CVE catalog
CVE-2025-53537
LibHTP vulnerabilities
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.50% · Oct 25, 2026
LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set `suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled` to false. This issue is fixed in version 0.5.51.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libhtp | trixie | 1:0.5.50-1+deb13u1 | fixed |
| Debian | libhtp | bookworm | 1:0.5.42-1+deb12u1 | not affected |
| Ubuntu | libhtp | noble | 1:0.5.46-1ubuntu2+esm1 | fixed |
| Ubuntu | libhtp-dev | noble | 1:0.5.46-1ubuntu2+esm1 | fixed |
| Ubuntu | libhtp2 | noble | 1:0.5.46-1ubuntu2+esm1 | fixed |
| Ubuntu | libhtp | pro | 1:0.5.45-1 | vulnerable |
| Ubuntu | libhtp | pro | 1:0.5.46-1ubuntu1 | vulnerable |
| Ubuntu | libhtp | pro | 1:0.5.46-1ubuntu2 | vulnerable |
| Ubuntu | libhtp | pro | 1:0.5.46-1ubuntu2+esm1 | fixed |
| Ubuntu | libhtp | 25.10 | 1:0.5.49-1 | vulnerable |
| Ubuntu | libhtp | 25.10 | 1:0.5.50-1 | vulnerable |
| Ubuntu | libhtp | 26.04 | 1:0.5.50-1 | vulnerable |
| Ubuntu | libhtp | 26.04 | 1:0.5.52-1 | vulnerable |
| Ubuntu | libhtp | 26.04 | 1:0.5.52-2 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libhtp | source | trixie | 1:0.5.50-1+deb13u1 | not yet assigned | Not reported | [1109838] |
| Debian | libhtp | source | bookworm | Not affected | unimportant | Not reported | [1109838] |
| Ubuntu | libhtp | deb | noble | 1:0.5.46-1ubuntu2+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | libhtp-dev | deb | noble | 1:0.5.46-1ubuntu2+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | libhtp2 | deb | noble | 1:0.5.46-1ubuntu2+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | libhtp | deb | pro | 1:0.5.46-1ubuntu2+esm1 | Not reported | UBUNTU-CVE-2025-53537 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libhtp2]Not affected
Source package: [libhtp]
Details (4)
1:0.5.42-1+deb12u1· amd64 · bookwormNot affected
usn · libhtp · debian · bookworm
1:0.5.42-1+deb12u1· arm64 · bookwormNot affected
usn · libhtp · debian · bookworm
1:0.5.50-1+deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
usn · libhtp · debian · bookworm
1:0.5.50-1+deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
usn · libhtp · debian · bookworm
- [libhtp-dev]Not affected
Source package: [libhtp]
Details (4)
1:0.5.42-1+deb12u1· amd64 · bookwormNot affected
usn · libhtp · debian · bookworm
1:0.5.42-1+deb12u1· arm64 · bookwormNot affected
usn · libhtp · debian · bookworm
1:0.5.50-1+deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
usn · libhtp · debian · bookworm
1:0.5.50-1+deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
usn · libhtp · debian · bookworm
[Debian 13 (Trixie)]
- [libhtp2]Fixed
Source package: [libhtp]
Details (4)
1:0.5.50-1+deb13u1· amd64 · trixieFixed · Fixed:
1:0.5.50-1+deb13u1usn · libhtp · debian · 13
1:0.5.50-1+deb13u1· arm64 · trixieFixed · Fixed:
1:0.5.50-1+deb13u1usn · libhtp · debian · 13
1:0.5.53-1~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
1:0.5.50-1+deb13u1usn · libhtp · debian · 13
1:0.5.53-1~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
1:0.5.50-1+deb13u1usn · libhtp · debian · 13
- [libhtp-dev]Fixed
Source package: [libhtp]
Details (4)
1:0.5.50-1+deb13u1· amd64 · trixieFixed · Fixed:
1:0.5.50-1+deb13u1usn · libhtp · debian · 13
1:0.5.50-1+deb13u1· arm64 · trixieFixed · Fixed:
1:0.5.50-1+deb13u1usn · libhtp · debian · 13
1:0.5.53-1~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
1:0.5.50-1+deb13u1usn · libhtp · debian · 13
1:0.5.53-1~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
1:0.5.50-1+deb13u1usn · libhtp · debian · 13
Observed:
References
- [https://osv.dev/vulnerability/DEBIAN-CVE-2025-53537]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2025-53537]
- [https://security-tracker.debian.org/tracker/CVE-2025-53537]
- [https://ubuntu.com/security/notices/USN-7814-1]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Ubuntu Security Notices (USN)]