PT-2026-33882 · Openbao · Openbao

Published 2026-04-21 · Updated 2026-04-21 · CVE-2026-39396

Mitre

CVSS v3.1

3.1

Low

AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L

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.

Fix

Resource Exhaustion

Allocation of Resources Without Limits

Uncontrolled Recursion

Weakness Enumeration

CWE-400

CWE-770

CWE-674

Related Identifiers

CVE-2026-39396

Affected Products

Openbao

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-39396 · Security Note
• https://github.com/openbao/openbao/security/advisories/GHSA-r65v-xgwc-g56j · Note