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 |
|---|---|---|---|---|
| 6.0 | Medium | 4.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0049, the 42nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:16 UTC First seen by agentprime
- 31 Oct 2026, 15:16 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-j3g3-5qv5-52mj
- OSV: GHSA-j3g3-5qv5-52mj
- github.com/ruby/net-imap/security/advisories/GHSA-j3g3-5qv5-52mj
- nvd.nist.gov/vuln/detail/CVE-2025-43857
- github.com/ruby/net-imap/pull/442
- github.com/ruby/net-imap/pull/444
- github.com/ruby/net-imap/pull/444/commits/0ae8576c1a90bcd9573f81bdad4b4b824642d105#diff-53721cb4d9c3fb86b95cc8476ca2df90968ad8c481645220c607034399151462
- github.com/ruby/net-imap/pull/445
- github.com/ruby/net-imap/pull/446
- github.com/ruby/net-imap/pull/447
- github.com/ruby/net-imap
- github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2025-43857.yml