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Advisory record · GHSA-6jxj-px6v-747w

Crass: Deeply nested CSS blocks and functions can trigger a SystemStackError or excessive memory usage

CVSS 6.3 MediumEPSS 0.0049 · 41st percentile

Published by the GitHub Advisory Database at 29 Oct 2026, 16:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
crassRubyGems<1.0.71.0.7
Identifiers
GHSA-6jxj-px6v-747w · CVE-2026-61846
Weakness (CWE)
CWE-400 · CWE-674
Tags
Published
29 Oct 2026
Updated
29 Oct 2026

Machine-written summary

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

Crass versions before 1.0.7 are vulnerable to deeply nested CSS blocks and functions, which can cause a SystemStackError or excessive memory use. An attacker who can supply CSS content to be parsed can trigger this. Upgrade crass to version 1.0.7, which adds a configurable depth limit. The source does not offer a workaround beyond rescuing SystemStackError or adding memory.

Written 3 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
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0049, the 41st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 30 Oct 2026, 18:43 UTC Confirmed by the CVE List
  2. 30 Oct 2026, 19:18 UTC Confirmed by NVD
  3. 31 Oct 2026, 14:21 UTC First seen by agentprime
  4. 31 Oct 2026, 14:21 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.