CVE-2026-48101

Name	CVE-2026-48101
Description	7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
7zip (PTS)	bookworm	22.01+really25.01+dfsg-0+deb12u1	vulnerable
	trixie	25.01+dfsg-1~deb13u2	vulnerable
	forky, sid	26.01+dfsg-2	fixed
p7zip (PTS)	bullseye	16.02+dfsg-8	vulnerable
	bullseye (security)	16.02+really25.01+dfsg-0+deb11u1	vulnerable
	bookworm	16.02+really25.01+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)	26.01+dfsg-1	unimportant
p7zip	source	(unstable)	16.02+transitional.1	unimportant

Notes

Since p7zip/16.02+transitional.1 src:p7zip is only a empty source package
depending on 7zip. Mark this version as fixed version.
https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/
Crash in CLI tool, no security impact