Wasmtime panics when lifting `flags` component value (bytecodealliance wasmtime)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.32 % · percentile 25 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
Description
Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime contains a possible panic which can happen when a flags-typed component model value is lifted with the Val type. If bits are set outside of the set of flags the component model specifies that these bits should be ignored but Wasmtime will panic when this value is lifted. This panic only affects wasmtime's implementation of lifting into Val, not when using the flags! macro. This additionally only affects flags-typed values which are part of a WIT interface. This has the risk of being a guest-controlled panic within the host which Wasmtime considers a DoS vector. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.
Weaknesses (CWE)
- CWE-248 — Uncaught Exception
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 4.0 | MEDIUM 5.6 | CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | GitHub_M |
| CVSS 4.0 | MEDIUM 5.6 | CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2026-21022
- GCVE · GCVE-0-2026-34943
Affected configurations (NVD CPE)
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*< 24.0.7cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*≥ 25.0.0 < 36.0.7cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*≥ 37.0.0 < 42.0.2cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*≥ 43.0.0 < 43.0.1
Affected products
| Product | Versions |
|---|---|
| bytecodealliance · wasmtime | affected < 24.0.7 ; affected >= 25.0.0, < 36.0.7 ; affected >= 37.0.0, < 42.0.2 ; affected >= 43.0.0, < 44.0.1 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |