CVE-2026-69244AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)
Updated under an hour ago ()
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It affects aio-libs aiohttp. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-400, CWE-416, CWE-125
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Aug 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
aio-libs aiohttp aio_libs:aiohttp (from the name) | before 3.14.3 | CNA record |
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-cq5v-8q36-5273x-refsource-confirm
- https://github.com/aio-libs/aiohttp/pull/13223x-refsource-misc
- https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322dx-refsource-misc
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.3x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.