---
id: CVE-2026-73051
title: >-
  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
summary: >-
  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 …
severity: medium
cwe:
  - CWE-444
vendor: actix-http
product: actix-http
affected:
  - actix-http < 3.12.1
patched:
  - actix-http 3.12.1
published: '2026-08-14'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:02:50.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73051'
references:
  - url: 'https://github.com/actix/actix-web/security/advisories/GHSA-xhj4-vrgc-hr34'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/actix-http-before-http-request-smuggling-via-cl-te
    label: disclosure@vulncheck.com
  - url: 'https://github.com/actix/actix-web'
  - url: 'https://github.com/actix/actix-web/releases/tag/http-v3.12.1'
  - url: 'https://www.rfc-editor.org/rfc/rfc9112.html#name-message-body-length'
tags:
  - nvd
  - osv
  - rust
epss: 0.00566
epssPercentile: 0.44558
aliases:
  - GHSA-xhj4-vrgc-hr34
ecosystem: rust
ingestedAt: '2026-08-15T19:19:54.531Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-73051)

Affected packages:

- `actix-http < 3.12.1`

Patched in:

- `actix-http 3.12.1`

Source: https://osv.dev/vulnerability/GHSA-xhj4-vrgc-hr34