Resource Exhaustion Affecting openbao package, versions <2.5.3-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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-CHAINGUARDLATEST-OPENBAO-16188457
- published24 Apr 2026
- disclosed21 Apr 2026
Introduced: 21 Apr 2026
NewCVE-2026-39396 (opens in a new tab)How to fix?
Upgrade Chainguard openbao to version 2.5.3-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openbao package and not the openbao package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
OpenBao is an open source identity-based secrets management system. Prior to version 2.5.3, ExtractPluginFromImage() in OpenBao's OCI plugin downloader extracts a plugin binary from a container image by streaming decompressed tar data via io.Copy with no upper bound on the number of bytes written. An attacker who controls or compromises the OCI registry referenced in the victim's configuration can serve a crafted image containing a decompression bomb that decompresses to an arbitrarily large file. The SHA256 integrity check occurs after the full file is written to disk, meaning the hash mismatch is detected only after the damage (disk exhaustion) has already occurred. This allow the attacker to replace legit plugin image with no need to change its signature. Version 2.5.3 contains a patch.