CVE-2026-12617: The issue is unexpected program termination based on ordering and/or specific content in responses to queries

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HIGH 7.5REMOTE

CVE-2026-12617 is a high-severity flaw (CVSS 7.5) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-617
Published	2026-07-22
Last modified	2026-10-24

Publisher (CNA): Internet Systems Consortium (ISC)

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-07-22 15:16 UTCPublished CVE record published
2026-10-24 18:10 UTCUpdated Record last modified

Exact fixes by distribution

Fedora 46 · uv · FIXED · 0.13.5-2.fc46 · FEDORA-2026-0a45cde16b · source

sudo dnf upgrade --advisory=FEDORA-2026-0a45cde16b

Fedora ELN · oo7 · FIXED · 0.7.0~beta-3.eln159 · FEDORA-2026-f348262964 · source

sudo dnf upgrade --advisory=FEDORA-2026-f348262964

Ubuntu 20.04 · bind9 · NOT AFFECTED

Ubuntu 22.04 · bind9 · FIXED · 1:9.18.39-0ubuntu0.22.04.5

sudo apt update && sudo apt install --only-upgrade bind9 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' bind9)" ge "1:9.18.39-0ubuntu0.22.04.5" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · bind9 · FIXED · 1:9.18.39-0ubuntu0.24.04.6

sudo apt update && sudo apt install --only-upgrade bind9 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' bind9)" ge "1:9.18.39-0ubuntu0.24.04.6" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 20.04 · isc-dhcp · NOT AFFECTED

Ubuntu 22.04 · isc-dhcp · NOT AFFECTED

Debian 12 · bind9 · FIXED · 1:9.18.49-1~deb12u2

sudo apt update && sudo apt install --only-upgrade bind9 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' bind9)" ge "1:9.18.49-1~deb12u2" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · bind9 · FIXED · 1:9.20.26-1~deb13u1

sudo apt update && sudo apt install --only-upgrade bind9 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' bind9)" ge "1:9.20.26-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · bind · NOT AFFECTED

RHEL 6 · bind · NOT AFFECTED

RHEL 7 · bind · NOT AFFECTED

RHEL 8 · bind · NOT AFFECTED

RHEL 8 · bind9.16 · NOT AFFECTED

Alpine 3.22 · bind · FIXED · bind-9.20.26-r0

apk add --upgrade bind apk info -v bind

Alpine 3.23 · bind · FIXED · bind-9.20.26-r0

apk add --upgrade bind apk info -v bind

Alpine 3.24 · bind · FIXED · bind-9.20.26-r0

apk add --upgrade bind apk info -v bind

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-2040 · source

sudo dnf update --advisory=ALAS2023-2026-2040

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-12617?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-12617 being exploited?

CVE-2026-12617 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-12617 affect?

CVE-2026-12617 affects affected software. Severity is high (CVSS 7.5). The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and

How urgent is CVE-2026-12617?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

References

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