{"id":"UBUNTU-CVE-2023-30847","details":"H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request  number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.","modified":"2026-04-22T14:06:08.992855Z","published":"2023-04-27T15:15:00Z","upstream":["CVE-2023-30847"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-30847"},{"type":"REPORT","url":"https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx"},{"type":"REPORT","url":"https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33"},{"type":"REPORT","url":"https://github.com/h2o/h2o/pull/3229"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-30847"}],"affected":[{"package":{"name":"h2o","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/h2o@2.2.4+dfsg-1ubuntu0.1~esm2?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.3+dfsg-2","2.2.4+dfsg-1","2.2.4+dfsg-1build1","2.2.4+dfsg-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"h2o","binary_version":"2.2.4+dfsg-1ubuntu0.1~esm2"},{"binary_name":"libh2o-dev-common","binary_version":"2.2.4+dfsg-1ubuntu0.1~esm2"},{"binary_name":"libh2o-evloop0.13","binary_version":"2.2.4+dfsg-1ubuntu0.1~esm2"},{"binary_name":"libh2o0.13","binary_version":"2.2.4+dfsg-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-30847.json"}},{"package":{"name":"h2o","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/h2o@2.2.5+dfsg2-3ubuntu0.1~esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.5+dfsg2-3","2.2.5+dfsg2-3build1","2.2.5+dfsg2-3ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"h2o","binary_version":"2.2.5+dfsg2-3ubuntu0.1~esm1"},{"binary_name":"libh2o-dev-common","binary_version":"2.2.5+dfsg2-3ubuntu0.1~esm1"},{"binary_name":"libh2o-evloop0.13","binary_version":"2.2.5+dfsg2-3ubuntu0.1~esm1"},{"binary_name":"libh2o0.13","binary_version":"2.2.5+dfsg2-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-30847.json"}},{"package":{"name":"h2o","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/h2o@2.2.5+dfsg2-6.1ubuntu2+esm1?arch=source&distro=esm-apps/jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.5+dfsg2-6","2.2.5+dfsg2-6.1","2.2.5+dfsg2-6.1ubuntu1","2.2.5+dfsg2-6.1ubuntu2","2.2.5+dfsg2-6.1ubuntu2+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.5+dfsg2-6.1ubuntu2+esm1","binary_name":"h2o"},{"binary_name":"libh2o-dev-common","binary_version":"2.2.5+dfsg2-6.1ubuntu2+esm1"},{"binary_name":"libh2o-evloop0.13","binary_version":"2.2.5+dfsg2-6.1ubuntu2+esm1"},{"binary_name":"libh2o0.13","binary_version":"2.2.5+dfsg2-6.1ubuntu2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-30847.json"}},{"package":{"name":"h2o","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/h2o@2.2.5+dfsg2-8.1ubuntu3?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.5+dfsg2-7","2.2.5+dfsg2-8","2.2.5+dfsg2-8.1ubuntu1","2.2.5+dfsg2-8.1ubuntu2","2.2.5+dfsg2-8.1ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"h2o","binary_version":"2.2.5+dfsg2-8.1ubuntu3"},{"binary_name":"libh2o-dev-common","binary_version":"2.2.5+dfsg2-8.1ubuntu3"},{"binary_name":"libh2o-evloop0.13t64","binary_version":"2.2.5+dfsg2-8.1ubuntu3"},{"binary_version":"2.2.5+dfsg2-8.1ubuntu3","binary_name":"libh2o0.13t64"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-30847.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:L/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}