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.
1:0.5.49-11:0.5.50-11:0.5.50-11:0.5.52-11:0.5.52-20.5.15-1ubuntu0.1~esm11:0.5.26-1ubuntu0.1~esm11:0.5.32-1ubuntu0.1~esm11:0.5.39-1ubuntu0.1~esm11:0.5.46-1ubuntu2+esm1Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:NA:HCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H