CVE-2026-73051
actix-http: Actix-http: HTTP Request Smuggling via malformed HTTP/1.1 headers
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · August 14, 2026
Updated · August 27, 2026
Description
A flaw was found in actix-http. This vulnerability allows unauthenticated remote attackers to perform HTTP request smuggling. By sending specially crafted HTTP/1.1 requests that include both Content-Length and Transfer-Encoding: chunked headers, an attacker can desynchronize backend requests through a front-end intermediary. This desynchronization enables the attacker to smuggle malicious HTTP requests to the Actix service, potentially leading to unauthorized actions or data manipulation.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')