CVE-2026-119141

CVSS 6.9 (medium) · published 2026-10-29

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious Wasm modules to panic the host because the may_leave flag is not cleared during realloc. Attackers can call into the host from realloc while lowering stream or future results, such as cancelling the active read or re-waiting a waitable-set, crashing the host.

Weakness: CWE-1265

Source: NVD CVE-2026-119141

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-7v24-42x9-pxf7
• https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-host-panic-via-realloc

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