Critical Use-After-Free in Wasmi's Linear Memory

### Summary A use-after-free vulnerability has been discovered in the linear memory implementation of Wasmi. This issue can be triggered by a WebAssembly module under certain memory growth conditions, potentially leading to memory corruption, information disclosure, or code execution. ### Impact - **Confidentiality:** High – attacker-controlled memory reads possible. - **Integrity:** High – memory corruption may allow arbitrary writes. - **Availability:** High – interpreter crashes possible. ### Affected Versions Wasmi `v0.41.0` through Wasmi `v1.0.0`. ### Workarounds - Upgrade to the latest patched version of Wasmi. - Consider limiting the maximum linear memory sizes where feasible. ### Credits This vulnerability was discovered by **Robert T. Morris (RTM)**.

Source published

8 Dec 2025 22:15:49 UTC

Source modified

10 Sep 2026 03:50:31 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Publisher rating · HIGH