{"id":"UBUNTU-CVE-2025-53537","details":"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.","modified":"2026-05-20T16:11:25.750144669Z","published":"2025-07-23T21:15:00Z","related":["USN-7814-1"],"upstream":["CVE-2025-53537"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-53537"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-53537"},{"type":"REPORT","url":"https://github.com/OISF/libhtp/security/advisories/GHSA-v3qq-h8mh-vph7"},{"type":"REPORT","url":"https://github.com/OISF/libhtp/commit/9037ea35110a0d97be5cedf8d31fb4cd9a38c7a7"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7814-1"}],"affected":[{"package":{"name":"libhtp","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libhtp?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.15-1ubuntu0.1~esm1"}]}],"versions":["0.5.15-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.5.15-1ubuntu0.1~esm1","binary_name":"libhtp1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-53537.json"}},{"package":{"name":"libhtp","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libhtp?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:0.5.26-1ubuntu0.1~esm1"}]}],"versions":["1:0.5.25-1","1:0.5.26-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libhtp2","binary_version":"1:0.5.26-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-53537.json"}},{"package":{"name":"libhtp","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libhtp?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:0.5.32-1ubuntu0.1~esm1"}]}],"versions":["1:0.5.30-1","1:0.5.31-1","1:0.5.32-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libhtp2","binary_version":"1:0.5.32-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-53537.json"}},{"package":{"name":"libhtp","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/libhtp?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:0.5.39-1ubuntu0.1~esm1"}]}],"versions":["1:0.5.36-1","1:0.5.38-1","1:0.5.39-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libhtp2","binary_version":"1:0.5.39-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-53537.json"}},{"package":{"name":"libhtp","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/libhtp?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:0.5.46-1ubuntu2+esm1"}]}],"versions":["1:0.5.45-1","1:0.5.46-1ubuntu1","1:0.5.46-1ubuntu2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libhtp2","binary_version":"1:0.5.46-1ubuntu2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-53537.json"}},{"package":{"name":"libhtp","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libhtp?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.5.49-1","1:0.5.50-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libhtp2","binary_version":"1:0.5.50-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-53537.json"}},{"package":{"name":"libhtp","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libhtp?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.5.50-1","1:0.5.52-1","1:0.5.52-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libhtp2","binary_version":"1:0.5.52-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-53537.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}