Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
openssl_encrypt versions before 1.4.9 use a denylist to identify trusted built-in plugins, so unsigned plugins placed in top-level plugins/ directories or unknown subdirectories can bypass signature verification. An attacker who can place a malicious plugin in these locations can achieve arbitrary code execution in the CLI process, with access to passwords and cryptographic keys. Upgrade to openssl_encrypt 1.4.9 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 |
|---|---|---|---|---|
| 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 0.0043, the 37th percentile, on 9 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