CVE-2026-3039

BIND 9 server memory exhaustion during GSS-API TKEY negotiation

At a glance

Severity: HIGH 7.5
EPSS: EPSS 1.09 % · percentile 65 (2026-10-27)
State: PUBLISHED
Published: 2026-05-20
Updated: 2026-09-17
Assigner: isc
NVD status: Modified

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	isc
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat-SADP
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · security-officer@isc.org (Secondary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary)

Weaknesses (CWE)

European references

ENISA EUVD · EUVD-2026-31103
GCVE · GCVE-0-2026-3039

CERT-FR advisories

CERTFR-2026-AVI-0986 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2026-AVI-0618 — Multiples vulnérabilités dans ISC BIND · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.0.0 ≤ 9.16.50
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.18.0 < 9.18.49
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.20.0 < 9.20.23
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.21.0 < 9.21.22

Affected products

Product	Versions
ISC · BIND 9	affected 9.0.0 ≤ 9.16.50 ; affected 9.18.0 ≤ 9.18.48 ; affected 9.20.0 ≤ 9.20.22 ; affected 9.21.0 ≤ 9.21.21 ; affected 9.9.3-S1 ≤ 9.16.50-S1 ; affected 9.18.11-S1 ≤ 9.18.48-S1

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD