VDB-368052 · CVE-2026-47265 · GHSA-hg6j-4rv6-33pg

aio-libs aiohttp up to 3.13.x cookies origin validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	0.99

Summaryinfo

A vulnerability was found in aio-libs aiohttp up to 3.13.x. It has been declared as problematic. This vulnerability affects unknown code. The manipulation of the argument cookies results in origin validation. This vulnerability is reported as CVE-2026-47265. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in aio-libs aiohttp up to 3.13.x. It has been classified as problematic. Affected is some unknown processing. The manipulation of the argument cookies with an unknown input leads to a origin validation vulnerability. CWE is classifying the issue as CWE-346. The product does not properly verify that the source of data or communication is valid. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-47265 since 05/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 3.14.0 eliminates this vulnerability. Applying the patch f54c40851b0d6c4bbdab97ba518a223adda32478 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-34007). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

aio-libs

Name

aiohttp

Version

License

open-source

Website

Product: https://github.com/aio-libs/aiohttp/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Origin validation
CWE: CWE-346 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: aiohttp 3.14.0
Patch: f54c40851b0d6c4bbdab97ba518a223adda32478

Timelineinfo

05/19/2026 CVE reserved
06/02/2026 +14 days VulDB entry created
06/03/2026 +0 days Advisory disclosed
06/04/2026 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-hg6j-4rv6-33pg
Status: Confirmed

CVE: CVE-2026-47265 (🔒)
GCVE (CVE): GCVE-0-2026-47265
GCVE (VulDB): GCVE-100-368052
EUVD: 🔒

Entryinfo

Created: 06/03/2026 01:42
Updated: 06/04/2026 04:40
Changes: 06/03/2026 01:42 (70), 06/04/2026 04:40 (1)
Complete: 🔍
Cache ID: 216::103