Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Golang.org/x/crypto/ssh versions before 0.52.0 are vulnerable to denial of service through crafted RSA or DSA public keys with excessively large parameters, which can cause several minutes of CPU use during signature verification. An unauthenticated client can trigger this during public key authentication, with no account required. Upgrade golang.org/x/crypto to version 0.52.0 or later.
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:N/A:H | ADP (CISA-ADP) |
- CISA KEV Not listed.
- EPSS 0.0047, the 40th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:13 UTC First seen by agentprime
- 31 Oct 2026, 14:13 UTC Confirmed by OSV