Vulnerability · Published Oct 19, 2026 · Assigned by GitHub_M

CVE-2026-111063AIOHTTP: Secure attribute not enforced for shared cookie

Medium 6.3

In plain English

A medium-severity security flaw in aiohttp from aio-libs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.2%top 85.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the Secure attribute for a shared cookie is not enforced. An attacker can consequently cause a shared cookie marked Secure to be sent with an unencrypted request. This issue is fixed in version 3.14.4.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	python-aiohttp	no fix listed	DEBIAN-CVE-2026-111063
Debian:13	python-aiohttp	no fix listed	DEBIAN-CVE-2026-111063
Debian:14	python-aiohttp	no fix listed	DEBIAN-CVE-2026-111063
PyPI	aiohttp	3.14.4	GHSA-494j-54xm-rwp3
Ubuntu:26.10	python-aiohttp	no fix listed	UBUNTU-CVE-2026-111063

Affected products (as reported)

Vendor	Product	Versions
aio-libs	aiohttp	< 3.14.4

Weakness: CWE-311, CWE-1004 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-494j-54xm-rwp3 x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/999c356d61e966faffa97b06ab0d0455226d36c5 x_refsource_MISC
https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4 x_refsource_MISC