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Details of issue NIXPKGS-2026-2203

NIXPKGS-2026-2203
published 1 week, 1 day ago
Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve
Permalink CVE-2026-49476
7.5 HIGH
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): None (N)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): High (H)
updated 1 week, 1 day ago by @LeSuisse Activity log
  • Created suggestion 1 week, 2 days ago
  • @LeSuisse accepted 1 week, 1 day ago
  • @LeSuisse published on GitHub 1 week, 1 day ago
Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve

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.

Affected products

soupsieve
  • ==< 2.8.4

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