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No exploitation reportedFix available

CVE-2026-40560

No exploitation reported by the sources we read.

  • Published2026-04-29
  • Fixed in0.4018
  • WeaknessCWE-444

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Starman incorrectly prioritizes "Content-Length" over "Transfer-Encoding: chunked" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence. An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.

Timeline

dates in UTC
  1. 2026-04-2900:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-02 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-40560?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-40560?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Miyagawa starman
BranchAffectedFixed in
0.4018< 0.40180.4018

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As CPANSec, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • MIYAGAWA Starmanother versions: not affected

    package Starmanhttps://cpan.org/modules

    Affected
    • < 0.4018fixed in 0.4018custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-04-29

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • perl-StarmanopenSUSE:Tumbleweedall versions · fixed in 0.4018-1.1
  • perl-StarmanMageia:9all versions · fixed in 0.401.800-1.mga9
  • starmanUbuntu:26.10all versions · no fixed version listed
  • starmanUbuntu:26.04:LTSall versions · no fixed version listed
  • starmanUbuntu:25.10all versions · no fixed version listed
  • starmanUbuntu:24.04:LTSall versions · no fixed version listed
  • starmanUbuntu:22.04:LTSall versions · no fixed version listed
  • starmanUbuntu:20.04:LTSall versions · no fixed version listed

5 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Miyagawa starman to 0.4018

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2026-04-29
Last Modified
2026-07-24
NVD status
Analyzed
GitHub Advisory
GHSA-gwjf-hg8j-jwvr

Frequently asked questions

What is CVE-2026-40560?

Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Starman incorrectly prioritizes "Content-Length" over "Transfer-Encoding: chunked" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence. An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.

Is CVE-2026-40560 actively exploited?

Active exploitation of CVE-2026-40560 has not been confirmed. Its EPSS score was 0.5% on 2026-11-02, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-40560?

CVE-2026-40560 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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