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Advisory record · GHSA-mghf-wjfp-p5xm

Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction

CVSS 9.9 CriticalCriticalEPSS 0.0099 · 62nd percentile

Critical, because:

  • CVSS score 9.9: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 28 Oct 2026, 21:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
wasmtimecrates.io<36.0.19 || >=37.0.0, <48.0.7 || >=49.0.0, <49.0.436.0.19, 48.0.7, 49.0.4
Identifiers
GHSA-mghf-wjfp-p5xm · CVE-2026-115893 · RUSTSEC-2026-0379
Weakness (CWE)
CWE-691
Tags
Published
28 Oct 2026
Updated
28 Oct 2026

Machine-written summary

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

Wasmtime, when built with the Cranelift backend on aarch64, is affected in versions before 36.0.19, from 37.0.0 before 48.0.7, and from 49.0.0 before 49.0.4. A Wasm module containing a single br_table instruction with more than about 256k targets can be compiled into an incorrect branch target, so a malicious module can redirect execution to other code and escape the sandbox. Users should upgrade to 36.0.19, 48.0.7, or 49.0.4, depending on their 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
9.9 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0099, the 62nd 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.