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Advisory record · GHSA-jm66-cg57-jjv5

Azure Core is vulnerable to deserialization of untrusted data

CVSS 7.5 HighEPSS 0.0095 · 61st percentile

Published by the GitHub Advisory Database at 13 Jan 2026, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
azure-corePyPI<1.38.01.38.0
Identifiers
GHSA-jm66-cg57-jjv5 · CVE-2026-21226 · PYSEC-2026-1208
Weakness (CWE)
CWE-502
Tags
Published
13 Jan 2026
Updated
10 Sept 2026

Machine-written summary

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

Azure Core, the shared client library for Python, is vulnerable to deserialization of untrusted data in versions before 1.38.0. An authorized attacker over a network can exploit this to execute code. Upgrade azure-core to version 1.38.0 or later.

Written 5 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
7.5 High 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.0095, the 61st percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:34 UTC First seen by agentprime
  2. 31 Oct 2026, 14:34 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.