Skip to main content
VulnerabilityPublished

Wasmtime wasi: wasip3 UDP `send` can deliver a datagram to an address only allowed for receiving

Affects wasmtime-wasiSource GCVE Database

0

CVSS 6.4 Medium · fixed in 50.0.1 : update wasmtime-wasi when convenient.

Data as of 30 Oct 2026, 11:16 UTC

CVSS 3.1 base score
6.4Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 50.0.1, 49.0.5, 48.0.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

What to do

Upgrade wasmtime-wasi to 50.0.1, 49.0.5 or 48.0.8.

Affected software

ProductAffectedFixed in
crates.iowasmtime-wasipkg:cargo/wasmtime-wasiOther threatsAffected
  • >=48.0.0 <48.0.8
  • >=49.0.0 <49.0.5
  • >=50.0.0 <50.0.1
Fixed in
  • 48.0.8
  • 49.0.5
  • 50.0.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Apply the official patches by upgrading to wasmtime-wasi versions 48.0.8, 49.0.5, or 50.0.1 or later. Since patches are available, remediation should be performed promptly to prevent potential exploitation.

Description

A vulnerability in Wasmtime wasi's wasip3 UDP `send` function allows sending a datagram to an address that should only be permitted for receiving. This issue affects multiple versions of wasmtime-wasi prior to fixed releases. The flaw has a medium severity with a CVSS score of 6.4 and impacts confidentiality and integrity but not availability. Official patches are available in versions 48.0.8, 49.0.5, and 50.0.1.

References

Community reviews

Loading reviews…