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CVE-2026-73051— actix-http before 3.12.1 HTTP Request Smuggling via CL.TE

Quick assessment

Affected
actix actix-web
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Actix Web是Actix组织开源的一个高性能Web框架。 Actix Web 3.12.1之前版本存在输入验证错误漏洞，该漏洞源于HTTP/1.1解析器接受同时包含Content-Length和Transfer-Encoding: chunked头的请求，可能导致未经身份验证的远程攻击者通过前端中介使后端请求失同步，并向Actix服务走私恶意HTTP请求。

CVSS 6.3 · Medium EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol

Affected Version Matrix 2

VendorProduct Version RangeStatus
actix actix-web < 3.12.0 affected
3.12.0 unaffected
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I. Basic Information for CVE-2026-73051

Vulnerability Information
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Vulnerability Title
actix-http before 3.12.1 HTTP Request Smuggling via CL.TE
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Actix Web 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Actix Web是Actix组织开源的一个高性能Web框架。 Actix Web 3.12.1之前版本存在输入验证错误漏洞，该漏洞源于HTTP/1.1解析器接受同时包含Content-Length和Transfer-Encoding: chunked头的请求，可能导致未经身份验证的远程攻击者通过前端中介使后端请求失同步，并向Actix服务走私恶意HTTP请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
actix actix-web 0 ~ 3.12.0 -

II. Public POCs for CVE-2026-73051

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III. Intelligence Information for CVE-2026-73051

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Vendor Advisories for CVE-2026-73051 (2)

Same Patch Batch · actix · 2026-08-14 · 3 CVEs total

CVE-2026-72813 6.9 MEDIUM actix-files before 0.6.10 Denial of Service via empty Range header
CVE-2026-72814 6.3 MEDIUM actix-web before 0.6.10 Information Disclosure via Files

IV. Related Vulnerabilities

Same product: actix-web
Same vendor: actix
Same weakness: CWE-444

V. Comments for CVE-2026-73051

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