libhtp2: LibHTP is a security-aware parser for the HTTP protocol and its relatedbits and pieces
CVE-2025-53537 is fixed in 2 products on 1 platform, first by libhtp2 1:0.5.26-1ubuntu0.1~esm1, released July 23, 2025. It is not reported as exploited. Patch Radar priority: High.
LibHTP is a security-aware parser for the HTTP protocol and its relatedbits and pieces. In versions 0.5.50 and below, there is a traffic-inducedmemory leak that can starve the process of memory, leading to loss ofvisibility. To workaround this issue, set `suricata.yamlapp-layer.protocols.http.libhtp.default-config.lzma-enabled` to false. Thisissue is fixed in version 0.5.51.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libhtp · Debian 13.5 (trixie) | 1:0.5.50-1+deb13u1 | DEBIAN-CVE-2025-53537 | Jul 23, 2025 |
| libhtp2 · Ubuntu 18.04.6 LTS (bionic) | 1:0.5.26-1ubuntu0.1~esm1 | libhtp2 1:0.5.26-1ubuntu0.1~esm1 | Jul 23, 2025 |
| libhtp2 · Ubuntu 20.04 LTS (focal) | 1:0.5.32-1ubuntu0.1~esm1 | libhtp2 1:0.5.32-1ubuntu0.1~esm1 | Jul 23, 2025 |
| libhtp2 · Ubuntu 22.04.1 LTS (jammy) | 1:0.5.39-1ubuntu0.1~esm1 | libhtp2 1:0.5.39-1ubuntu0.1~esm1 | Jul 23, 2025 |
| libhtp2 · Ubuntu 24.04.5 LTS (noble) | 1:0.5.46-1ubuntu2+esm1 | libhtp2 1:0.5.46-1ubuntu2+esm1 | Jul 23, 2025 |
| libhtp2 · Ubuntu 25.04 (plucky) | 1:0.5.49-1ubuntu0.1 | libhtp2 1:0.5.49-1ubuntu0.1 | Jan 16, 2026 |
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