VulnerabilityPublished 28 Jul 2026

CVE-2026-6949: Samba · TSIG packet with name compression can crash DNS

Affects sambaSource GCVE Database

Mentioned vulnerabilities

Not known to be exploited · fixed in 2:4.15.13+dfsg-0ubuntu1.13 : update samba when convenient.

Data as of 25 Oct 2026, 10:17 UTC

Severity

Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

Patch: Available – fixed in 2:4.15.13+dfsg-0ubuntu1.13, 2:4.19.5+dfsg-4ubuntu9.7, 2:4.23.6+dfsg-1ubuntu2.2

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade the Ubuntu samba to 2:4.15.13+dfsg-0ubuntu1.13 (package) or 2:4.19.5+dfsg-4ubuntu9.7 (package) or 2:4.23.6+dfsg-1ubuntu2.2 (package).

Patches and advisories

ubuntu.com/security/notices/USN-8621-1 (opens in a new tab)

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSsamba`pkg:deb/ubuntu/samba?arch=source&distro=resolute`Other threats	Affected <2:4.23.6+dfsg-1ubuntu2.2	Fixed in 2:4.23.6+dfsg-1ubuntu2.2
Ubuntu 24.04 LTSsamba`pkg:deb/ubuntu/samba?arch=source&distro=noble`Other threats	Affected <2:4.19.5+dfsg-4ubuntu9.7	Fixed in 2:4.19.5+dfsg-4ubuntu9.7
Ubuntu 22.04 LTSsamba`pkg:deb/ubuntu/samba?arch=source&distro=jammy`Other threats	Affected <2:4.15.13+dfsg-0ubuntu1.13	Fixed in 2:4.15.13+dfsg-0ubuntu1.13
Ubuntu Pro 20.04 LTSsamba`pkg:deb/ubuntu/samba?arch=source&distro=esm-infra/focal`Other threats	Affected 2:4.10.7+dfsg-0ubuntu2 – 2:4.15.13+dfsg-0ubuntu0.20.04.8+esm2 37 affected builds	Fixed in–
Ubuntu Pro 18.04 LTSsamba`pkg:deb/ubuntu/samba?arch=source&distro=esm-infra/bionic`Other threats	Affected 2:4.6.7+dfsg-1ubuntu3 – 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3 32 affected builds	Fixed in–
Ubuntu Pro 16.04 LTSsamba`pkg:deb/ubuntu/samba?arch=source&distro=esm-infra/xenial`Other threats	Affected 2:4.1.17+dfsg-4ubuntu2 – 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4 46 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

TSIG packet with name compression can crash DNS. Incorrect size calculations when a TSIG record contains compressed names can lead to a large out-of-bounds write causing the server to crash.

References

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