CVE-2026-34987
wasmtime: bytecodealliance/wasmtime: Wasmtime: Arbitrary code execution via incorrect memory offset handling in Winch compiler
Sévérité par source
Le label propre à Trivy est CRITICAL. Critique selon NVD, GHSA, Julia. Plus basse selon Red Hat (élevée).
Description
Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime with its Winch (baseline) non-default compiler backend may allow properly constructed guest Wasm to access host memory outside of its linear-memory sandbox. This vulnerability requires use of the Winch compiler (-Ccompiler=winch). By default, Wasmtime uses its Cranelift backend, not Winch. With Winch, the same incorrect assumption is present in theory on both aarch64 and x86-64. The aarch64 case has an observed-working proof of concept, while the x86-64 case is theoretical and may not be reachable in practice. This Winch compiler bug can allow the Wasm guest to access memory before or after the linear-memory region, independently of whether pre- or post-guard regions are configured. The accessible range in the initial bug proof-of-concept is up to 32KiB before the start of memory, or ~4GiB after the start of memory, independently of the size of pre- or post-guard regions or the use of explicit or guard-region-based bounds checking. However, the underlying bug assumes a 32-bit memory offset stored in a 64-bit register has its upper bits cleared when it may not, and so closely related variants of the initial proof-of-concept may be able to access truly arbitrary memory in-process. This could result in a host process segmentation fault (DoS), an arbitrary data leak from the host process, or with a write, potentially an arbitrary RCE. This vulnerability is fixed in 36.0.7, 42.0.2, and 43.0.1.
Paquets affectés et versions corrigées
| Source | Paquet | Corrigé en |
|---|---|---|
| cargo::GitHub Security Advisory Rust | wasmtime | 36.0.7, 42.0.2, 43.0.1 |
| julia::Julia Ecosystem Security Advisories | Wasmtime_jll | 45.0.1+0 |
| chainguard | wasmcloud, wizer, yara-x et 1 autres | 2.0.4-r0 et 3 autres |
| debian 13 | rust-wasmtime | pas de correctif indiqué |
| debian 14 | rust-wasmtime | 36.0.7+dfsg-1 |
| echo | rust-wasmtime | pas de correctif indiqué |
| rapidfort debian 12 | rust-wasmtime | 0:36.0.7+dfsg-1 |
| rapidfort debian 13 | rust-wasmtime | 0:36.0.7+dfsg-1 |
| wolfi | wasmcloud, wizer, yara-x et 1 autres | 2.0.4-r0 et 3 autres |
Afficher les 15 entrées de 9 sources
| Source | Paquet | Corrigé en |
|---|---|---|
| cargo::GitHub Security Advisory Rust | wasmtime | 36.0.7, 42.0.2, 43.0.1 |
| julia::Julia Ecosystem Security Advisories | Wasmtime_jll | 45.0.1+0 |
| chainguard | wasmcloud | 2.0.4-r0 |
| chainguard | wizer | 11.0.3-r10 |
| chainguard | yara-x | 1.15.0-r2 |
| chainguard | zed | 0.228.0-r3 |
| debian 13 | rust-wasmtime | pas de correctif indiqué |
| debian 14 | rust-wasmtime | 36.0.7+dfsg-1 |
| echo | rust-wasmtime | pas de correctif indiqué |
| rapidfort debian 12 | rust-wasmtime | 0:36.0.7+dfsg-1 |
| rapidfort debian 13 | rust-wasmtime | 0:36.0.7+dfsg-1 |
| wolfi | wasmcloud | 2.0.4-r0 |
| wolfi | wizer | 11.0.3-r10 |
| wolfi | yara-x | 1.15.0-r2 |
| wolfi | zed | 0.228.0-r3 |
Références
- https://access.redhat.com/security/cve/CVE-2026-34987
- https://github.com/advisories/GHSA-xx5w-cvp6-jv83
- https://github.com/bytecodealliance/wasmtime
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xx5w-cvp6-jv83
- https://nvd.nist.gov/vuln/detail/CVE-2026-34987
- https://rustsec.org/advisories/RUSTSEC-2026-0095.html
- https://www.cve.org/CVERecord?id=CVE-2026-34987