All vulnerabilities
CVE-2026-115390GHSA-m63x-6p34-q65x

Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoS

bytecodealliance wasmtime
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in48.0.3Also 49.0.1CVE List
Published22 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 contains a fuel accounting flaw in Cranelift-compiled call_ref and try_table catch paths. Malicious guests can reset consumed fuel after calls to run exponentially long on linear fuel, evading timeouts and periodic yields for denial of service.

Text from CVE List

Affected versions 5

  • wasmtimeaffected: 47.0.0 before 48.0.3CVE List
  • wasmtimeunaffected: 48.0.3CVE List
  • wasmtimeaffected: 49.0.0 before 49.0.1CVE List
  • wasmtimeunaffected: 49.0.1CVE List
  • wasmtime, rust>= 47.0.0, < 48.0.3, 49.0.0GitHub

References 2