CVE-2026-73051
actix-http before 3.12.1 HTTP Request Smuggling via CL.TE
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.
INFO
Published Date :
Aug. 14, 2026, 12:16 p.m.
Last Modified :
Aug. 14, 2026, 12:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update actix-http to version 3.12.1 or later.
- Configure HTTP parsers to reject ambiguous headers.
- Use a Web Application Firewall for protection.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-73051.
| URL | Resource |
|---|---|
| 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-73051 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-73051
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-73051 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-73051 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 14, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'actix', 'product': 'actix-web', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.12.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '3.12.0', 'versionType': 'semver'}], 'packageURL': 'pkg:cargo/actix-http', 'defaultStatus': 'unaffected'}] 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-444 Added Reference https://github.com/actix/actix-web/security/advisories/GHSA-xhj4-vrgc-hr34 Added Reference https://www.vulncheck.com/advisories/actix-http-before-http-request-smuggling-via-cl-te