6.3

CVE-2026-73051: actix actix-web HTTP Request/Response Smuggling

CVSS: 6.3v4.0MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-73051DEBIAN-CVE-2026-73051GHSA-xhj4-vrgc-hr34
Published 14-08-2026Last modified 14-08-2026
Open JSON

Vulnerability summary

CVE-2026-73051 is a medium (CVSS 6.3) HTTP Request/Response Smuggling vulnerability in actix actix-web. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.2% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.57%
0%100%
Low · +0.23 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-08-2026
    PublishedVulnerability first disclosed.
  2. 14-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

+0.23 pp

From 0.34% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.57%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Actix1 product
Crates.Io1 product
  • actix-http< 3.12.1
Debian1 product
  • rust-actix-httpAll versions (No fix recorded) | < 3.13.1-1
Ubuntu1 product
  • rust-actix-httpAll versions (No fix recorded)

4 vendors · 4 products

References

8 links