CVE-2026-66746

MEDIUM 5.4

Rouille 0.4.0 - 3.6.2 HTTP Response Splitting via Header Injection

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

Rouille 0.4.0 through 3.6.2 contains an HTTP response splitting vulnerability that allows remote attackers to inject arbitrary response headers by embedding carriage return (0x0D) or line feed (0x0A) bytes into attacker-controlled input. Attackers can exploit percent-decoded query parameters reflected into response headers or inject bare LF characters into Cookie header values that are interpolated directly into Set-Cookie response headers, enabling cache poisoning, session fixation, and security header override attacks such as bypassing CSP or CORS policies.

CWE	CWE-113
Vendor	tomaka
Product	rouille
Published	Jul 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

tomaka / rouille

0.4.0 ≤ 3.6.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/theopaid/HTTP-Response-Splitting-via-Unvalidated-Response-Header-Values-rouille- vulncheck.com: https://www.vulncheck.com/advisories/rouille-http-response-splitting-via-header-injection

Credits

Theodosis Paidakis