{"id":"UBUNTU-CVE-2026-34513","details":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation. This issue has been patched in version 3.13.4.","modified":"2026-05-20T16:12:55.160945025Z","published":"2026-04-01T21:16:00Z","upstream":["CVE-2026-34513"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-34513"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-34513"},{"type":"REPORT","url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hcc4-c3v8-rx92"},{"type":"REPORT","url":"https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98"},{"type":"REPORT","url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4"}],"affected":[{"package":{"name":"python-aiohttp","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/python-aiohttp?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.17.2-1","0.17.4-1","0.17.4-1build1","0.20.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-aiohttp","binary_version":"0.20.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34513.json"}},{"package":{"name":"python-aiohttp","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.3-1build1","2.2.3-2","2.3.6-1","3.0.1-1","3.0.1-1ubuntu0.1~esm1","3.0.1-1ubuntu0.1~esm4","3.0.1-1ubuntu0.1~esm5","3.0.1-1ubuntu0.1~esm6"],"ecosystem_specific":{"binaries":[{"binary_version":"3.0.1-1ubuntu0.1~esm6","binary_name":"python3-aiohttp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34513.json"}},{"package":{"name":"python-aiohttp","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5.4-1","3.5.4-1build1","3.6.1-1","3.6.2-1","3.6.2-1build1","3.6.2-1ubuntu0.1~esm1","3.6.2-1ubuntu1","3.6.2-1ubuntu1+esm1","3.6.2-1ubuntu1+esm3","3.6.2-1ubuntu1+esm4","3.6.2-1ubuntu1+esm5"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-aiohttp","binary_version":"3.6.2-1ubuntu1+esm5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34513.json"}},{"package":{"name":"python-aiohttp","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.7.4-1","3.7.4-1build2","3.8.1-3","3.8.1-4","3.8.1-4build1","3.8.1-4ubuntu0.2","3.8.1-4ubuntu0.2+esm1","3.8.1-4ubuntu0.2+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"3.8.1-4ubuntu0.2+esm2","binary_name":"python3-aiohttp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34513.json"}},{"package":{"name":"python-aiohttp","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.8.4-1","3.9.1-1","3.9.1-1build1","3.9.1-1ubuntu0.1","3.9.1-1ubuntu0.1+esm1","3.9.1-1ubuntu0.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"3.9.1-1ubuntu0.1+esm2","binary_name":"python3-aiohttp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34513.json"}},{"package":{"name":"python-aiohttp","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/python-aiohttp?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.10.11-1build1","3.11.16-1","3.11.16-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.11.16-1ubuntu0.1","binary_name":"python3-aiohttp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34513.json"}},{"package":{"name":"python-aiohttp","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/python-aiohttp?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.11.16-1","3.13.1-1","3.13.3-3","3.13.3-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.13.3-3ubuntu1","binary_name":"python3-aiohttp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34513.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"},{"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"}]}