kaml has potential denial of service while parsing input with anchors and aliases
Date: 2023-03
Affected: maven/com.charleskorn.kaml:kaml
Attack vector: dos
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2023-28118
CWE: CWE-776
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

### Impact Applications that use kaml to parse untrusted input containing anchors and aliases may consume excessive memory and crash. ### Patches Version 0.53.0 and later default to refusing to parse YAML documents containing anchors and aliases. ### Workarounds None. ### References Wikipedia has an explanation of this class of vulnerability: [billion laughs attack](https://en.wikipedia.org/wiki/Billion_laughs_attack) ### Acknowledgements Thank you to @gdude2002 for reporting this issue.


Mitigations:

Architectural layers (MAESTRO):