CVE-2026-115392

Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 Sandbox Escape via Trailing Slashes

State: Published
Severity: 8.8 High
Published: Oct 22, 2026
Updated: Oct 29, 2026
Reserved: Oct 22, 2026

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Description

Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 allows a filesystem sandbox escape in wasmtime-wasi because its cap-std dependency mishandles symlinks with trailing slashes on macOS and Linux kernels lacking openat2. A guest with write access to any sandboxed directory can read and write any host-accessible file, and read-only guests may read host files via preexisting symlinks.

Scores

CVSS	Score	Vector	Source
4.0	8.8 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L	VulnCheck
3.1	7.9 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L	VulnCheck

Weaknesses

CWE-61 UNIX Symbolic Link (Symlink) Following

Affected Products

Product	Versions
wasmtimebytecodealliance	before 24.0.13Affected 24.0.13Not affected 25.0.0 to before 36.0.14Affected 36.0.14Not affected 37.0.0 to before 46.0.3Affected 46.0.3Not affected 47.0.0 to before 47.0.4Affected 47.0.4Not affected

References

GitHub Security Advisory (GHSA-vqjp-4c8c-hfgg)vendor-advisory
VulnCheck Advisory: Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 Sandbox Escape via Trailing Slashesthird-party-advisory

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