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Fencer Intel
medium 6.3

CVE-2026-73051 json

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

published 6mo ago modified 13d ago also EUVD-2026-58619 , GHSA-xhj4-vrgc-hr34

cvss
6.3
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

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 this through a front-end intermediary to desynchronize backend requests and smuggle malicious HTTP requests to the Actix service.

Patch / fix

  • crates.io actix-http 3.12.1
  • actix actix-http 3.12.1
  • rust-actix-http Debian 14 3.13.1-1

debian advisories DEBIAN-CVE-2026-73051

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-73051 updated cvss 5.3

actix-http: Actix-http: HTTP Request Smuggling via malformed HTTP/1.1 headers

  • Red Hat Enterprise Linux 9 keylime-agent-rust, keylime-agent-rust 0.2.7-2.el10 Red Hat Enterprise Linux 10 trustee 0.15.0-2.el10, keylime-agent-rust 0.2.7-2.el10 Red Hat OpenShift Update Service openshift-update-service/openshift-update-service-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9 Red Hat Connectivity Link 1 rhcl-1/limitador-rhel9
    not affected: vulnerable code not present
  • Red Hat Hardened Images rust 1.97.1-2.hum1
    not affected: component not present
  • Red Hat Trusted Profile Analyzer rhtpa/rhtpa-rhel10, rhtpa/rhtpa-trustification-service-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 6.3 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
CNA 4.0 6.3 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/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

Affected packages

ecosystem package affected fixed in
crates.io actix-http
<3.12.1
3.12.1

Affected products

  • actix actix-http

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.