Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The wasmtime crate versions before 10.0.2, from 11.0.0 before 11.0.2, and from 12.0.0 before 12.0.2 are affected by a miscompilation of the wasm i64x2.shr_s instruction when its input is a constant on x86_64. The source gives few details about how an attacker would trigger it or what the resulting impact is. Upgrade to wasmtime 10.0.2, 11.0.2, or 12.0.2 depending on your release line.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 2.2 | Low | 3.1 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0067, the 52nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:24 UTC First seen by agentprime
- 31 Oct 2026, 14:24 UTC Confirmed by OSV