Skip to content
Fencer Vulns
high 7.5

CVE-2026-1519 json

Excessive NSEC3 iterations cause high CPU load during insecure delegation validation

published 2026-03-25 7 mo ago modified 2026-09-17 53 d ago also EUVD-2026-15406

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries). This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 32:9.18.33-10.el10_1.3
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 32:9.18.33-4.el10_0.3
  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION 32:9.8.2-0.68.rc1.el6_10.18
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 32:9.11.4-26.P2.el7_9.20
  • Red Hat Red Hat Enterprise Linux 8 32:9.11.36-16.el8_10.7, 32:9.16.23-0.22.el8_10.5
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 32:9.11.26-4.el8_4.9
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 32:9.11.26-4.el8_4.9
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 32:9.11.36-3.el8_6.12, 32:9.16.23-0.7.el8_6.10
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 32:9.16.23-0.7.el8_6.10
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 32:9.11.36-3.el8_6.12
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 32:9.11.36-3.el8_6.12
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 32:9.11.36-8.el8_8.9, 32:9.16.23-0.14.el8_8.8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 32:9.11.36-8.el8_8.9, 32:9.16.23-0.14.el8_8.8
  • Red Hat Red Hat Enterprise Linux 9 32:9.16.23-34.el9_7.2, 32:9.18.29-5.el9_7.4
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 32:9.16.23-11.el9_2.10
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 32:9.16.23-18.el9_4.11
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 32:9.16.23-31.el9_6.3, 32:9.18.29-4.el9_6.3
  • Red Hat Red Hat OpenShift Container Platform 4.12 412.86.202606251120-0
  • Red Hat Red Hat OpenShift Container Platform 4.13 413.92.202607141229-0
  • Red Hat Red Hat OpenShift Container Platform 4.14 414.92.202607031936-0
  • Red Hat Red Hat OpenShift Container Platform 4.15 415.92.202607210244-0
  • Red Hat Red Hat OpenShift Container Platform 4.16 416.94.202609011112-0
  • Red Hat Red Hat OpenShift Container Platform 4.17 417.94.202608250221-0
  • Red Hat Red Hat OpenShift Container Platform 4.19 4.19.9.6.202606241344-0
  • Red Hat Red Hat Hardened Images 9.18.48-1.hum1
  • bind9 Debian 12 1:9.18.47-1~deb12u1
  • bind9 Debian 13 1:9.20.21-1~deb13u1
  • bind9 Debian 14 1:9.20.21-1

debian advisories DEBIAN-CVE-2026-1519

  • bind9 Ubuntu 22.04 LTS 1:9.18.39-0ubuntu0.22.04.3
  • bind9 Ubuntu 24.04 LTS 1:9.18.39-0ubuntu0.24.04.3
  • bind9 Ubuntu 25.10 1:9.20.11-1ubuntu2.2
  • bind9 Ubuntu Pro 14.04 LTS 1:9.9.5.dfsg-3ubuntu0.19+esm15
  • bind9 Ubuntu Pro 16.04 LTS 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11
  • bind9 Ubuntu Pro 18.04 LTS 1:9.11.3+dfsg-1ubuntu1.19+esm6
  • bind9 Ubuntu Pro 20.04 LTS 1:9.18.30-0ubuntu0.20.04.2+esm3

ubuntu advisories UBUNTU-CVE-2026-1519

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bind hummingbird 1 9.18.48-1.hum1
  • bind-libs hummingbird 1 9.18.48-1.hum1
  • bind-utils hummingbird 1 9.18.48-1.hum1
  • bind-chroot hummingbird 1 9.18.48-1.hum1
  • bind-dnssec-utils hummingbird 1 9.18.48-1.hum1
  • bind RHEL 8 32:9.11.36-16.el8_10.7
  • bind-sdb RHEL 8 32:9.11.36-16.el8_10.7
  • bind-libs RHEL 8 32:9.11.36-16.el8_10.7

red hat advisories RHSA-2026:29110RHSA-2026:25214RHSA-2026:25171RHSA-2026:25083RHSA-2026:24934RHSA-2026:24851

  • bind SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 9.16.50-150400.5.59.1
  • bind SLES for SAP applications 16.0, SLES 16.0 9.20.21-160000.1.1
  • bind SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 9.16.6-150300.22.56.1
  • bind SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 9.20.21-150700.3.18.1
  • bind SLES for SAP 15 SP6, SLES 15 SP6-LTSS, openSUSE Leap 15.6 9.18.33-150600.3.21.1
  • bind SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 9.16.50-150500.8.35.1
  • bind Multi Linux Manager Tools SLE-Micro-5, Manager Client Tools for SLE Micro 5 9.16.6-150000.12.88.1
  • bind SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 9.11.22-3.68.1

suse advisories SUSE-SU-2026:1428-1SUSE-SU-2026:21204-1SUSE-SU-2026:1366-1SUSE-SU-2026:1351-1SUSE-SU-2026:1312-1SUSE-SU-2026:1230-1

  • bind openSUSE Leap 16.0 9.20.21-160000.1.1
  • bind openSUSE Tumbleweed 9.20.21-1.1

opensuse advisories openSUSE-SU-2026:20550-1openSUSE-SU-2026:10448-1

  • bind-license AlmaLinux 10 32:9.18.33-10.el10_1.3
  • bind AlmaLinux 8 32:9.11.36-16.el8_10.7
  • bind-sdb AlmaLinux 8 32:9.11.36-16.el8_10.7
  • bind-libs AlmaLinux 8 32:9.11.36-16.el8_10.7
  • bind-utils AlmaLinux 8 32:9.11.36-16.el8_10.7
  • bind-chroot AlmaLinux 8 32:9.11.36-16.el8_10.7
  • bind-pkcs11 AlmaLinux 8 32:9.11.36-16.el8_10.7
  • bind-license AlmaLinux 8 32:9.11.36-16.el8_10.7

almalinux advisories ALSA-2026:8312ALSA-2026:8352ALSA-2026:8075ALSA-2026:8155ALSA-2026:7915

  • bind Rocky Linux 8 2:9.11.36-16.el8_10.7
  • bind Rocky Linux 10 2:9.18.33-10.el10_1.3
  • bind9.18 Rocky Linux 9 2:9.18.29-5.el9_7.4
  • bind Rocky Linux 9 2:9.16.23-34.el9_7.2
  • bind9.16 Rocky Linux 8 2:9.16.23-0.22.el8_10.5

rocky linux advisories RLSA-2026:8352RLSA-2026:8312RLSA-2026:7915RLSA-2026:8075RLSA-2026:8155

  • bind Alpine 3.21, Alpine 3.20 9.18.47-r0
  • bind Alpine 3.24, Alpine 3.23, Alpine 3.22 9.20.21-r0

alpine advisories ALPINE-CVE-2026-1519

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bind Azure Linux 3.0 9.20.21-1

azure linux advisories AZL-80978

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-1519 updated cvss 7.5

bind: BIND: Denial of Service via maliciously crafted DNSSEC-validated zone

  • Red Hat CodeReady Linux Builder EUS (v.9.6) bind-libs 9.16.23-31.el9_6.3, bind9.18-libs 9.18.29-4.el9_6.3
    fixed: vendor fix RHSA-2026:24500
  • Red Hat Enterprise Linux AppStream (v. 8) bind 9.11.36-16.el8_10.7, bind-sdb 9.11.36-16.el8_10.7, bind-libs 9.11.36-16.el8_10.7, bind-utils 9.11.36-16.el8_10.7, bind9.16 9.16.23-0.22.el8_10.5, bind-chroot 9.11.36-16.el8_10.7, +13 more
    fixed: vendor fix RHSA-2026:8352
  • Red Hat Enterprise Linux AppStream (v. 9) bind 9.16.23-34.el9_7.2, bind9.18 9.18.29-5.el9_7.4, bind-libs 9.16.23-34.el9_7.2, bind-utils 9.16.23-34.el9_7.2, bind-chroot 9.16.23-34.el9_7.2, bind-license 9.16.23-34.el9_7.2, +6 more
    fixed: vendor fix RHSA-2026:8075
  • Red Hat Enterprise Linux AppStream (v. 10) bind 9.18.33-10.el10_1.3, bind-libs 9.18.33-10.el10_1.3, bind-utils 9.18.33-10.el10_1.3, bind-chroot 9.18.33-10.el10_1.3, bind-license 9.18.33-10.el10_1.3, bind-dnssec-utils 9.18.33-10.el10_1.3
    fixed: vendor fix RHSA-2026:8312
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) bind 9.11.26-4.el8_4.9, bind-sdb 9.11.26-4.el8_4.9, bind-libs 9.11.26-4.el8_4.9, bind-pkcs11 9.11.26-4.el8_4.9, bind-libs-lite 9.11.26-4.el8_4.9, bind-sdb-chroot 9.11.26-4.el8_4.9, +1 more
    fixed: vendor fix RHSA-2026:16064
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) bind 9.11.36-3.el8_6.12, bind-sdb 9.11.36-3.el8_6.12, bind-libs 9.11.36-3.el8_6.12, bind-utils 9.11.36-3.el8_6.12, bind9.16 9.16.23-0.7.el8_6.10, bind-chroot 9.11.36-3.el8_6.12, +8 more Red Hat Enterprise Linux AppStream E4S (v.8.6) bind 9.11.36-3.el8_6.12, bind-sdb 9.11.36-3.el8_6.12, bind-libs 9.11.36-3.el8_6.12, bind-utils 9.11.36-3.el8_6.12, bind-chroot 9.11.36-3.el8_6.12, bind-pkcs11 9.11.36-3.el8_6.12, +6 more
    fixed: vendor fix RHSA-2026:16060
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) bind 9.11.36-8.el8_8.9, bind-sdb 9.11.36-8.el8_8.9, bind-libs 9.11.36-8.el8_8.9, bind-utils 9.11.36-8.el8_8.9, bind-chroot 9.11.36-8.el8_8.9, bind-pkcs11 9.11.36-8.el8_8.9, +8 more
    fixed: vendor fix RHSA-2026:15890
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) bind 9.16.23-11.el9_2.10, bind-libs 9.16.23-11.el9_2.10
    fixed: vendor fix RHSA-2026:29110
show 30 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) bind 9.16.23-18.el9_4.11, bind-libs 9.16.23-18.el9_4.11
    fixed: vendor fix RHSA-2026:25214
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) bind 9.18.33-4.el10_0.3, bind-libs 9.18.33-4.el10_0.3
    fixed: vendor fix RHSA-2026:24851
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) bind 9.16.23-31.el9_6.3, bind9.18 9.18.29-4.el9_6.3, bind-libs 9.16.23-31.el9_6.3, bind9.18-libs 9.18.29-4.el9_6.3
    fixed: vendor fix RHSA-2026:24500
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) bind 9.11.26-4.el8_4.9, bind-sdb 9.11.26-4.el8_4.9, bind-libs 9.11.26-4.el8_4.9, bind-pkcs11 9.11.26-4.el8_4.9, bind-libs-lite 9.11.26-4.el8_4.9, bind-sdb-chroot 9.11.26-4.el8_4.9, +1 more
    fixed: vendor fix RHSA-2026:16064
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) bind9.16 9.16.23-0.7.el8_6.10, bind9.16-libs 9.16.23-0.7.el8_6.10
    fixed: vendor fix RHSA-2026:25171
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) bind 9.11.36-3.el8_6.12, bind-sdb 9.11.36-3.el8_6.12, bind-libs 9.11.36-3.el8_6.12, bind-utils 9.11.36-3.el8_6.12, bind-chroot 9.11.36-3.el8_6.12, bind-pkcs11 9.11.36-3.el8_6.12, +6 more
    fixed: vendor fix RHSA-2026:16060
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) bind 9.11.36-8.el8_8.9, bind-sdb 9.11.36-8.el8_8.9, bind-libs 9.11.36-8.el8_8.9, bind-utils 9.11.36-8.el8_8.9, bind-chroot 9.11.36-8.el8_8.9, bind-pkcs11 9.11.36-8.el8_8.9, +8 more
    fixed: vendor fix RHSA-2026:15890
  • Red Hat Enterprise Linux BaseOS (v. 8) bind 9.11.36-16.el8_10.7, bind-export-libs 9.11.36-16.el8_10.7
    fixed: vendor fix RHSA-2026:8352
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bind 9.11.26-4.el8_4.9, bind-export-libs 9.11.26-4.el8_4.9
    fixed: vendor fix RHSA-2026:16064
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bind 9.11.36-3.el8_6.12, bind-export-libs 9.11.36-3.el8_6.12 Red Hat Enterprise Linux BaseOS E4S (v.8.6) bind 9.11.36-3.el8_6.12, bind-export-libs 9.11.36-3.el8_6.12
    fixed: vendor fix RHSA-2026:16060
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bind 9.11.36-8.el8_8.9, bind-export-libs 9.11.36-8.el8_8.9
    fixed: vendor fix RHSA-2026:15890
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bind 9.11.26-4.el8_4.9, bind-export-libs 9.11.26-4.el8_4.9
    fixed: vendor fix RHSA-2026:16064
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bind 9.11.36-3.el8_6.12, bind-export-libs 9.11.36-3.el8_6.12
    fixed: vendor fix RHSA-2026:16060
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bind 9.11.36-8.el8_8.9, bind-export-libs 9.11.36-8.el8_8.9
    fixed: vendor fix RHSA-2026:15890
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) bind-libs 9.16.23-34.el9_7.2, bind9.18-libs 9.18.29-5.el9_7.4
    fixed: vendor fix RHSA-2026:8075
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) bind-doc 9.18.33-10.el10_1.3, bind-devel 9.18.33-10.el10_1.3, bind-debuginfo 9.18.33-10.el10_1.3, bind-debugsource 9.18.33-10.el10_1.3, bind-libs-debuginfo 9.18.33-10.el10_1.3, bind-utils-debuginfo 9.18.33-10.el10_1.3, +1 more
    fixed: vendor fix RHSA-2026:8312
  • Red Hat Enterprise Linux CRB (v. 8) bind9.16-libs 9.16.23-0.22.el8_10.5
    fixed: vendor fix RHSA-2026:8155
  • Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) bind 9.8.2-0.68.rc1.el6_10.18, bind-libs 9.8.2-0.68.rc1.el6_10.18
    fixed: vendor fix RHSA-2026:11372
  • Red Hat Enterprise Linux Server (v. 7 ELS) bind 9.11.4-26.P2.el7_9.20, bind-libs 9.11.4-26.P2.el7_9.20, bind-utils 9.11.4-26.P2.el7_9.20, bind-pkcs11 9.11.4-26.P2.el7_9.20, bind-libs-lite 9.11.4-26.P2.el7_9.20, bind-export-libs 9.11.4-26.P2.el7_9.20, +2 more
    fixed: vendor fix RHSA-2026:11371
  • Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) bind-sdb 9.8.2-0.68.rc1.el6_10.18
    fixed: vendor fix RHSA-2026:11372
  • Red Hat Enterprise Linux Server Optional (v. 7 ELS) bind-sdb 9.11.4-26.P2.el7_9.20
    fixed: vendor fix RHSA-2026:11371
  • Red Hat Hardened Images bind 9.18.48-1.hum1, bind-libs 9.18.48-1.hum1, bind-utils 9.18.48-1.hum1, bind-chroot 9.18.48-1.hum1, bind-dnssec-utils 9.18.48-1.hum1
    fixed: vendor fix RHSA-2026:6935
  • Red Hat OpenShift Container Platform 4.12 rhcos 412.86.202606251120
    fixed: vendor fix RHSA-2026:34048
  • Red Hat OpenShift Container Platform 4.13 rhcos 413.92.202607141229
    fixed: vendor fix RHSA-2026:40021
  • Red Hat OpenShift Container Platform 4.14 rhcos 414.92.202607031936
    fixed: vendor fix RHSA-2026:36610
  • Red Hat OpenShift Container Platform 4.15 rhcos 415.92.202607210244
    fixed: vendor fix RHSA-2026:43226
  • Red Hat OpenShift Container Platform 4.16 rhcos 416.94.202609011112
    fixed: vendor fix RHSA-2026:62549
  • Red Hat OpenShift Container Platform 4.17 rhcos 417.94.202608250221
    fixed: vendor fix RHSA-2026:60019
  • Red Hat OpenShift Container Platform 4.18 rhcos 418.94.202609031320
    fixed: vendor fix RHSA-2026:65851
  • Red Hat OpenShift Container Platform 4.19 rhcos 4.19.9.6.202606241344
    fixed: vendor fix RHSA-2026:29863

20 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

1.69% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • ISC BIND 9
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat OpenShift Container Platform 4.12
  • Red Hat Red Hat OpenShift Container Platform 4.13
  • Red Hat Red Hat OpenShift Container Platform 4.14
  • Red Hat Red Hat OpenShift Container Platform 4.15
  • Red Hat Red Hat OpenShift Container Platform 4.16
  • Red Hat Red Hat OpenShift Container Platform 4.17
  • Red Hat Red Hat OpenShift Container Platform 4.19
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-606 Unchecked Input for Loop Condition
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.