CVE-2026-73051

actix-http before 3.12.1 HTTP Request Smuggling via CL.TE

Published Aug 14, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Actix actix-http
CPEs cpe:2.3:a:actix:actix-web:*:*:*:*:*:rust:*:* cpe:2.3:a:actix:actix-http:*:*:*:*:*:rust:*:*
Vendors & Products Actix actix-http
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title actix-http before 3.12.1 HTTP Request Smuggling via CL.TE
First Time appeared Actix
Actix actix-web
Weaknesses CWE-444
CPEs cpe:2.3:a:actix:actix-web:*:*:*:*:*:rust:*:*
Vendors & Products Actix
Actix actix-web
References
Metrics cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 29, 2026, 9:16 PM
Reserved
Aug 10, 2026, 7:10 PM
Status
Awaiting Analysis
Published
Aug 14, 2026, 12:16 PM
Modified
Oct 29, 2026, 9:17 PM