Denial of Service Vulnerability in Wasmtime by Bytecode Alliance
CVE-2026-115387

6.9MEDIUM

Key Information:

Vendor

Bytecodealliance

Status
Wasmtime
Vendor
CVE Published:
22 October 2026

What is CVE-2026-115387?

A Denial of Service vulnerability exists in Wasmtime in the wasmtime-wasi component that could lead to host crashes. By manipulating filesystem timestamps through specific WASI program calls such as path_filestat_set_times or fd_filestat_set_times, attackers can input overflowing timestamp values, risking a panic state for the host environment.

Affected Version(s)

wasmtime 0 < 36.0.16

wasmtime 37.0.0 < 48.0.3

wasmtime 49.0.0 < 49.0.1

References

https://github.com/bytecodealliance/wasmtime/security/adv...
vendor-advisory
https://www.vulncheck.com/advisories/wasmtime-before-36.0...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

xia-chao
.