CVE-2026-93894

Name	CVE-2026-93894
Description	In Vinyl Cache before 9.0,2, workspace buffer overflow vulnerability was found in the .upper() and .lower() string type methods of VCL. This can be used as a remote denial of service (DoS) vector to make the child process segfault or assert, and then restart. Effectively exploiting this vulnerability requires prior knowledge about the VCL in use and the ability to craft a request that contains a string that is long enough to fill the remaining workspace at the call site while staying under the different request size limits (http_req_size, http_req_hdr_len, etc.).
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	1148187

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
varnish (PTS)	bookworm, bookworm (security)	7.1.1-2+deb12u1	vulnerable
	trixie (security), trixie	7.7.0-3+deb13u1	vulnerable
vinyl-cache (PTS)	forky, sid	9.0.1-4	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
varnish	source	(unstable)	(unfixed)
vinyl-cache	source	(unstable)	(unfixed)			1148187

Notes

https://vinyl-cache.org/security/VSV00020.html
Fixed by: https://code.vinyl-cache.org/vinyl-cache/vinyl-cache/commit/90f5bacc14b2404e6cc349ba015f0f73b8515136 (vinyl-cache-9.1.0)
Fixed by: https://code.vinyl-cache.org/vinyl-cache/vinyl-cache/commit/853d397f30753bce1587991fcf9193c63fb4d1eb (vinyl-cache-9.0.2)