CVE-2024-45797: LibHTP's unbounded header handling leads to denial service

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-10-16 · updated 2026-06-17
Weakness: CWE-770

Description

LibHTP is a security-aware parser for the HTTP protocol and the related bits and pieces. Prior to version 0.5.49, unbounded processing of HTTP request and response headers can lead to excessive CPU time and memory utilization, possibly leading to extreme slowdowns. This issue is addressed in 0.5.49.

Affected products

OISF libhtp: before 0.5.49 — fixed in 0.5.49

How to fix

Upgrade to a fixed version: OISF libhtp 0.5.49. Check the vendor advisory for mitigations.

References

https://github.com/OISF/libhtp/security/advisories/GHSA-rqqp-24ch-248f
https://redmine.openinfosecfoundation.org/issues/7191
https://lists.debian.org/debian-lts-announce/2025/09/msg00009.html

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