CVE Tools
Sign in

CVE-2026-34518

AIOHTTP: Cookie and Proxy-Authorization headers leaked on cross-origin redirect

Published: Apr 1, 2026Updated: Apr 16, 2026 Sources: CVE List NVDCWE-200
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 74.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, when following redirects to a different origin, aiohttp drops the Authorization header, but retains the Cookie and Proxy-Authorization headers. This issue has been patched in version 3.13.4.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-200NVD-CWE-noinfo

Affected Products

aiohttpaiohttp
Library
OSS Libraries / web-framework
aiohttpaio-libs
Library
OSS Libraries / web-framework
aiohttposs-projectOSS Libraries
aio-libsoss-projectOSS Librariesaka aiohttp, aiosmtpd, aiohttp session

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://github.com/aio-libs/aiohttp/commit/5351c980dcec7ad385730efdf4e1f4338b24fdb6
github.com
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
github.com
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-966j-vmvw-g2g9
github.com

Timeline

Published
Apr 1, 2026
Last Updated
Apr 16, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-34518 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows