Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
High, CVSS 7.5

Out-of-bounds Write in zlib affects Nokogiri

GHSA-v6gp-9mmm-c6p5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (nokogiri 1.13.4), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

Add to your agent

Affected packages

  • RubyGems nokogiri

    Affected
    < 1.13.4
    Fixed in
    1.13.4

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary Nokogiri v1.13.4 updates the vendored zlib from 1.2.11 to 1.2.12, which addresses CVE-2018-25032. That CVE is scored as CVSS 7.4 "High" on the NVD record as of 2022-04-05. Please note that this advisory only applies to the CRuby implementation of Nokogiri < 1.13.4, and only if the packaged version of zlib is being used. Please see this document for a complete description of which platform gems vendor zlib. If you've overridden defaults at installation time to use system libraries instead of packaged libraries, you should instead pay attention to your distro's zlib release announcements. Mitigation Upgrade to Nokogiri = v1.13.4. Impact CVE-2018-25032 in zlib - Severity: High - Type: CWE-787 Out of bounds write - Description: zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-v6gp-9mmm-c6p5

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-v6gp-9mmm-c6p5

Advisory: Out-of-bounds Write in zlib affects Nokogiri
IDs: GHSA-v6gp-9mmm-c6p5
Record: https://patchnext.com/advisories/ghsa-v6gp-9mmm-c6p5 (revision 1, source checked 26 Oct 2026, 15:43 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: nokogiri 1.13.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems nokogiri: affected < 1.13.4; fixed in 1.13.4

## Suggested inspection (read-only)
- RubyGems nokogiri: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on nokogiri.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-v6gp-9mmm-c6p5 (GitHub-reviewed advisory GHSA-v6gp-9mmm-c6p5 lists affected ranges: RubyGems nokogiri >=0 <1.13.4)

Commands are suggestions: review each one before running it.

Loading voting…