CVE-2026-14266

high

Published 2026-07-29 · Modified 2026-07-29

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CVSS v3

7.0

CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v4 NEW

—

not yet in upstream

VIR risk

7.0

Description

7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the processing of XZ chunked data. Crafted XZ-compressed data can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-30169.

Predictions

Exploit likelihood

69%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-14266 NameCVE-2026-14266 SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) Debian Bugs1142293 Vulnerable and fixed packages The table below lists information on source packages. Source PackageReleaseVersionStatus 7zip (PTS)bookworm22.01+really26.01+dfsg-0+deb12u1vulnerable…

CVE-2026-14266

Name	CVE-2026-14266
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1142293

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
7zip (PTS)	bookworm	22.01+really26.01+dfsg-0+deb12u1	vulnerable
	trixie	25.01+dfsg-1~deb13u2	vulnerable
	forky, sid	26.02+dfsg-2	fixed
p7zip (PTS)	bullseye	16.02+dfsg-8	vulnerable
	bullseye (security)	16.02+really26.01+dfsg-0+deb11u1	vulnerable
	bookworm	16.02+really26.01+dfsg-0+deb12u1	vulnerable
	trixie	16.02+transitional.1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
7zip	source	(unstable)	26.02+dfsg-1			1142293
p7zip	source	(unstable)	16.02+transitional.1

Notes

[bookworm] - p7zip <postponed> (Wait for 7zip-26.02/trixie SPU approval, then backport)
[bullseye] - p7zip <postponed> (Wait for 7zip-26.02/trixie SPU approval, then backport)
Since p7zip/16.02+transitional.1 src:p7zip is only an empty source package
depending on 7zip. Mark this version as fixed version.
https://www.zerodayinitiative.com/advisories/ZDI-26-444/

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

[bookworm] - p7zip <postponed> (Wait for 7zip-26.02/trixie SPU approval, then backport)[bullseye] - p7zip <postponed> (Wait for 7zip-26.02/trixie SPU approval, then backport)Since p7zip/16.02+transitional.1 src:p7zip is only an empty source packagedepending on 7zip. Mark this version as fixed version.https://www.zerodayinitiative.com/advisories/ZDI-26-444/

OS impact

Debian Mixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`16.02+transitional.1`
sid	Fixed	`26.02+dfsg-1`
forky	Fixed	`26.02+dfsg-1`
bullseye	Affected	—
bookworm	Affected	—

References

CWEs

CWE-122

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.