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 |
|---|---|---|---|---|
| 8.6 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS 0.034, the 88th percentile, on 6 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-5f9h-9pjv-v6j7
- OSV: GHSA-5f9h-9pjv-v6j7
- nvd.nist.gov/vuln/detail/CVE-2020-8161
- github.com/rack/rack/commit/dddb7ad18ed79ca6ab06ccc417a169fde451246e
- github.com/rack/rack
- github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2020-8161.yml
- groups.google.com/forum/#!topic/ruby-security-ann/T4ZIsfRf2eA
- groups.google.com/g/rubyonrails-security/c/IOO1vNZTzPA
- lists.debian.org/debian-lts-announce/2020/07/msg00006.html
- lists.debian.org/debian-lts-announce/2023/01/msg00038.html
- usn.ubuntu.com/4561-1