Medium severity5.7NVD Advisory· Published Apr 9, 2026· Updated Apr 20, 2026
CVE-2026-34944
CVE-2026-34944
Description
Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, On x86-64 platforms with SSE3 disabled Wasmtime's compilation of the f64x2.splat WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but this data is not visible to WebAssembly guests. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
wasmtimecrates.io | < 24.0.7 | 24.0.7 |
wasmtimecrates.io | >= 25.0.0, < 36.0.7 | 36.0.7 |
wasmtimecrates.io | >= 37.0.0, < 42.0.2 | 42.0.2 |
wasmtimecrates.io | >= 43.0.0, < 43.0.1 | 43.0.1 |
Affected products
10- osv-coords9 versionspkg:apk/chainguard/wasmcloudpkg:apk/chainguard/wizerpkg:apk/chainguard/yara-xpkg:apk/chainguard/zedpkg:apk/wolfi/wasmcloudpkg:apk/wolfi/wizerpkg:apk/wolfi/yara-xpkg:apk/wolfi/zedpkg:cargo/wasmtime
< 2.0.4-r0+ 8 more
- (no CPE)range: < 2.0.4-r0
- (no CPE)range: < 11.0.3-r10
- (no CPE)range: < 1.15.0-r2
- (no CPE)range: < 0.228.0-r3
- (no CPE)range: < 2.0.4-r0
- (no CPE)range: < 11.0.3-r10
- (no CPE)range: < 1.15.0-r2
- (no CPE)range: < 0.228.0-r3
- (no CPE)range: < 24.0.7
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-qqfj-4vcm-26hvghsaADVISORY
- github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qqfj-4vcm-26hvnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-34944ghsaADVISORY
- rustsec.org/advisories/RUSTSEC-2026-0087.htmlghsaWEB
News mentions
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