CVE-2026-94300: Replaying GSS-TSIG signed UDP messages can result in memory corruption in "`named`"

This month

HIGH 8.1REMOTE

CVE-2026-94300 is a high-severity flaw (CVSS 8.1) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Replaying GSS-TSIG signed UDP messages can result in memory corruption in "`named`". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote code execution. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 th

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-362, CWE-415
Published	2026-10-21
Last modified	2026-10-22

Publisher (CNA): Internet Systems Consortium (ISC)

Last updated 2026-10-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-10-21Published CVE record published
2026-10-22 23:20 UTCUpdated Record last modified

Exact fixes by distribution

Fedora 46 · rubygem-eventmachine · FIXED · 1.2.7-37.fc46 · FEDORA-2026-7194c202a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-7194c202a2

Debian 12 · bind9 · NO FIX YET

Debian 13 · bind9 · FIXED · 1:9.20.30-1~deb13u1

sudo apt update && sudo apt install --only-upgrade bind9 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' bind9)" ge "1:9.20.30-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · bind · NO FIX YET

RHEL 6 · bind · NO FIX YET

RHEL 7 · bind · NO FIX YET

RHEL 8 · bind · NO FIX YET

RHEL 8 · bind9.16 · NO FIX YET

Alpine 3.22 · bind · FIXED · bind-9.20.30-r0

apk add --upgrade bind apk info -v bind

Alpine 3.23 · bind · FIXED · bind-9.20.30-r0

apk add --upgrade bind apk info -v bind

Alpine 3.24 · bind · FIXED · bind-9.20.30-r0

apk add --upgrade bind apk info -v bind

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: Ibonok/CVE-2026-94300 (0 stars)

Advisories and coverage

Official advisories

Canadian Cyber Centre: ISC BIND security advisory (AV26-1072) 2026-10-21

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-2026-94300?

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

Is CVE-2026-94300 being exploited?

CVE-2026-94300 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-2026-94300 affect?

CVE-2026-94300 affects affected software. Severity is high (CVSS 8.1). Replaying GSS-TSIG signed UDP messages can result in memory corruption in "`named`". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to

How urgent is CVE-2026-94300?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Software pages

BIND DNS vulnerabilities

References

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