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Advisory record · GHSA-2wc2-fm75-p42x

Soup Sieve has Memory Exhaustion via Large Comma-Separated Selector Lists

CVSS 7.5 HighEPSS 0.0064 · 51st percentile

Published by the GitHub Advisory Database at 9 Jul 2026, 13:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
soupsievePyPI<2.8.42.8.4
Identifiers
GHSA-2wc2-fm75-p42x · CVE-2026-49476 · PYSEC-2026-3071
Weakness (CWE)
CWE-400 · CWE-770
Tags
Published
9 Jul 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Soupsieve versions before 2.8.4 are vulnerable to memory exhaustion when compiling CSS selector lists with a very large number of comma-separated items. An attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup's select functions, with no authentication needed, can cause the application to allocate large amounts of memory and crash or degrade. Upgrade soupsieve to version 2.8.4 or later.

Written 4 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0064, the 51st percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:29 UTC First seen by agentprime
  2. 31 Oct 2026, 14:29 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.