Asymmetric Resource Consumption (Amplification) Affecting runfinch-finch package, versions <0:1.10.0-1.amzn2023.0.6


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.02% (5th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-AMZN2023-RUNFINCHFINCH-14903527
  • published9 Jan 2026
  • disclosed4 Dec 2025

Introduced: 4 Dec 2025

CVE-2025-66564  (opens in a new tab)
CWE-405  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 runfinch-finch to version 0:1.10.0-1.amzn2023.0.6 or higher.
This issue was patched in ALAS2023-2025-1336.

NVD Description

Note: Versions mentioned in the description apply only to the upstream runfinch-finch package and not the runfinch-finch package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.0.3, Function api.ParseJSONRequest currently splits (via a call to strings.Split) an optionally-provided OID (which is untrusted data) on periods. Similarly, function api.getContentType splits the Content-Type header (which is also untrusted data) on an application string. As a result, in the face of a malicious request with either an excessively long OID in the payload containing many period characters or a malformed Content-Type header, a call to api.ParseJSONRequest or api.getContentType incurs allocations of O(n) bytes (where n stands for the length of the function's argument). This vulnerability is fixed in 2.0.3.

CVSS Base Scores

version 3.1