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Advisory record · GHSA-jxhv-7h78-9775

Panic when transcoding misaligned component model UTF-16 strings

CVSS 5.9 MediumEPSS 0.0037 · 30th percentile

Published by the GitHub Advisory Database at 9 Apr 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
wasmtimecrates.io>=0.0.0-0, <24.0.7 || >=25.0.0, <36.0.7 || >=37.0.0, <42.0.2 || >=43.0.0, <43.0.124.0.7, 36.0.7, 42.0.2, 43.0.1
Identifiers
GHSA-jxhv-7h78-9775 · CVE-2026-34942 · RUSTSEC-2026-0092
Weakness (CWE)
CWE-129
Tags
Published
9 Apr 2026
Updated
12 Oct 2026

Machine-written summary

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

Wasmtime versions before 24.0.7, from 25.0.0 before 36.0.7, from 37.0.0 before 42.0.2, and 43.0.0 are affected. The advisory concerns a panic when transcoding misaligned component model UTF-16 strings, but the source gives few details on who can trigger it or what else is possible. Upgrade to 24.0.7, 36.0.7, 42.0.2, or 43.0.1 depending on your release line.

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
5.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 30th percentile, on 6 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.