Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
SM9 decryption in github.com/emmansun/gmsm before 0.41.1 accepts a ciphertext whose C1 component is the point at infinity, which lets an attacker who knows only the recipient's UID forge a ciphertext that decrypts successfully to attacker-chosen plaintext. The issue affects sm9.Decrypt, sm9.DecryptASN1 and sm9.UnwrapKey, and the source describes its impact as integrity and authenticity loss rather than exposure of private keys. Upgrade to version 0.41.1, which is the listed fix.
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 |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0024, the 14th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:09 UTC First seen by agentprime
- 31 Oct 2026, 15:09 UTC Confirmed by OSV