{"id":"CVE-2026-69244","aliases":["GHSA-cq5v-8q36-5273","PYSEC-2026-3545"],"url":"https://o3.security/vulnerability/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.","published":"2026-08-03T20:50:59.538Z","modified":"2026-09-13T18:26:39.711247967Z","cvss":null,"epss":{"score":0.003,"percentile":0.22636,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"aiohttp","fixedVersion":"3.14.3"}],"fix":{"url":"https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322d","label":"aio-libs/aiohttp@49f65d5"},"references":[{"type":"WEB","url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.14.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69244.json"},{"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"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322d"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/pull/13223"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-13T18:26:39.711247967Z"}}