HOMEVULNERABILITIESCVE-2026-34518
LOW

CVE-2026-34518

CWE-200Published: April 1, 2026· Updated: Apr 3, 2026

2.7
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:12.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34518 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeX
Impact
Confidentiality
Integrity
Availability
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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

Affected Vendors & Products

Mentioned vendors (from description):
Python
CPE data not yet available in NVD for this CVE.

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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All References (3)

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

Quick Facts

CVE IDCVE-2026-34518
CVSS Score2.7 / 10
SeverityLOW
WeaknessCWE-200
CISA KEVNo
EPSS (30d)0.04%
PublishedApr 1, 2026

Related CVEs (CWE-200)

CVE-2026-40965
10.0
CVE-2026-27604
10.0
CVE-2026-21515
9.9
CVE-2026-54305
9.9
CVE-2026-28213
9.8
CVE-2026-40498
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-34518 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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