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  4. CVE 2026 115889 wasmtime bit packing in cranelift compiler causes
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Back to active CVEs
Critical · CVSS 9.9CVE-2026-115889GHSA-897F-G5GM-FMXM

Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilationCVE-2026-115889

Answer in brief

CVE-2026-115889 records a Critical severity (CVSS 9.9) vulnerability in Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation. The current sources do not mark it as known exploited. The current feed maps wasmtime (crates.io), wasmtime (crates.io), wasmtime (crates.io), bytecodealliance/wasmtime (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 23, 2026Updated Oct 23, 2026Source checked Oct 23, 2026First seen by HOL Oct 20, 2026Material review Oct 23, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.9
Exploitation
Not marked as known exploited
Affected software
6 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps wasmtime (crates.io), wasmtime (crates.io), wasmtime (crates.io), bytecodealliance/wasmtime (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
wasmtimecrates.io>=0.0.0-0 <36.0.19 >=37.0.0 <43.0.036.0.19, 43.0.0
wasmtimecrates.io>=0 <36.0.1936.0.19
wasmtimecrates.io>=37.0.0 <43.0.043.0.0
bytecodealliance/wasmtimegeneric<36.0.19 || >=37.0.0 <43.0.036.0.19, 43.0.0
wasmtimerust<36.0.1936.0.19
wasmtimerust>=37.0.0,<43.0.043.0.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for wasmtime, wasmtime, wasmtime.
  2. 2Review the reported fix. Update wasmtime to 36.0.19; wasmtime to 36.0.19; wasmtime to 43.0.0; bytecodealliance/wasmtime to 36.0.19; wasmtime to 36.0.19; wasmtime to 43.0.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 20, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencerustsec.org
  • Source referencecrates.io
  • GitHub security advisorygithub.com
Upstream source description

Wasmtime is a runtime for WebAssembly. Prior to 36.0.19 and 43.0.0, the Cranelift compiler backend bit-packs SSA value indices in a way that can silently overflow in release builds when compiling a sufficiently large or specially crafted Wasm function with many SSA values. The overflow can make Cranelift reference incorrect IR values, causing arbitrary miscompilation, type confusion, and other attacker-controlled effects that may escape the Wasm sandbox on any architecture using the default Cranelift backend. This issue is fixed in versions 36.0.19 and 43.0.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload typeSame wasmtime package
  • Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instructionSame bytecodealliance/wasmtime package
  • Tokio: Race condition in `tokio::time::Interval`Same crates.io ecosystem
  • Fallow: Jest and Vitest `projects` entries let an analyzed repository make Fallow read files outside the project rootSame crates.io ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-197, CWE-843
Source
CVE List V5
Source checked
Oct 23, 2026
References
11 linked sources
Open source record