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Vulnerability record · CVE-2026-40562 · published 6 May 2026

CVE-2026-40562: Kazeburo gazelle http request smuggling vulnerability

KKazeburo · Gazelle

Gazelle 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.

7.5 CVSS 3.1 High EPSS 0.50% · top 59.6% CWE-444 · HTTP request smuggling
7.5CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Gazelle 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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 Third Party Advisory
https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes Release Notes
https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch Patch
http://www.openwall.com/lists/oss-security/2026/05/06/7 Mailing ListThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-40562), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.