CVE-2026-34835
1 advisory.
RubyGems/rack CVE-2026-34835: medium 4.8
Rack::Request accepts invalid Host characters, enabling host allowlist bypass
Action: Upgrade rack to 3.1.21 or later.
bundle update rackAffected
| introduced | fixed | last affected |
|---|---|---|
| 3.0.0.beta1 | 3.1.21 | - |
| 3.2.0 | 3.2.6 | - |
Fixed versions
| 3.1.21 | 3.2.6 |
Sources
- osv: GHSA-g2pf-xv49-m2h5
- https://github.com/rack/rack/security/advisories/GHSA-g2pf-xv49-m2h5
- https://nvd.nist.gov/vuln/detail/CVE-2026-34835
- https://github.com/rack/rack
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2026-34835.yml
CVE-2026-34835 · published · modified · JSON