CVE-2026-49476

Name	CVE-2026-49476
Description	Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup .select() / .select_one() to allocate hundreds of megabytes of heap memory from a relatively small input and cause denial of service. This issue is fixed in version 2.8.4.
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
soupsieve (PTS)	bullseye	2.2.1-1	vulnerable
	bookworm	2.3.2-1	vulnerable
	trixie	2.7-1	vulnerable
	forky, sid	2.8.4-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
soupsieve	source	(unstable)	2.8.4-1

Notes

https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x
Fixed by: https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39 (2.8.4)