CVE-2026-73051

actix-http versions before 3.12.1 contain an HTTP request smuggling vulnerability in the HTTP/1.1 parser that accepts requests with both Content-Length and Transfer-Encoding: chunked headers. Unauthenticated remote attackers can exploit this through a front-end intermediary to desynchronize backend requests and smuggle malicious HTTP requests to the Actix service.

Score

CVSS 4.0 6.3 Medium

Status

Awaiting Analysis - disclosure@vulncheck.com

Published

2026-08-14

Last modified

2026-08-14

Weaknesses

CWE-444

Affected products

• Actix-web (Actix)

References

• https://github.com/actix/actix-web/security/advisories/GHSA-xhj4-vrgc-hr34
• https://www.vulncheck.com/advisories/actix-http-before-http-request-smuggling-via-cl-te