Technology · Bytecodealliance
Bytecodealliance Wasmtime vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 12 vulnerabilities in Bytecodealliance Wasmtime: 0 in the last 7 days and 0 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-35195, was published on 9 April 2026.
- Last 7 days
- 0
- Last 90 days
- 0
- Critical, all time
- 1
- Exploited in the wild
- 0
About Bytecodealliance Wasmtime
Runtime for executing WebAssembly modules outside of web browsers.
Latest Bytecodealliance Wasmtime vulnerabilities
- CVE-2026-35195: Bytecode Alliance Wasmtime out-of-bounds write in string transcodingmediumCVSS 5.4EPSS 0.2%
- CVE-2026-35186: Bytecode Alliance Wasmtime out-of-bounds access in Winch compilerhighCVSS 7.5EPSS 0.2%
- CVE-2026-34988: Bytecode Alliance Wasmtime data leakage in pooling allocatormediumCVSS 6.3EPSS 0.3%
- CVE-2026-34987: Bytecode Alliance Wasmtime sandbox escape in Winch compiler backendcriticalCVSS 9.9EPSS 0.3%
- CVE-2026-34983: Bytecode Alliance Wasmtime use-after-free in Linker cloningmediumCVSS 5EPSS 0.1%
- CVE-2026-34946: Wasmtime has host panic when Winch compiler executes `table.fill`highCVSS 7.5EPSS 0.4%
- CVE-2026-34945: Wasmtime has host data leakage with 64-bit tables and WinchmediumCVSS 6.5EPSS 0.3%
- CVE-2026-34944: Wasmtime segfault or unused out-of-sandbox load with `f64x2.splat` operator on x86-64mediumCVSS 5.7EPSS 0.2%
- CVE-2026-34943: Wasmtime has a possible panic when lifting `flags` component valuehighCVSS 7.5EPSS 0.3%
- CVE-2026-34942: Wasmtime: Panic when transcoding misaligned utf-16 stringsmediumCVSS 6.5EPSS 0.4%
- CVE-2026-34941: Wasmtime: Heap OOB read in component model UTF-16 to latin1+utf16 string transcodinghighCVSS 8.1EPSS 0.4%
- CVE-2025-62711: RUSTSEC-2025-0112 - Possible host crash with host-to-wasm component intrinsicsmediumCVSS 4EPSS 0.4%
Most severe Bytecodealliance Wasmtime vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-34987: Bytecode Alliance Wasmtime sandbox escape in Winch compiler backendcriticalCVSS 9.9EPSS 0.3%
- CVE-2026-34941: Wasmtime: Heap OOB read in component model UTF-16 to latin1+utf16 string transcodinghighCVSS 8.1EPSS 0.4%
- CVE-2026-34946: Wasmtime has host panic when Winch compiler executes `table.fill`highCVSS 7.5EPSS 0.4%
- CVE-2026-34943: Wasmtime has a possible panic when lifting `flags` component valuehighCVSS 7.5EPSS 0.3%
- CVE-2026-35186: Bytecode Alliance Wasmtime out-of-bounds access in Winch compilerhighCVSS 7.5EPSS 0.2%
- CVE-2026-34942: Wasmtime: Panic when transcoding misaligned utf-16 stringsmediumCVSS 6.5EPSS 0.4%
- CVE-2026-34945: Wasmtime has host data leakage with 64-bit tables and WinchmediumCVSS 6.5EPSS 0.3%
- CVE-2026-34988: Bytecode Alliance Wasmtime data leakage in pooling allocatormediumCVSS 6.3EPSS 0.3%
- CVE-2026-34944: Wasmtime segfault or unused out-of-sandbox load with `f64x2.splat` operator on x86-64mediumCVSS 5.7EPSS 0.2%
- CVE-2026-35195: Bytecode Alliance Wasmtime out-of-bounds write in string transcodingmediumCVSS 5.4EPSS 0.2%
Vulnerabilities per week
Nothing was published in the last eight weeks. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Bytecodealliance Wasmtime vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/bytecodealliance-wasmtime)<a href="https://junglewise.ai/threats/technologies/bytecodealliance-wasmtime"><img src="https://junglewise.ai/threats/technologies/bytecodealliance-wasmtime/badge.svg" alt="Bytecodealliance Wasmtime vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/bytecodealliance-wasmtime.json, and this page as text at https://junglewise.ai/threats/technologies/bytecodealliance-wasmtime.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Bytecodealliance Wasmtime vulnerabilities", https://junglewise.ai/threats/technologies/bytecodealliance-wasmtime, 9 November 2026.