🛡️ CVE-2026-16439 — openj9

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: None.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-16439 is classified as CWE-124: Buffer Underwrite ('Buffer Underflow'). The product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer.

Affected software

CVE-2026-16439 is recorded against 1 package.

• openj9 (from 0.8.0 up to 0.60.0)

Timeline and source

Published on 21 July 2026 and last revised on 11 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
gitlab.eclipse.org

Other advisories for this package

openj9 has other advisories on record. If you are patching this one, these are worth checking on the same host:

• CVE-2026-16441 (9.6 Critical, published 21 Jul 2026)
• CVE-2026-6918 (7.5 High, published 5 May 2026)
• CVE-2025-4447 (7.8 High, published 9 May 2025)
• CVE-2024-10917 (3.7 Low, published 11 Nov 2024)
• CVE-2024-3933 (5.3 Medium, published 27 May 2024)
• CVE-2023-5676 (4.1 Medium, published 15 Nov 2023)
• CVE-2023-2597 (7.0 High, published 22 May 2023)
• CVE-2022-3676 (6.5 Medium, published 24 Oct 2022)

Same weakness in other software

These advisories are the same class of weakness (CWE-124: Buffer Underwrite ('Buffer Underflow')) in other software:

• CVE-2026-71969 (6.7 Medium, published 10 Aug 2026)
• CVE-2026-26199 (6.5 Medium, published 20 Jul 2026)
• CVE-2026-44631 (9.8 Critical, published 8 Jun 2026)
• CVE-2024-36343 (published 19 May 2026)
• CVE-2026-34253 (8.2 High, published 15 May 2026)
• CVE-2026-5089 (7.3 High, published 12 May 2026)
• CVE-2026-26204 (4.4 Medium, published 29 Apr 2026)
• CVE-2026-41499 (6.5 Medium, published 29 Apr 2026)

Details

Affected Packages

References