CVE-2026-39396

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.

• CWE-400
• CWE-674
• CWE-770

• https://github.com/openbao/openbao/security/advisories/GHSA-r65v-xgwc-g56jExploit, Vendor Advisory
• https://github.com/openbao/openbao/security/advisories/GHSA-r65v-xgwc-g56jExploit, Vendor Advisory

Published

Apr 21, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-39390CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a …4.8
• CVE-2026-39391CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a …4.8
• CVE-2026-39392CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a …4.8
• CVE-2026-39393CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a …8.1
• CVE-2026-39394CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a …9.8
• CVE-2026-39395Cosign provides code signing and transparency for containers…5.3
• CVE-2026-39397@delmaredigital/payload-puck is a PayloadCMS plugin for inte…9.8
• CVE-2026-39398Rejected reason: The affected product and advisory are not p…
• CVE-2026-39399NuGet Gallery is a package repository that powers nuget.org.…9.6
• CVE-2026-3940Insufficient policy enforcement in DevTools in Google Chrome…5.3
• CVE-2026-39400Cronicle is a multi-server task scheduler and runner, with a…6.1
• CVE-2026-39401Cronicle is a multi-server task scheduler and runner, with a…5.4