Bug 2500752 (CVE-2026-49477) - CVE-2026-49477 soupsieve: Soupsieve: Denial of Service via crafted CSS selector strings
Summary: CVE-2026-49477 soupsieve: Soupsieve: Denial of Service via crafted CSS select...
Keywords:
Status: NEW
Alias: CVE-2026-49477
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-14 22:04 UTC by OSIDB Bzimport
Modified: 2026-07-17 15:59 UTC (History)
37 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-07-14 22:04:45 UTC 
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.
Note You need to log in before you can comment on or make changes to this bug.