kaml has potential denial of service while parsing input with anchors and aliases

高 7.5CVE-2023-28118 · GHSA-c24f-2j3g-rg48 · 20/03/2023 公開 · 17/06/2026 更新

要点

CVE-2023-28118 は com.charleskorn.kaml:kaml, kaml (kaml project) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.97%（全脆弱性の 62.2% より高い）。
対処：0.53.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
com.charleskorn.kaml:kaml Maven	`< 0.53.0`	`0.53.0`
kaml kaml_project	`< 0.53.0`	`0.53.0`

概要

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

Acknowledgements

Thank you to @gdude2002 for reporting this issue.

NVD の説明

kaml provides YAML support for kotlinx.serialization. Prior to version 0.53.0, applications that use kaml to parse untrusted input containing anchors and aliases may consume excessive memory and crash. Version 0.53.0 and later default to refusing to parse YAML documents containing anchors and aliases. There are no known workarounds.