CVE-2026-16517

Name	CVE-2026-16517
Description	A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.
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	1142834

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libarchive (PTS)	bullseye	3.4.3-2+deb11u1	vulnerable
	bullseye (security)	3.4.3-2+deb11u4	vulnerable
	bookworm	3.6.2-1+deb12u4	vulnerable
	bookworm (security)	3.6.2-1+deb12u2	vulnerable
	trixie	3.7.4-4+deb13u1	vulnerable
	forky, sid	3.8.9-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libarchive	source	(unstable)	3.8.9-1			1142834

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2505492
https://github.com/libarchive/libarchive/issues/3225
https://github.com/libarchive/libarchive/pull/3228
Fixed by: https://github.com/libarchive/libarchive/commit/1c6e7b491f60fce335c20a9692f870d1f1ca39aa
Fixed by: https://github.com/libarchive/libarchive/commit/4bb52f4934113059cfa23a2375f3bad9f124ff90 (v3.8.9)