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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
actix actix-web unaffected
Version Status Constraints
0 affected < 3.12.0
3.12.0 unaffected —

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Project Subscriptions

Vendors Products
Actix Subscribe
Actix-web Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/actix/actix-web/security/advisories/GHSA-xhj4-vrgc-hr34 cve-icon cve-icon
https://www.vulncheck.com/advisories/actix-http-before-http-request-smuggling-via-cl-te cve-icon cve-icon
History

Fri, 14 Aug 2026 11:45:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-14T11:35:45.780Z

Reserved: 2026-08-10T19:10:18.100Z

Link: CVE-2026-73051

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-14T12:16:47.820

Modified: 2026-08-14T12:16:47.820

Link: CVE-2026-73051

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-14T13:15:17Z

Weaknesses