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Advisory record · GHSA-fmm9-3gv8-58f4

Improper Handling of Missing Values in kaml

CVSS 4.3 MediumEPSS 0.017 · 76th percentile

Published by the GitHub Advisory Database at 7 Sept 2021, 23:08 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.charleskorn.kaml:kamlMaven<0.35.30.35.3
Identifiers
GHSA-fmm9-3gv8-58f4 · CVE-2021-39194
Weakness (CWE)
CWE-230 · CWE-835
Tags
Published
7 Sept 2021
Updated
8 Jul 2026

Machine-written summary

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

The kaml library (Maven com.charleskorn.kaml:kaml) versions before 0.35.3 are affected. An attacker who can supply arbitrary YAML input to an application that uses polymorphic serialization with the default tagged style can cause parsing to loop endlessly, leading to resource starvation and denial of service. Upgrade to kaml 0.35.3 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
4.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.017, the 76th 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.