Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence

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Summary

CVECVE-2026-40562
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 13:16:09 UTC
Updated2026-05-11 15:04:24 UTC
DescriptionGazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Gazelle 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:N/I:H/A:N

EPSS: 0.000380000 probability, percentile 0.113870000 (date 2026-05-12)

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

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Kazeburo Gazelle All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA KAZEBURO Gazelle affected 0.49 custom Not specified

References

ReferenceSourceLinkTags
datatracker.ietf.org/doc/html/rfc7230 9b29abf9-4ab0-4765-b253-1875cd9b441e datatracker.ietf.org Third Party Advisory
security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch 9b29abf9-4ab0-4765-b253-1875cd9b441e security.metacpan.org Patch
metacpan.org/release/KAZEBURO/Gazelle-0.50/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Release Notes
www.openwall.com/lists/oss-security/2026/05/06/7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
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
CNA2026-04-29T00:00:00.000ZIssue reported to software maintainer
CNA2026-05-06T00:00:00.000ZIssue disclosed by CPANSec
CNA2026-05-07T00:00:00.000ZGazelle 0.50 released

Solutions

CNA: Upgrade to Gazelle 0.50 or later.

Workarounds

CNA: Migrate to Starman version 0.4018 or newer which has fixed the issue. Or apply the patch.

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