← Vulnerability feed

Vulnerability record · CVE-2026-3039 · published 20 May 2026

CVE-2026-3039: Isc bind allocation without limits vulnerability

Isc · Bind

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.

7.5 CVSS 3.1 High EPSS 2.3% · top 17.5% CWE-771 · CWE-771CWE-770 · Allocation without limits
7.5CVSS 3.1 base score
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
18References
17 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://downloads.isc.org/isc/bind9/9.18.49 Patch
https://downloads.isc.org/isc/bind9/9.20.23 Patch
https://downloads.isc.org/isc/bind9/9.21.22 Patch
https://kb.isc.org/docs/cve-2026-3039 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:20334
https://access.redhat.com/errata/RHSA-2026:23360
https://access.redhat.com/errata/RHSA-2026:24338
https://access.redhat.com/errata/RHSA-2026:24339
https://access.redhat.com/errata/RHSA-2026:24367
https://access.redhat.com/errata/RHSA-2026:24368
https://access.redhat.com/errata/RHSA-2026:55441
https://access.redhat.com/errata/RHSA-2026:57189
https://access.redhat.com/errata/RHSA-2026:60383
https://access.redhat.com/errata/RHSA-2026:62549
https://access.redhat.com/errata/RHSA-2026:65851
https://access.redhat.com/security/cve/CVE-2026-3039
https://bugzilla.redhat.com/show_bug.cgi?id=2479767
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3039.json

Track CVE-2026-3039 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2008-0122Isc bind vulnerabilityOff-by-one error in the inet_network function in libbind in ISC BIND 9.4.2 and earlier, as used in libc in FreeBSD 6.2 through 7.0-PRERELEASE, allows…EPSS 12%10.0CVE-2001-0010Isc bind vulnerabilityBuffer overflow in transaction signature (TSIG) handling code in BIND 8 allows remote attackers to gain root privileges.EPSS 32%10.0CVE-2001-0011Isc bind vulnerabilityBuffer overflow in nslookupComplain function in BIND 4 allows remote attackers to gain root privileges.EPSS 7.7%10.0CVE-2001-0013Isc bind vulnerabilityFormat string vulnerability in nslookupComplain function in BIND 4 allows remote attackers to gain root privileges.EPSS 11%10.0CVE-2000-1029Isc bind vulnerabilityBuffer overflow in host command allows a remote attacker to execute arbitrary commands via a long response to an AXFR query.EPSS 14%10.0CVE-1999-0837Isc bind vulnerabilityDenial of service in BIND by improperly closing TCP sessions via so_linger.EPSS 2.7%10.0CVE-1999-0009Data general dg ux vulnerabilityInverse query buffer overflow in BIND 4.9 and BIND 8 Releases.EPSS 29%9.8CVE-2026-3593Isc bind use after free vulnerabilityA use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 thr…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2026-3039), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.