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Advisory record · GHSA-9jh8-v38h-cvhr

ammonia: mXSS via MathML `annotation-xml` encoding strip

CVSS 6.3 MediumEPSS 0.0056 · 46th percentile

Published by the GitHub Advisory Database at 22 Oct 2026, 14:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
ammoniacrates.io<3.3.2 || >=4.0.0, <4.0.2 || >=4.1.0, <4.1.33.3.2, 4.0.2, 4.1.3
Identifiers
GHSA-9jh8-v38h-cvhr · CVE-2026-63430 · RUSTSEC-2026-0193
Weakness (CWE)
CWE-79
Tags
Published
22 Oct 2026
Updated
22 Oct 2026

Machine-written summary

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

ammonia versions before 3.3.2, from 4.0.0 before 4.0.2, and from 4.1.0 before 4.1.3 are affected. If an application allows the math and annotation-xml tags but not the encoding attribute, and also allows a raw-text tag such as style, an attacker can inject JavaScript into a user's browser. Upgrade to 3.3.2, 4.0.2, or 4.1.3.

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:N/SC:L/SI:L/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0056, the 46th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

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.