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Advisory record · GHSA-f9xw-jh8m-3mwq

AIOHTTP: Absolute-form request targets can spoof Request.scheme

CVSS 6.3 MediumEPSS 0.0039 · 32nd percentile

Published by the GitHub Advisory Database at 20 Oct 2026, 20:01 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-f9xw-jh8m-3mwq · CVE-2026-111748
Weakness (CWE)
CWE-807
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 attacker who sends a request in absolute form can spoof the scheme reported by Request.scheme, which may cause application code that relies on it for security decisions to treat an unencrypted connection as encrypted, or the reverse. Upgrade to aiohttp 3.14.4. If upgrading is not possible, a web application firewall rule that rejects absolute-form request targets is a possible workaround.

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
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0039, the 32nd percentile, on 6 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.