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Advisory record · GHSA-23x4-m842-fmwf

Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI-Generator online generator

CVSS 9.3 CriticalCriticalEPSS 0.0035 · 28th percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 11 May 2021, 00:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.openapitools:openapi-generator-onlineMaven<5.1.05.1.0
Identifiers
GHSA-23x4-m842-fmwf · CVE-2021-21428
Weakness (CWE)
CWE-269 · CWE-377 · CWE-378 · CWE-379 · CWE-668
Tags
Published
11 May 2021
Updated
8 Jul 2026

Machine-written summary

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

The openapi-generator-online package (Maven org.openapitools:openapi-generator-online) is vulnerable in versions before 5.1.0. On Unix-like systems, a local user on the same machine can race the creation of a temporary directory used during code generation, and then append to generated files, which can lead to local privilege escalation. Upgrade to version 5.1.0 or later.

Written 2 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
9.3 Critical 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 28th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 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.