Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OISF | libhtp | < 0.5.51 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | libhtp | 1:0.5.50-1+deb13u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libhtp | No fix yet | — |
| Ubuntu 25.10 | libhtp | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | libhtp | 1:0.5.46-1ubuntu2+esm1 | USN-7814-1 |
| Ubuntu Pro 22.04 LTS | libhtp | 1:0.5.39-1ubuntu0.1~esm1 | USN-7814-1 |
| Ubuntu Pro 20.04 LTS | libhtp | 1:0.5.32-1ubuntu0.1~esm1 | USN-7814-1 |
| Ubuntu Pro 18.04 LTS | libhtp | 1:0.5.26-1ubuntu0.1~esm1 | USN-7814-1 |
| Ubuntu Pro 16.04 LTS | libhtp | 0.5.15-1ubuntu0.1~esm1 | USN-7814-1 |
Advisories 1
- USN-7814-1 libhtp vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026