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CVE-2026-115382GHSA-w4qr-p94g-mjhv

Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout Panic DoS

bytecodealliance wasmtime
Open in ThreatlineRecord JSON
CVSS
5.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.23%Chance of exploitation activity in the next 30 days, higher than 12% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in48.0.4Also 49.0.2CVE 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 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial-of-service vulnerability in its wasi:http implementation that allows guests to panic the host. Guests can specify a zero between-bytes-timeout request option, which is forwarded directly to a Tokio API that panics, crashing the host embedding.

Text from CVE List

Affected versions 4

  • wasmtimeaffected: 46.0.0 before 48.0.4CVE List
  • wasmtimeunaffected: 48.0.4CVE List
  • wasmtimeaffected: 49.0.0 before 49.0.2CVE List
  • wasmtimeunaffected: 49.0.2CVE List

References 2