CVE-2026-115387

Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Host Panic via WASI Filesystem Timestamp Overflow

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

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Description

Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 contains a denial of service vulnerability in wasmtime-wasi that allows guest WASI programs to panic the host via overflowing filesystem timestamps. Attackers can pass atim or mtim values whose sub-second field overflows the seconds field to path_filestat_set_times, fd_filestat_set_times, set-times, or set-times-at, crashing the host.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	6.2 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
wasmtimebytecodealliance	before 36.0.16Affected 36.0.16Not affected 37.0.0 to before 48.0.3Affected 48.0.3Not affected 49.0.0 to before 49.0.1Affected 49.0.1Not affected

References

GitHub Security Advisory (GHSA-j2g9-4prp-pf6h)vendor-advisory
VulnCheck Advisory: Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Host Panic via WASI Filesystem Timestamp Overflowthird-party-advisory

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