CVE Explorer
CVE-2026-34945
Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Winch compiler contains a bug where a 64-bit table, part of the memory64 proposal of WebAssembly, incorrectly translated the table.size instruction. This bug could lead to disclosing data on the host's stack to WebAssembly guests. The host's stack can possibly contain sensitive data related to other host-originating operations which is not intended to be disclosed to guests. This bug specifically
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":">= 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:f2effef54af02345dcc3a20d41281bf2d40b2558f5d50f174a53a2ffa5d42a11 · sha256:cc0c56c62ba66bb1… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:f2effef54af02345dcc3a20d41281bf2d40b2558f5d50f174a53a2ffa5d42a11 · sha256:cc0c56c62ba66bb1… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-681","description":"CWE-681: Incorrect Conversion between Numeric Types","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:f2effef54af02345dcc3a20d41281bf2d40b2558f5d50f174a53a2ffa5d42a11 · sha256:cc0c56c62ba66bb1… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9w2-8782-2946","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9w2-8782-2946"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:f2effef54af02345dcc3a20d41281bf2d40b2558f5d50f174a53a2ffa5d42a11 · sha256:cc0c56c62ba66bb1… · /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.