{"id":"CVE-2026-69244","summary":"AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)","details":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3.","aliases":["GHSA-cq5v-8q36-5273","PYSEC-2026-3545"],"modified":"2026-08-04T21:26:59.120506879Z","published":"2026-08-03T20:50:59.538Z","related":["CGA-q2x7-428q-vmjp"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-125","CWE-400","CWE-416"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69244.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69244.json"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322d"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/pull/13223"},{"type":"WEB","url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.14.3"},{"type":"ADVISORY","url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-cq5v-8q36-5273"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-69244"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/aio-libs/aiohttp","events":[{"introduced":"0"},{"fixed":"5e392ce0456f5235a4ee6ad46f0e806df2f15873"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"3.14.3"}]}}],"versions":["v3.14.2","v3.14.1","v3.14.0","v3.13.0","v3.12.0","v3.12.0rc1","v3.12.0rc0","v3.12.0b3","v3.12.0b2","v3.12.0b1","v3.12.0b0","v3.11.0","v3.11.0rc2","v3.11.0rc1","v3.11.0rc0","v3.11.0b5","v3.11.0b4","v3.11.0b3","v3.11.0b2","v3.11.0b1","v3.11.0b0","v3.10.0","v3.10.0rc0","v3.10.0b1","v3.10.0b0","v3.9.0","v3.9.0rc0","v3.9.0b1","v3.9.0b0","v3.8.0","v3.7.1","v3.7.0","v3.7.0b1","v3.7.0b0","v3.6.2","v3.6.2a2","v3.6.2a1","v3.6.1","v3.6.1b4","v3.6.1b3","v3.6.0","v3.6.0b0","v3.6.0a12","v3.6.0a11","v3.6.0a10","v3.6.0a9","v3.6.0a8","v3.6.0a7","v3.6.0a6","v3.6.0a5","v3.6.0a4","v3.6.0a3","v3.6.0a2","v3.6.0a1","v3.6.0a0","v3.5.4","v3.5.3","v3.5.2","v3.5.1","v3.5.0","v3.5.0b3","v3.5.0b2","v3.5.0b1","v3.5.0a1","v3.4.0","v3.4.0b2","v3.4.0b1","v3.4.0a3","v3.4.0a0","v3.2.0","v3.1.0","v3.0.0b4","v3.0.0b3","v3.0.0b2","v3.0.0b1","v3.0.0b0","v2.3.0","v2.3.0a4","v2.3.0a3","v2.3.0a2","v2.3.0a1","v2.2.0","v2.1.0","2.0.0","2.0.0rc1","1.3.0","v1.2.0","v1.1.1","v1.1.0","v1.0.1","v1.0.0","v0.22.1","v0.22.0","v0.22.0b6","v0.22.0b5","v0.22.0b4","v0.22.0b3","v0.22.0b2","v0.22.0b1","v0.22.0b0","4v0.21.6","v0.21.0","v0.20.1","v0.20.0","v0.19.0","v0.18.0","v0.17.0","v0.16.3","v0.16.2","v0.16.1","v0.16.0","v0.15.3","0.15.2","v0.15.2","v0.15.1","v0.15.0","v0.14.4","v0.14.3","v0.14.2","v0.14.1","v0.14.0","v0.13.1","v0.13.0","v0.12.0","v0.11.0","v0.10.1","v0.10.0","v0.9.2","v0.9.1","v0.9.0","v0.8.4","v0.8.3","0.8.2","v0.8.1","v0.8.0","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v.0.6.5","v0.6.4","v0.6.3","v0.6.2","v0.6.1","v0.5.0","v0.4.2","v0.4.1","v0.4","v0.3","v0.2","v0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-69244.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}