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ruby_parser allows local users to overwrite arbitrary files via symlink attack on temporary file with predictable name

CVE-2013-0162GHSA-8mvw-22r7-w6fq

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (ruby_parser 3.1.2), 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.

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Affected packages

  • RubyGems ruby_parser

    Affected
    >= 2.0.2, < 3.1.2
    Fixed in
    3.1.2

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
  • CVE-2013-0162: 0.37% estimated exploitation activity in the next 30 days; percentile 31.12 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

The diffpp function in lib/gauntletrubyparser.rb in the rubyparser gem 3.1.1 and earlier for Ruby allows local users to overwrite arbitrary files via a symlink attack on a temporary file with a predictable name in /tmp.

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

    Published from ghsa record GHSA-8mvw-22r7-w6fq

Agent brief

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

# Patch Next advisory brief: CVE-2013-0162

Advisory: ruby_parser allows local users to overwrite arbitrary files via symlink attack on temporary file with predictable name
IDs: CVE-2013-0162, GHSA-8mvw-22r7-w6fq
Record: https://patchnext.com/advisories/cve-2013-0162 (revision 1, source checked 26 Oct 2026, 15:47 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: ruby_parser 3.1.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems ruby_parser: affected >= 2.0.2, < 3.1.2; fixed in 3.1.2

## Suggested inspection (read-only)
- RubyGems ruby_parser: 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 ruby_parser.
- 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-8mvw-22r7-w6fq (GitHub-reviewed advisory GHSA-8mvw-22r7-w6fq lists affected ranges: RubyGems ruby_parser >=2.0.2 <3.1.2)

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