CVE-2025-25184
Description
Rack provides an interface for developing web applications in Ruby. Prior to versions 2.2.11, 3.0.12, and 3.1.10, Rack::CommonLogger can be exploited by crafting input that includes newline characters to manipulate log entries. The supplied proof-of-concept demonstrates injecting malicious content into logs. When a user provides the authorization credentials via Rack::Auth::Basic, if success, the username will be put in env['REMOTE_USER'] and later be used by Rack::CommonLogger for logging purposes. The issue occurs when a server intentionally or unintentionally allows a user creation with the username contain CRLF and white space characters, or the server just want to log every login attempts. If an attacker enters a username with CRLF character, the logger will log the malicious username with CRLF characters into the logfile. Attackers can break log formats or insert fraudulent entries, potentially obscuring real activity or injecting malicious data into log files. Versions 2.2.11, 3.0.12, and 3.1.10 contain a fix.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 3.1.12-1 |
| sid | Fixed | 3.1.12-1 |
| forky | Fixed | 3.1.12-1 |
| bullseye | Fixed | 2.1.4-3+deb11u3 |
| bookworm | Fixed | 2.2.13-1~deb12u1 |
Red Hat Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 9 | Fixed | — |
References
- https://github.com/rack/rack/security/advisories/GHSA-7g2v-jj9q-g3rg
- https://access.redhat.com/errata/RHSA-2025:7085
- https://www.suse.com/security/cve/CVE-2025-25184.html
- https://nvd.nist.gov/vuln/detail/CVE-2025-25184
- https://github.com/rack/rack/commit/074ae244430cda05c27ca91cda699709cfb3ad8e
- https://github.com/rack/rack
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2025-25184.yml
- https://lists.debian.org/debian-lts-announce/2025/03/msg00016.html
- https://security-tracker.debian.org/tracker/CVE-2025-25184
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.