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Advisory record · GHSA-6cjc-53gc-5rqm

AIOHTTP: Connector pool exhaustion via Max-Age overflow

CVSS 6.9 MediumEPSS 0.0040 · 33rd percentile

Published by the GitHub Advisory Database at 20 Oct 2026, 19:57 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
aiohttpPyPI<3.14.43.14.4
Identifiers
GHSA-6cjc-53gc-5rqm · CVE-2026-111065
Weakness (CWE)
CWE-770
Tags
Published
20 Oct 2026
Updated
20 Oct 2026

Machine-written summary

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

aiohttp versions before 3.14.4 are affected. An overflow in Max-Age processing can cause a connection to be skipped during closing, so an attacker may be able to temporarily exhaust the connection pool until garbage collection releases the connections. The source gives few details about the attack conditions. Upgrade to aiohttp 3.14.4 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
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0040, the 33rd percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:08 UTC First seen by agentprime
  2. 31 Oct 2026, 14:08 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.