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Advisory record · GHSA-jc36-42cf-vqwj

Nokogiri affected by zlib's Out-of-bounds Write vulnerability

CVSS 7.5 HighCriticalEPSS 0.52 · 98th percentile

Critical, because:

  • CVSS score 7.5 (7.0 or more) and EPSS 0.52 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 26 Mar 2022, 00:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
nokogiriRubyGems<1.13.41.13.4
Identifiers
GHSA-jc36-42cf-vqwj · CVE-2018-25032 · PSF-2022-3
Weakness (CWE)
CWE-787
Tags
Published
26 Mar 2022
Updated
10 Sept 2026

Machine-written summary

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

Nokogiri versions before 1.13.4 are affected by a memory corruption flaw inherited from the bundled zlib library (version 1.2.11). The flaw occurs when deflating, meaning compressing, input that contains many distant matches. The source gives few details about how an attacker would trigger it or what impact results. Upgrade Nokogiri to version 1.13.4 or later.

Written 8 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 GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.52, the 98th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:16 UTC First seen by agentprime
  2. 31 Oct 2026, 15:16 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.