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 |
|---|---|---|---|---|
| 5.8 | Medium | 4.0 | CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0078, the 56th 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-75xq-5h9v-w6px
- OSV: GHSA-75xq-5h9v-w6px
- github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px
- nvd.nist.gov/vuln/detail/CVE-2026-42258
- github.com/ruby/net-imap/commit/aec06996eb87a7e1bbcef1f9f8926e8add2b8c71
- github.com/ruby/net-imap/commit/9db3e9d60bfb8f3735ea95015bf8a700f4af9cbb
- github.com/ruby/net-imap/commit/6bf02aef7e0b5931010c36e377f79a71636b306b
- access.redhat.com/errata/RHSA-2026:33462
- access.redhat.com/errata/RHSA-2026:37238
- access.redhat.com/errata/RHSA-2026:37397
- access.redhat.com/errata/RHSA-2026:38694
- access.redhat.com/errata/RHSA-2026:40380
- access.redhat.com/security/cve/CVE-2026-42258
- bugzilla.redhat.com/show_bug.cgi?id=2468498