CVE-2026-66754: high-severity vulnerability in tomaka rouille
Rouille 0.1.6 - 3.6.2 Reachable Assertion DoS via remove_prefix percent-encoding
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.2epss 0.6%
from disclosure to weaponsame day
Published on NVDJul 28
1st PoCJul 26
Rouille 0.1.6 through 3.6.2 contains a reachable assertion vulnerability in the Request::remove_prefix function that allows remote unauthenticated attackers to crash the server by sending a crafted percent-encoded URL. Attackers can send a request whose decoded path matches a configured prefix while the raw percent-encoded path does not, causing the assert! to fail and triggering either a 500 error or full process termination depending on the panic configuration.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
tomaka · rouillepublic PoCs found — 2
githubgithub.com/theopaid/CVE-2026-66754-Remote-Denial-of-Service-via-Reachable-Assertion-in-URL-Prefix-Handling-rouille-★ 0cve_referencegithub.com/theopaid/Remote-Denial-of-Service-via-Reachable-Assertion-in-URL-Prefix-Handling-rouille-unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — tomaka rouille
In the same product, most dangerous first.
CVE-2026-67182MEDIUMRouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header InjectionEPSS 0.6%CVE-2026-67181MEDIUMRouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Transfer-Encoding HeaderEPSS 0.4%CVE-2026-66746MEDIUMRouille 0.4.0 - 3.6.2 HTTP Response Splitting via Header InjectionEPSS 0.3%