Vulnerability · Published Apr 1, 2026 · Assigned by GitHub_M
CVE-2026-34515AIOHTTP: UNC SSRF/NTLMv2 Credential Theft/Local File Read in static resource handler on Windows
Medium 6.6
In plain English
A medium-severity server-side request forgery in aiohttp from aio-libs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)6.6Medium
Exploit odds (30 days)0.4%top 60.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, on Windows the static resource handler may expose information about a NTLMv2 remote path. This issue has been patched in version 3.13.4.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | py3-aiohttp | 3.13.5-r0 | ALPINE-CVE-2026-34515 |
| Alpine:v3.24 | py3-aiohttp | 3.13.5-r0 | ALPINE-CVE-2026-34515 |
| PyPI | aiohttp | 3.13.4 | GHSA-p998-jp59-783m |
| PyPI | aiohttp | 3.13.4 | PYSEC-2026-2097 |
| Ubuntu:25.10 | python-aiohttp | no fix listed | UBUNTU-CVE-2026-34515 |
Affected products (as reported)
Weakness: CWE-36, CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-p998-jp59-783m x_refsource_CONFIRM
- https://github.com/aio-libs/aiohttp/commit/0ae2aa076c84573df83fc1fdc39eec0f5862fe3d x_refsource_MISC
- https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4 x_refsource_MISC