Server-Side Request Forgery (SSRF) in aiohttp - CVE-2026-34515
Published: April 26, 2026
Vulnerability identifier: #VU127952
CSH Severity: Medium
CVSS v4.0: 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/U:Green
CVE-ID: CVE-2026-34515
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: aio-libs
Affected software:
aiohttp
aiohttp
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to server-side request forgery in the static resource handler on Windows when handling requests for static resources that reference a UNC path. A remote attacker can supply a crafted NTLMv2 remote path to disclose sensitive information.
This issue can expose NTLMv2 hash material and may also allow reading a local file on Windows systems.
How to mitigate CVE-2026-34515
Install security update from vendor's website.