CVE-2026-39396: OpenBao is an open source identity-based secrets management system

Q: How do I fix CVE-2026-39396?

openbao: upgrade to 2.5.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-39396 being exploited?

CVE-2026-39396 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39396 affect?

CVE-2026-39396 affects openbao. Severity is low (CVSS 3.1). 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

Q: How urgent is CVE-2026-39396?

Priority 19/100. Public exploit reference

Routine

LOW 3.1UPGRADE

CVE-2026-39396 is a low-severity flaw (CVSS 3.1) affecting openbao. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 decompress

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-400, CWE-674, CWE-770
Published	2026-04-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: openbao

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 01:16 UTCPublished CVE record published
2026-06-17 10:42 UTCUpdated Record last modified

openbao openbao UPGRADE

Affected: < 2.5.3

Fixed in: 2.5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openbao || rpm -q openbao || openbao --version

2. UPGRADE to 2.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openbao

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openbao

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39396?

openbao: upgrade to 2.5.3. Exact commands for each OS are on this page.

Is CVE-2026-39396 being exploited?

CVE-2026-39396 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39396 affect?

CVE-2026-39396 affects openbao. Severity is low (CVSS 3.1). 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

How urgent is CVE-2026-39396?

Priority 19/100. Public exploit reference

Related CVEs

CVE-2026-42186 HIGH 7.5 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-40264 LOW 2.7 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-39946 MEDIUM 4.9 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-39388 LOW 3.1 UPGRADE OpenBao is an open source identity-based secrets management system

References

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