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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
5.3MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 74.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

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
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Weaknesses

CWE-200NVD-CWE-noinfo

Affected Products

aiohttp
oss-project
aiohttpLibrary
OSS Libraries / web-framework
aio-libs
oss-projectaka aiohttp, aiohttp session, aiosmtpd
aiohttpLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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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
News mentions
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