soupsieve: Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4
CVE-2026-49477 is fixed in 2 products on 1 platform, first by SUSE-SU-2026:22660-1, released July 14, 2026. It is not reported as exploited. Patch Radar priority: High.
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 contains a regular expression vulnerable to catastrophic backtracking when processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select() / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-soupsieve · opensuse-leap 16.0 | 2.6-160000.4.1 | OPENSUSE-SU-2026:21342-1 | Jul 14, 2026 |
| python-soupsieve · sles 15.6 | 2.5-150600.3.3.1 | SUSE-SU-2026:3240-1 | Jul 24, 2026 |
| python-soupsieve · sles 15.7 | 2.5-150600.3.3.1 | SUSE-SU-2026:3240-1 | Jul 24, 2026 |
| python-soupsieve · sles 16.0 | 2.6-160000.4.1 | SUSE-SU-2026:22660-1 | Jul 14, 2026 |
| soupsieve · Debian 14 | 2.8.4-1 | DEBIAN-CVE-2026-49477 | Jul 18, 2026 |
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