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Advisory record · GHSA-2jx3-ff3v-j7jj

yara-x: Unvalidated deserialization in safe `Rules::deserialize` allows memory corruption and UB

CVSS 4.0, no score published

Published by the GitHub Advisory Database at 24 Sept 2026, 19:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
yara-xcrates.io<1.19.01.19.0
Identifiers
GHSA-2jx3-ff3v-j7jj
Weakness (CWE)
CWE-502
Tags
Published
24 Sept 2026
Updated
24 Sept 2026

Machine-written summary

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

The yara-x crate, versions before 1.19.0, has a public safe function, Rules::deserialize, that accepts arbitrary bytes and does not validate the decoded structures. An attacker who can supply serialized rule data to this function can trigger out-of-bounds reads and invalid UTF-8 handling during later scanning, which is undefined behavior. Upgrade to yara-x 1.19.0 or later, which contains the fix. Do not pass untrusted bytes to Rules::deserialize in earlier versions.

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
Not published None 4.0 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 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.