CVE-2026-66485

Name	CVE-2026-66485
Description	GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c. The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial of service. This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9
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	1144387

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
cpio (PTS)	bullseye	2.13+dfsg-7.1~deb11u1	vulnerable
	bookworm	2.13+dfsg-7.1	vulnerable
	trixie	2.15+dfsg-2	vulnerable
	forky, sid	2.15+dfsg-2.1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
cpio	source	(unstable)	(unfixed)			1144387

Notes

[trixie] - cpio <no-dsa> (Minor issue)
[bookworm] - cpio <postponed> (Minor issue)
[bullseye] - cpio <postponed> (Minor issue)
https://cert.pl/en/posts/2026/08/CVE-2026-66484
Fixed by: https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=3cd514031371d8aeeaf2048aa10103e02831aaa9