CVE-2026-115379

Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via try_call

State: Published
Severity: 6.9 Medium
Published: Oct 22, 2026
Updated: Oct 22, 2026
Reserved: Oct 22, 2026

Description

Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a missing GC rooting vulnerability that leaves references live across try_call unrooted when compiling Wasm modules. Attackers can supply Wasm modules whose callee triggers garbage collection, leaving stale or dangling references that cause GC heap corruption or incorrect execution.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	5.7 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
wasmtimebytecodealliance	47.0.0 to before 48.0.4Affected 48.0.4Not affected 49.0.0 to before 49.0.2Affected 49.0.2Not affected

References

GitHub Security Advisory (GHSA-hw8m-q44c-ggrf)vendor-advisory
VulnCheck Advisory: Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via try_callthird-party-advisory

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