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TI-2026-47509 Aliases CVE-2026-67182GHSA-frmw-v2hf-gvj9

Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection

Priority MEDIUM 64CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Rouille 0.3.3 through 3.6.2 contains an HTTP request smuggling vulnerability that allows remote attackers to bypass access controls by injecting bare line feed characters (0x0A) into client-supplied request header values that are copied verbatim to upstream connections without validation. Attackers can craft a header value containing a complete additional HTTP request that is interpreted as a separate request by backends such as Go net/http and Python http.server, causing the backend to process a smuggled request with attacker-chosen method, path, and headers that bypasses the rouille handler's access control logic.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00629 50th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
tomakarouille0.3.3 – 3.6.2—No fix listedCNA
  • rouille Vendortomaka Affected 0.3.3 – 3.6.2 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-67182
  2. 2026-10-03 Alias added: GHSA-frmw-v2hf-gvj9
  3. 2026-10-29 EPSS moved to the 50th–90th percentile

References

Exploit 1

  • TI-2026-47402 Rouille 0.1.6 - 3.6.2 Reachable Assertion DoS via remove_prefix percent-encoding CVSS 4.0HIGH 8.2
  • TI-2026-47508 Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Transfer-Encoding Header CVSS 4.0MEDIUM 6.3
  • TI-2026-47394 Rouille 0.4.0 - 3.6.2 HTTP Response Splitting via Header Injection CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences