CVE-2026-115379

6.9 mediumEPSS 0.3%

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.

CVSS 4.0: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 5.7CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
EPSS: 0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-25)
CWE: CWE-416
Published: 2026-10-22
Modified: 2026-10-22
Record from: the NVD, synced 2026-10-23

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
RUSTSEC-2026-0326	crates.io	wasmtime	>=47.0.0 <48.0.4 >=49.0.0 <49.0.2	48.0.4, 49.0.2

References

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hw8m-q44c-ggrf
https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.4-and-49.0.0-before-49.0.2-gc-heap-corruption-via-try-call

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