# CVE-2026-3104

## Summary

- **CVE ID:** CVE-2026-3104
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-772
- **Published:** Mar 25, 2026
- **Last Modified:** Sep 1, 2026

## Description

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.

## Affected Products

- ISC — BIND 9 (9.20.0)
- ISC — BIND 9 (9.21.0)
- ISC — BIND 9 (9.20.9-S1)
- ISC — BIND 9 (9.18.0)
- ISC — BIND 9 (9.18.11-S1)

## References

- [CNA](https://kb.isc.org/docs/cve-2026-3104)
- [CNA](https://downloads.isc.org/isc/bind9/9.20.21)
- [CNA](https://downloads.isc.org/isc/bind9/9.21.20)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-3104)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2451310)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3104.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:6935)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.70%
- **EPSS Percentile:** 51.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._