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CVE-2026-73051

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

MEDIUM
6.3
CVSS Score
Published: August 14, 2026 at 11:35 AM UTC
Updated: September 24, 2026 at 08:17 PM UTC
1 product affected across 1 vendorActix Web

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Actix Web· Actixcargo
95%
v < 3.12.0
Vendor states this is fixed in 3.12.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/actix/actix-web/security/advisories/GHSA-xhj4-vrgc-hr34
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/actix-http-before-http-request-smuggling-via-cl-te

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMVulnCheck
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-444

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