Vulnerability in Isc Bind
CVE-2026-3104
A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.012 (66.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.012 · change: +0.005
Affected products
- Isc Bind
- Isc Bind 9 — versions 9.20.0, 9.21.0, 9.20.9-S1
Weakness classification (CWE)
References
- kb.isc.org/docs/cve-2026-3104 (vendor-advisory, Vendor Advisory)
- downloads.isc.org/isc/bind9/9.20.21 (Patch, patch)
- downloads.isc.org/isc/bind9/9.21.20 (Patch, patch)
- 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-2026-3104?
- CVE-2026-3104 is a high-severity vulnerability in Isc Bind, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.5/10. Published 2026-03-25.
- How severe is CVE-2026-3104?
- High severity. CVSS v3 base score is 7.5 out of 10.