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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OISF | libhtp | < 0.5.49 | — |
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 | 1:0.5.49-1 | — |
| Debian 12 | libhtp | 1:0.5.42-1+deb12u1 | — |
| Debian 11 | libhtp | 1:0.5.36-1+deb11u1 | DLA-4295-1 |
Ubuntu
Security tracker ↗| 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 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | suricata | 8.0.0-1.1 | openSUSE-SU-2025:15394-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | suricata | 7.0.7-r0 | — |
| Alpine v3.23 | suricata | 7.0.7-r0 | — |
| Alpine v3.22 | suricata | 7.0.7-r0 | — |
| Alpine v3.21 | suricata | 7.0.7-r0 | — |
| Alpine v3.20 | suricata | 7.0.7-r0 | — |
Advisories 3
- USN-7814-1 libhtp vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- openSUSE-SU-2025:15394-1 libsuricata8_0_0-8.0.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-4295-1 libhtp - security update Debian Security (DSA / DLA) · Mar 9, 2026