CVE Explorer
CVE-2026-34943
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
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"wasmtime","vendor":"bytecodealliance","versions":[{"status":"affected","version":"< 24.0.7"},{"status":"affected","version":">= 25.0.0, < 36.0.7"},{"status":"affected","version":">= 37.0.0, < 42.0.2"},{"status":"affected","version":">= 43.0.0, < 44.0.1"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:6b86e5debd48cdae781555a569ad5eaec6743dd8f430dce3bcb130edea1d6192 · sha256:21f2462ac6d0504a… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":5.6,"baseSeverity":"MEDIUM","privilegesRequired":"HIGH","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:6b86e5debd48cdae781555a569ad5eaec6743dd8f430dce3bcb130edea1d6192 · sha256:21f2462ac6d0504a… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:6b86e5debd48cdae781555a569ad5eaec6743dd8f430dce3bcb130edea1d6192 · sha256:21f2462ac6d0504a… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m758-wjhj-p3jq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m758-wjhj-p3jq"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:6b86e5debd48cdae781555a569ad5eaec6743dd8f430dce3bcb130edea1d6192 · sha256:21f2462ac6d0504a… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.