Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
openssl-encrypt versions before 1.4.0 have a logging bug in restore_hidden_modules() that logs module counts after they are cleared, so the log always shows zero restored modules and audit trails become unreliable. A race condition between module hiding and import hook installation can also let another thread re-import blocked modules in multi-threaded environments. The source gives few details about the attacker's requirements or the impact of the race condition. Upgrade to version 1.4.0 or later, which is the listed fixed version.
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 |
|---|---|---|---|---|
| 9.3 | Critical | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA (VulnCheck) |
- CISA KEV Not listed.
- EPSS 0.0021, the 10th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:38 UTC First seen by agentprime
- 31 Oct 2026, 14:38 UTC Confirmed by OSV