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aiohttp CVE-2026-47265

| EUVDEUVD-2026-34007 MEDIUM
Origin Validation Error (CWE-346)
2026-06-02 GitHub_M GHSA-hg6j-4rv6-33pg
Information Disclosure Python
6.6
CVSS 4.0 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
6.6 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
SUSE
5.3 MEDIUM
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Red Hat
6.5 MEDIUM
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Jun 02, 2026 - 21:02 EUVD
Source Code Evidence Fetched
Jun 02, 2026 - 20:28 vuln.today
Analysis Generated
Jun 02, 2026 - 20:28 vuln.today
CVSS changed
Jun 02, 2026 - 20:22 NVD
6.6 (MEDIUM)

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 16 pypi packages depend on aiohttp (13 direct, 3 indirect)

Ecosystem-wide dependent count for version 3.14.0.

DescriptionGitHub Advisory

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the cookies parameter on requests are sent after following a cross-origin redirect. If a developer uses the cookies parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect. Version 3.14.0 patches the issue. If unable to upgrade, using a Cookie header in the headers parameter is not vulnerable.

AnalysisAI

Cross-origin cookie leakage in aiohttp prior to 3.14.0 allows sensitive per-request cookies to be forwarded to attacker-controlled domains when a redirect is followed. When application code passes cookies via the cookies parameter of an aiohttp request, those cookies are not dropped upon following a cross-origin redirect - violating the origin isolation guarantee users expect. An attacker who can influence redirect responses (e.g., via a compromised or malicious upstream server) can harvest cookie values intended only for the original origin. No public exploit identified at time of analysis; EPSS data not provided in source intelligence.

Technical ContextAI

aiohttp (cpe:2.3:a:aio-libs:aiohttp:*:*:*:*:*:*:*:*) is a widely used asyncio-based HTTP client/server library for Python. The vulnerability is rooted in CWE-346 (Origin Validation Error): the client's redirect-following logic in aiohttp/client.py failed to clear the per-request cookies argument when the redirect target crossed an origin boundary. Browser-standard behavior dictates that cookies scoped to an origin must not be forwarded to a different origin on redirect. The fix, introduced in commit f54c40851b0d6c4bbdab97ba518a223adda32478, adds a single assignment cookies = None in the redirect path to enforce this boundary. Notably, cookies passed via the headers parameter (as a raw Cookie: header) were already being dropped on cross-origin redirects by the general header-stripping logic - only the dedicated cookies parameter was affected.

RemediationAI

Upgrade aiohttp to version 3.14.0 or later, which patches the issue by nullifying per-request cookies before following cross-origin redirects (vendor-released patch: 3.14.0; upstream fix at https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478). If upgrading is not immediately possible, the documented workaround is to pass cookies as a raw Cookie header via the headers parameter rather than the cookies parameter - e.g., headers={'Cookie': 'session=abc123'} instead of cookies={'session': 'abc123'}. This workaround is effective because aiohttp's general header-stripping logic already drops custom headers on cross-origin redirects, making it safe. The trade-off is that using raw Cookie headers bypasses aiohttp's cookie serialization and jar integration, which may require minor code adjustments. Additionally, applications can disable automatic redirect following (allow_redirects=False) and handle redirects manually, though this is a more invasive change.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Public Cloud 15 SP7 Fixed
SUSE Linux Enterprise Module for Python 3 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed

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CVE-2026-47265 vulnerability details – vuln.today
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