# CVE-2026-3039

## Summary

- **CVE ID:** CVE-2026-3039
- **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-771
- **Published:** May 20, 2026
- **Last Modified:** Sep 10, 2026

## Description

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.

## Affected Products

- ISC — BIND 9 (9.0.0)
- ISC — BIND 9 (9.18.0)
- ISC — BIND 9 (9.20.0)
- ISC — BIND 9 (9.21.0)
- ISC — BIND 9 (9.9.3-S1)
- ISC — BIND 9 (9.18.11-S1)
- ISC — BIND 9 (9.20.9-S1)

## References

- [CNA](https://kb.isc.org/docs/cve-2026-3039)
- [CNA](https://downloads.isc.org/isc/bind9/9.18.49)
- [CNA](https://downloads.isc.org/isc/bind9/9.20.23)
- [CNA](https://downloads.isc.org/isc/bind9/9.21.22)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-3039)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2479767)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3039.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:24338)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:24339)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:23360)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:24367)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:24368)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:20334)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:55441)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:57189)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:60383)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:62549)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.05%
- **EPSS Percentile:** 62.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._