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Advisory record · GHSA-p998-jp59-783m

AIOHTTP affected by UNC SSRF/NTLMv2 Credential Theft/Local File Read in static resource handler on Windows

CVSS 6.6 MediumEPSS 0.0045 · 39th percentile

Published by the GitHub Advisory Database at 1 Apr 2026, 21:26 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
aiohttpPyPI<3.13.43.13.4
Identifiers
GHSA-p998-jp59-783m · CVE-2026-34515 · PYSEC-2026-2097
Weakness (CWE)
CWE-36 · CWE-918
Tags
Published
1 Apr 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

aiohttp versions before 3.13.4 are affected. On Windows, the static resource handler may expose information about an NTLMv2 remote path. An attacker who can make requests to an application using this handler could potentially extract an NTLMv2 hash and then recover the user's credentials. Upgrade to aiohttp 3.13.4 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.6 Medium 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0045, the 39th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Mar 2026, 23:58 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:11 UTC First seen by agentprime
  3. 31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.