Logging of Excessive Data

Overview Affected versions of this package are vulnerable to Logging of Excessive Data via the cookies attribute. An attacker can generate excessive warning-level log entries by sending specially crafted Cookie headers. Remediation Upgrade aiohttp to version 3.13.3 or higher. References - GitHub...

GHSA-G84X-MCQJ-X9QQ AIOHTTP vulnerable to DoS through chunked messages

Summary Handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. Impact If an application makes use of the request.read method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the request.read method. An attacker can cause the server to consume excessive CPU resources by sending a large number of chunked messages. Details Denial of Service DoS describes ...

AIOHTTP vulnerable to DoS through chunked messages

Summary Handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. Impact If an application makes use of the request.read method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU...

EUVD-2026-1044

AIOHTTP vulnerable to denial of service through large payloads...

AIOHTTP vulnerable to denial of service through large payloads

Summary A request can be crafted in such a way that an aiohttp server's memory fills up uncontrollably during processing. Impact If an application includes a handler that uses the Request.post method, an attacker may be able to freeze the server by exhausting the memory. ----- Patch:...

GHSA-6JHG-HG63-JVVF AIOHTTP vulnerable to denial of service through large payloads

Summary A request can be crafted in such a way that an aiohttp server's memory fills up uncontrollably during processing. Impact If an application includes a handler that uses the Request.post method, an attacker may be able to freeze the server by exhausting the memory. ----- Patch:...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the Request.post function. An attacker can cause the server to exhaust available memory and become unresponsive. Details Denial of Service DoS describes a family of attacks, all...

GHSA-JJ3X-WXRX-4X23 AIOHTTP vulnerable to DoS when bypassing asserts

Summary When assert statements are bypassed, an infinite loop can occur, resulting in a DoS attack when processing a POST body. Impact If optimisations are enabled -O or PYTHONOPTIMIZE=1, and the application includes a handler that uses the Request.post method, then an attacker may be able to...

Infinite loop

Overview Affected versions of this package are vulnerable to Infinite loop in the Request.post function. An attacker can cause the application to exhaust system resources by sending a POST request. Note: This is only exploitable if Python optimizations are enabled using the -O flag or setting...

EUVD-2026-1045

AIOHTTP vulnerable to DoS when bypassing asserts...

AIOHTTP vulnerable to DoS when bypassing asserts

Summary When assert statements are bypassed, an infinite loop can occur, resulting in a DoS attack when processing a POST body. Impact If optimisations are enabled -O or PYTHONOPTIMIZE=1, and the application includes a handler that uses the Request.post method, then an attacker may be able to...

EUVD-2026-1046

AIOHTTP vulnerable to brute-force leak of internal static file path components...

Information Exposure

Overview Affected versions of this package are vulnerable to Information Exposure over the /static endpoint. An attacker can determine the existence of internal path components by sending requests to probe for absolute path elements. Remediation Upgrade aiohttp to version 3.13.3 or higher...

GHSA-54JQ-C3M8-4M76 AIOHTTP vulnerable to brute-force leak of internal static file path components

Summary Path normalization for static files prevents path traversal, but opens up the ability for an attacker to ascertain the existence of absolute path components. Impact If an application uses web.static not recommended for production deployments, it may be possible for an attacker to ascertai...

AIOHTTP vulnerable to brute-force leak of internal static file path components

Summary Path normalization for static files prevents path traversal, but opens up the ability for an attacker to ascertain the existence of absolute path components. Impact If an application uses web.static not recommended for production deployments, it may be possible for an attacker to ascertai...

GHSA-MQQC-3GQH-H2X8 AIOHTTP has unicode match groups in regexes for ASCII protocol elements

Summary The parser allows non-ASCII decimals to be present in the Range header. Impact There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. ---- Patch:...

HTTP Request Smuggling

Overview Affected versions of this package are vulnerable to HTTP Request Smuggling via the parsing of Range headers. An attacker can potentially interfere with HTTP request processing by supplying non-ASCII decimals in the header, which may lead to unexpected parser mismatches. Remediation Upgra...

EUVD-2026-1047

AIOHTTP has unicode match groups in regexes for ASCII protocol elements...

AIOHTTP has unicode match groups in regexes for ASCII protocol elements

Summary The parser allows non-ASCII decimals to be present in the Range header. Impact There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. ---- Patch:...