HTTP Response Splitting Affecting rust-rouille package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.34% (25th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-RUSTROUILLE-18384816
  • published29 Jul 2026
  • disclosed28 Jul 2026

Introduced: 28 Jul 2026

CVE-2026-66746  (opens in a new tab)
CWE-113  (opens in a new tab)

How to fix?

There is no fixed version for Debian:unstable rust-rouille.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rust-rouille package and not the rust-rouille package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1