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  4. CVE 2026 115892 wasmtime panic lowering a host created component
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Back to active CVEs
Medium ยท CVSS 5.7CVE-2026-115892GHSA-9PVW-HWFG-92H5

Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload typeCVE-2026-115892

Answer in brief

CVE-2026-115892 records a Medium severity (CVSS 5.7) vulnerability in Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type. 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
Medium ยท CVSS 5.7
Exploitation
Not marked as known exploited
Affected software
6 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.7. 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>=46.0.0 <48.0.7 >=49.0.0 <49.0.448.0.7, 49.0.4
wasmtimecrates.io>=46.0.0 <48.0.748.0.7
wasmtimecrates.io>=49.0.0 <49.0.449.0.4
bytecodealliance/wasmtimegeneric>=46.0.0 <48.0.7 || >=49.0.0 <49.0.448.0.7, 49.0.4
wasmtimerust>=46.0.0,<48.0.748.0.7
wasmtimerust>=49.0.0,<49.0.449.0.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for wasmtime, wasmtime, wasmtime.
  2. 2Review the reported fix. Update wasmtime to 48.0.7; wasmtime to 48.0.7; wasmtime to 49.0.4; bytecodealliance/wasmtime to 48.0.7; wasmtime to 48.0.7; wasmtime to 49.0.4 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
  • 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. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or an equivalent typed reader. A malicious guest that controls exported function types or returned values can cause the host to pass the type-erased value to a guest expecting a different payload type, which panics the Wasmtime host. This issue is fixed in versions 48.0.7 and 49.0.4.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilationSame 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-843, CWE-248
Source
CVE List V5
Source checked
Oct 23, 2026
References
13 linked sources
Open source record