Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Versions of ml-dsa before 0.1.0-rc.3 have a timing side-channel in the Decompose algorithm used during signing. The decompose step uses a hardware division instruction whose run time depends on operand values, and those operands are derived from secret key components. An attacker able to take precise timing measurements of signing could learn information about the signing key. Upgrade to ml-dsa 0.1.0-rc.3 or later, which replaces the division with a constant-time Barrett reduction.
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 |
|---|---|---|---|---|
| 6.4 | Medium | 3.1 | CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0016, the 5th 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