixed in:main@srcRHSA-2026:20334

Fixed in:main@x86_64RHSA-2026:20334

Fixed in:main@noarchRHSA-2026:20334

bindRocky

Fixed in:main@aarch64RHSA-2026:20334

Fixed in:main@srcRHSA-2026:20334

Fixed in:main@x86_64RHSA-2026:20334

Fixed in:main@noarchRHSA-2026:20334

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

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

AvailabilityLow

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

Exploit Intelligence

0.55%probability of exploitation in 30 days

42ndpercentile

Moderate risk: more likely to be exploited than 42% of all known CVEs.

References

Patch3

Vendor Advisory1

kb.isc.org

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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 2026-05-21.