CVE-2026-40562Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.
Updated under an hour ago ()
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It affects kazeburo gazelle. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-444
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
kazeburo gazelle kazeburo:gazelle | before 0.50 | NVD |
References
- https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3third-party-advisory
- https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changesrelease-notes
- https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patchpatch
- http://www.openwall.com/lists/oss-security/2026/05/06/7mailing-list, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.