Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The cryptography package for Python is vulnerable in versions before 42.0.0. A remote attacker may be able to exploit a Bleichenbacher-style timing oracle to decrypt captured messages from TLS servers that use RSA key exchanges, exposing confidential data. Upgrade to version 42.0.0 or later. The source gives few details about the exact conditions of the attack.
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:H/I:N/A:N | CNA (redhat) |
- CISA KEV Not listed.
- EPSS 0.011, the 66th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:36 UTC First seen by agentprime
- 31 Oct 2026, 14:36 UTC Confirmed by OSV