CVE-2026-56854 Affecting tbot package, versions <18.11.0-r1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.33% (25th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-TBOT-19430438
  • published30 Aug 2026
  • disclosed28 Aug 2026

Introduced: 28 Aug 2026

NewCVE-2026-56854  (opens in a new tab)

How to fix?

Upgrade Chainguard tbot to version 18.11.0-r1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tbot package and not the tbot package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.

CVSS Base Scores

version 3.1