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Advisory record · GHSA-8988-9cw3-xx77

urllib3: HTTPS proxy TLS configuration may be ignored or overridden

CVSS 7.6 HighEPSS 0.0021 · 10th percentile

Published by the GitHub Advisory Database at 30 Sept 2026, 14:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
urllib3PyPI>=1.26.0, <2.8.02.8.0
Identifiers
GHSA-8988-9cw3-xx77 · CVE-2026-97687 · PYSEC-2026-4175
Weakness (CWE)
CWE-295 · CWE-440
Tags
Published
30 Sept 2026
Updated
1 Oct 2026

Machine-written summary

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

Versions of urllib3 from 1.26.0 through 2.7.0 do not consistently separate TLS settings for an HTTPS proxy from those for the target server. An attacker who can intercept the connection to an HTTPS proxy may be able to impersonate it when proxy certificate verification is disabled or misapplied, and can then observe or modify forwarded traffic. Upgrade to urllib3 2.8.0 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
7.6 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0021, the 10th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 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.