Technology · Bytecode Alliance
Bytecode Alliance Wasmtime-Wasi vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 5 vulnerabilities in Bytecode Alliance Wasmtime-Wasi: 0 in the last 7 days and 3 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, Wasmtime-WASI filesystem sandbox escape with symlink rename, was published on 14 October 2026. 1 vulnerability in the last four weeks, down 50% on the four before (2).
- Last 7 days
- 0
- Last 90 days
- 3
- Critical, all time
- 0
- Exploited in the wild
- 0
About Bytecode Alliance Wasmtime-Wasi
WebAssembly runtime component providing WASI (WebAssembly System Interface) functionality for wasmtime.
Latest Bytecode Alliance Wasmtime-Wasi vulnerabilities
- Wasmtime-WASI filesystem sandbox escape with symlink renamemediumCVSS 4
- wasmtime-wasi excessive memory allocation when guests lack stdiomediumCVSS 4
- Wasmtime wasmtime-wasi fd_readdir information disclosuremediumCVSS 4
- CVE-2026-54786: Bytecode Alliance Wasmtime resource leak in WASIp1 fd_renumbermediumCVSS 5EPSS 0.4%
- CVE-2026-47261: Bytecode Alliance Wasmtime access control bypass in wasmtime-wasihighCVSS 7.5EPSS 0.5%
Most severe Bytecode Alliance Wasmtime-Wasi vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-47261: Bytecode Alliance Wasmtime access control bypass in wasmtime-wasihighCVSS 7.5EPSS 0.5%
- CVE-2026-54786: Bytecode Alliance Wasmtime resource leak in WASIp1 fd_renumbermediumCVSS 5EPSS 0.4%
- Wasmtime-WASI filesystem sandbox escape with symlink renamemediumCVSS 4
- wasmtime-wasi excessive memory allocation when guests lack stdiomediumCVSS 4
- Wasmtime wasmtime-wasi fd_readdir information disclosuremediumCVSS 4
Vulnerabilities per week
1 vulnerability in the last four weeks, down 50% on the four before (2). 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 | 2 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 1 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
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A live badge for a README, a status page or an internal wiki: how many Bytecode Alliance Wasmtime-Wasi vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime-wasi)<a href="https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime-wasi"><img src="https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime-wasi/badge.svg" alt="Bytecode Alliance Wasmtime-Wasi 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/bytecode-alliance-wasmtime-wasi.json, and this page as text at https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime-wasi.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, "Bytecode Alliance Wasmtime-Wasi vulnerabilities", https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime-wasi, 9 November 2026.