Deserialization of Untrusted Data Affecting runfinch-finch package, versions <0:1.17.1-1.amzn2023.0.2


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.33% (25th percentile)

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  • Snyk IDSNYK-AMZN2023-RUNFINCHFINCH-17288878
  • published10 Jun 2026
  • disclosed22 May 2026

Introduced: 22 May 2026

NewCVE-2026-39832  (opens in a new tab)
CWE-502  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 runfinch-finch to version 0:1.17.1-1.amzn2023.0.2 or higher.
This issue was patched in ALAS2023-2026-1809.

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.

When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.

CVSS Base Scores

version 3.1