CVE-2026-59868

Aliases:GHSA-g796-fgmg-93mv
Advisory lineage Upstream: 0 Downstream: 9
Analyzed
Published: 08 Jul 2026, 15:18
Last modified:09 Jul 2026, 13:42

Vulnerability Summary

Overall Risk (default)
medium
40/100
CVSS Score
7.5 HIGH
v3.1 (nvd)
EPSS Score
0.64% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

08 Jul 2026, 15:18
Published
Vulnerability first disclosed
09 Jul 2026, 13:42
Last Modified
Vulnerability information updated

Description

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in version 5.2.0.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.64%• Percentile: 49%

Techniques & Countermeasures

  • CWE-407•Inefficient Algorithmic Complexity

    An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

  • CWE-770•Allocation of Resources Without Limits or Throttling

    The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Affected Systems

  • nodeca•js-yaml

    ≥ 5.0.0, < 5.2.0

  • Npm•js-yaml

    ≥ 5.0.0, < 5.2.0

References (5)