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.
Severity (CVSS)
| Base score | 7.5 |
|---|---|
| Severity | High |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Provided by | CNA |
Weaknesses
- CWE-400 — CWE-400: Uncontrolled Resource Consumption
- CWE-770 — CWE-770: Allocation of Resources Without Limits or Throttling
Affected products
| Vendor | Product | Versions |
|---|---|---|
| facelessuser | soupsieve | < 2.8.4 |
References
- https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x (x_refsource_CONFIRM)
- https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39 (x_refsource_MISC)
- https://github.com/facelessuser/soupsieve/releases/tag/2.8.4 (x_refsource_MISC)
Generated from the official CVE List on 15 Jul 2026 07:06 UTC.