CVE-2026-126191
HIGH
MEDIUM
Priority: 0.03
BB Relevance:
75/100
Published: 2026-11-12
Modified: 2026-11-13
First seen: 2026-11-12
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
Description
Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 3.0, the CSS_ESCAPES and IDENTIFIER regular-expression subpatterns can backtrack exponentially on runs of ambiguous digit escapes in an attribute-name or tag position of an otherwise valid selector. The failure occurs during selector compilation through soupsieve.compile() or Beautiful Soup select() before SELECTOR_LIMIT is applied, so an application that accepts untrusted selector strings can have a worker stalled by a short input. This issue is fixed in version 3.0.
Weakness Classification (1)
Affected Software (2)
| Vendor | Product | Version |
|---|---|---|
| facelessuser | soupsieve | < 3.0 |
| facelessuser | soupsieve | < 3.0 |