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Vulnerabilities

Vulnerability · CVE-2026-39396

OpenBao is an open source identity-based secrets management system.

Published Apr 21, 2026 · catalog updated Jun 17, 2026 · OpenBao is an open

Check if you run it

No confirmed exploitation is on record for CVE-2026-39396. EPSS is 0.33%. Act only if a listed version of OpenBao is an open is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OpenBao is an open).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.33%
Remediation
Advisory link
Affected products
cpe openbao/openbao

OpenBao is an open source identity-based secrets management system. Prior to version 2.5.3, in OpenBao's OCI plugin downloader extracts a plugin binary from a container image by streaming decompressed tar data via 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe openbao/openbaoversion unspecified

How to fix CVE-2026-39396

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-39396. EPSS is 0.33%. Act only if a listed version of OpenBao is an open is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-400: Uncontrolled Resource Consumption; CWE-674; CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.33%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 21, 2026 · NIST NVD

    Detected

    OpenBao is an open source identity-based secrets management system. Prior to version 2.5.3, in OpenBao's OCI plugin downloader extracts a plugin binary from a container image by streaming decompressed tar data via 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

  2. Jun 17, 2026 · NIST NVD

    Updated

    OpenBao is an open source identity-based secrets management system. Prior to version 2.5.3, in OpenBao's OCI plugin downloader extracts a plugin binary from a container image by streaming decompressed tar data via 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

Sources

  • CVE.orgVulnerability recordCVE-2026-39396

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-39396

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-39396

    OpenBao is an open source identity-based secrets management system. Prior to version 2.5.3, in OpenBao's OCI plugin downloader extracts a plugin binary from a container image by streaming decompressed tar data via with no upper bound on the nu

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.