CVE-2026-49476 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-49476HIGH

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0052   42.1     —

AFFECTED
  Product    Versions   Fixed
  soupsieve  < 2.8.4 –  —

TIMELINE
  May 30  Reserved by GitHub_M
  Jul 14  EXPLOIT PUBLISHED — CVE-2026-49476 (facelessuser soupsieve). Public exploit reference added.
  Jul 14  Published (CNA: GitHub_M)

CWE-400, CWE-770 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 30, 2026	Reserved	Reserved by GitHub_M
July 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-49476 (facelessuser soupsieve). Public exploit reference added.
July 14, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
facelessuser	soupsieve	—	< 2.8.4	—

Weaknesses

CWE-400 · CWE-770

References (3)

https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39 [Patch]
https://github.com/facelessuser/soupsieve/releases/tag/2.8.4 [Release Notes]
https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-49476 at cve.org

Vendors: facelessuser

Weaknesses: CWE-400 · CWE-770

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-49476 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.