CVE-2026-49476 Details
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.
A denial-of-service vulnerability has been identified in Soup Sieve, a CSS selector library for Beautiful Soup 4, in versions prior to 2.8.4. The issue arises because the CSS selector parser can allocate unbounded memory when processing large, comma-separated selector lists. This flaw allows an attacker to cause significant memory exhaustion by supplying a crafted selector string, leading to application-level denial-of-service.
Users can upgrade to Soup Sieve version 2.8.4 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x | CISA-ADP | ExploitVendor Advisory |
| https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39 | [email protected] | Patch |
| https://github.com/facelessuser/soupsieve/releases/tag/2.8.4 | [email protected] | Release Notes |
| https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| facelessuser soup sieve | < 2.8.4 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 28, 2026 | Initial Analysis | [email protected] |
| Jul 15, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | New CVE Received | [email protected] |