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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| aio-libs | aiohttp | affected |
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Advisories
| Source | ID | Title |
|---|---|---|
 Github GHSA |
GHSA-cq5v-8q36-5273 | AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response) |
Fixes
Solution
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Workaround
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References
History
Mon, 03 Aug 2026 21:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response) | |
| Weaknesses | CWE-125 CWE-400 CWE-416 |
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| Metrics |
cvssV4_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-08-03T20:50:59.538Z
Reserved: 2026-08-03T19:54:19.852Z
Link: CVE-2026-69244
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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