Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-40560
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-29 00:16:03 UTC
Updated2026-05-06 16:35:19 UTC
DescriptionStarman 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.000400000 probability, percentile 0.119380000 (date 2026-05-05)

Problem Types: CWE-444 | CWE-444 CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Miyagawa Starman All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA MIYAGAWA Starman affected 0.4018 custom Not specified

References

ReferenceSourceLinkTags
datatracker.ietf.org/doc/html/rfc7230 9b29abf9-4ab0-4765-b253-1875cd9b441e datatracker.ietf.org Third Party Advisory
github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b10422060... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com Patch, Third Party Advisory
www.openwall.com/lists/oss-security/2026/04/29/1 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
metacpan.org/release/MIYAGAWA/Starman-0.4018/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Product, Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: CPANSec (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-12T00:00:00.000ZIssue identified by CPANSec
CNA2026-04-27T00:00:00.000ZIssue reported to software maintainer
CNA2026-04-27T00:00:00.000ZFix committed to public Github repository
CNA2026-04-27T00:00:00.000ZUpdated version uploaded to CPAN

Solutions

CNA: Upgrade to version 0.4018

© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report