CVE-2026-59881

A flaw was found in AIOHTTP. The WebSocket client in AIOHTTP processes compressed data frames even when the compression mechanism, known as permessage-deflate, has not been properly negotiated. A malicious server can exploit this by sending specially crafted compressed frames. This can lead to...

CVE-2026-29035

A flaw was found in CivetWeb. An unauthenticated remote attacker could exploit a heap and stack buffer overflow vulnerability by sending specially crafted compressed WebSocket frames. This could lead to memory corruption, potentially resulting in denial of service or arbitrary code execution. The...

DEBIAN-CVE-2026-29035

CivetWeb commit 4a4f0c95 contains a heap and stack buffer overflow vulnerability in the readwebsocket function that allows unauthenticated remote attackers to corrupt memory by sending compressed WebSocket frames when both USEZLIB and MGEXPERIMENTALINTERFACES are defined. Attackers can negotiate...

UBUNTU-CVE-2026-29035

CivetWeb commit 4a4f0c95 contains a heap and stack buffer overflow vulnerability in the readwebsocket function that allows unauthenticated remote attackers to corrupt memory by sending compressed WebSocket frames when both USEZLIB and MGEXPERIMENTALINTERFACES are defined. Attackers can negotiate...

CVE-2026-29035 CivetWeb Heap/Stack Buffer Overflow via WebSocket permessage-deflate Decompression

CivetWeb commit 4a4f0c95 contains a heap and stack buffer overflow vulnerability in the readwebsocket function that allows unauthenticated remote attackers to corrupt memory by sending compressed WebSocket frames when both USEZLIB and MGEXPERIMENTALINTERFACES are defined. Attackers can negotiate...

CVE-2026-29035 CivetWeb Heap/Stack Buffer Overflow via WebSocket permessage-deflate Decompression

CivetWeb commit 4a4f0c95 contains a heap and stack buffer overflow vulnerability in the readwebsocket function that allows unauthenticated remote attackers to corrupt memory by sending compressed WebSocket frames when both USEZLIB and MGEXPERIMENTALINTERFACES are defined. Attackers can negotiate...

CVE-2026-29035

CVE-2026-29035 affects CivetWeb (commit 4a4f0c95) and describes a heap and stack buffer overflow in read_websocket() when both USE_ZLIB and MG_EXPERIMENTAL_INTERFACES are defined. An unauthenticated remote attacker can exploit this via compressed WebSocket frames negotiated with permessage-deflat...

OESA-2026-3279 python-aiohttp security update

Async http client/server framework asyncio. Security Fixes: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated,...

OESA-2026-3278 python-aiohttp security update

Async http client/server framework asyncio. Security Fixes: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated,...

AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

SummaryThe client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated. ImpactA client may unexpectedly decompress WebSocket frames when explicitly opted out. This could lead to additional CPU/memory consumption, but is unlikely to be...

PYSEC-2026-3547 AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

Summary The client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated. Impact A client may unexpectedly decompress WebSocket frames when explicitly opted out. This could lead to additional CPU/memory consumption, but is unlikely to ...

EUVD-2026-51257

AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate...

AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

Summary The client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated. Impact A client may unexpectedly decompress WebSocket frames when explicitly opted out. This could lead to additional CPU/memory consumption, but is unlikely to ...

GHSA-MQ44-7P77-Q5H7 AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

Summary The client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated. Impact A client may unexpectedly decompress WebSocket frames when explicitly opted out. This could lead to additional CPU/memory consumption, but is unlikely to ...

SUSE CVE-2026-59881

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory...

AZL-94397 CVE-2026-59881 affecting package python-aiohttp 3.6.2-3

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory...

CVE-2026-59881 AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory...

CVE-2026-59881 AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory...

CVE-2026-59881 AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory...

CVE-2026-59881

AIOHTTP WebSocket client vulnerability: before 3.14.2, the client accepts and decompresses frames with RSV1 set even when permessage-deflate was not negotiated, enabling potential CPU and memory overuse by a malicious server. Affected: AIOHTTP (WebSocket client). Root cause: decompressing frames ...