Denial of Service Vulnerability in Wasmtime by Bytecode Alliance
CVE-2026-115385

6.9MEDIUM

Key Information:

Vendor

Bytecodealliance

Status
Wasmtime
Vendor
CVE Published:
22 October 2026

What is CVE-2026-115385?

The identified vulnerability in Wasmtime allows a guest to trigger an assertion failure in the Unix host process by using the WASIp3 implementation's set-times or set-times-at functions with negative timestamps. This behavior is specifically problematic for guests with mutable preopened directory access, potentially leading to a denial of service condition as the host process becomes unresponsive due to the crash that occurs when the assertion fails.

Affected Version(s)

wasmtime 46.0.0 < 48.0.4

wasmtime 49.0.0 < 49.0.2

wasmtime 48.0.4

References

https://github.com/bytecodealliance/wasmtime/security/adv...
vendor-advisory
https://www.vulncheck.com/advisories/wasmtime-46.0.0-befo...
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
.