Resource exhaustion in Isc Bind
CVE-2026-3039
BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets. Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments. This issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
EPSS: 0.010 (61.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Isc Bind
- Isc Bind 9 — versions 9.0.0, 9.18.0, 9.20.0
Weakness classification (CWE)
References
- security-officer@isc.org (Patch, patch)
- security-officer@isc.org (Patch, patch)
- security-officer@isc.org (Patch, patch)
- security-officer@isc.org (vendor-advisory, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-3039?
- CVE-2026-3039 is a high-severity vulnerability in Isc Bind, classified under CWE-771. CVSS score: 7.5/10. Published 2026-05-20.
- How severe is CVE-2026-3039?
- High severity. CVSS v3 base score is 7.5 out of 10.