Vulnerability details

CVE-2026-49476

facelessuser soupsieve

Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve

CVSS 3.1

7.5High

Official 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.

CVSS scores

Score	Version	Source	Vector
7.5High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
facelessuser	soupsieve	< 2.8.4	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39 x_refsource_MISC
https://github.com/facelessuser/soupsieve/releases/tag/2.8.4 x_refsource_MISC
https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x x_refsource_CONFIRM

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Details

Published: 2026-07-15
Last updated: 2026-07-15
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.64%

Probability of exploitation in 30 days

51.1%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-400
Uncontrolled Resource Consumption
CWE-770
Allocation of Resources Without Limits or Throttling