CVE-2024-23837: LibHTP unbounded folded header handling leads to denial service

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-02-26 · updated 2026-06-17
Weakness: CWE-770

Description

LibHTP is a security-aware parser for the HTTP protocol. Crafted traffic can cause excessive processing time of HTTP headers, leading to denial of service. This issue is addressed in 0.5.46.

Affected products

Fedoraproject Fedora: 38, 39
OISF libhtp: before 0.5.46 — fixed in 0.5.46

How to fix

Upgrade to a fixed version: OISF libhtp 0.5.46. Check the vendor advisory for mitigations.

References

https://github.com/OISF/libhtp/commit/20ac301d801cdf01b3f021cca08a22a87f477c4a
https://github.com/OISF/libhtp/security/advisories/GHSA-f9wf-rrjj-qx8m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GOCOBFUTIFHOP2PZOH4ENRFXRBHIRKK4/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZXJIT7R53ZXROO3I256RFUWTIW4ECK6P/
https://redmine.openinfosecfoundation.org/issues/6444
https://github.com/OISF/libhtp/commit/20ac301d801cdf01b3f021cca08a22a87f477c4a
https://github.com/OISF/libhtp/security/advisories/GHSA-f9wf-rrjj-qx8m
https://lists.debian.org/debian-lts-announce/2025/09/msg00009.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GOCOBFUTIFHOP2PZOH4ENRFXRBHIRKK4/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZXJIT7R53ZXROO3I256RFUWTIW4ECK6P/
https://redmine.openinfosecfoundation.org/issues/6444

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