CVE-2026-26961
1 advisory.
RubyGems/rack CVE-2026-26961: medium 5.3, EPSS 0.27%
Rack's greedy multipart boundary parsing can cause parser differentials and WAF bypass.
Action: Upgrade rack to 2.2.23 or later.
bundle update rackAffected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 2.2.23 | - |
| 3.0.0.beta1 | 3.1.21 | - |
| 3.2.0 | 3.2.6 | - |
Fixed versions
| 2.2.23 | 3.1.21 | 3.2.6 |
Sources
- osv: GHSA-vgpv-f759-9wx3
- https://github.com/rack/rack/security/advisories/GHSA-vgpv-f759-9wx3
- https://nvd.nist.gov/vuln/detail/CVE-2026-26961
- https://github.com/rack/rack
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2026-26961.yml
CVE-2026-26961 · published · modified · JSON