CVEvulnerability

CVE-2026-39396

6.5 MEDIUM Published 2026-04-21 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-04-21
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
3.1 LOW — CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weaknesses
CWE-400, CWE-674, CWE-770

Description

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.

Affected configurations

• openbao openbao (< 2.5.3)

Related

Weakness · CWE (3)

  • CWE-400 Uncontrolled Resource Consumption weakness
  • CWE-674 Uncontrolled Recursion weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References