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TI-2026-01209 Aliases CVE-2026-1519GHSA-84m6-p53c-x4wp

Excessive NSEC3 iterations cause high CPU load during insecure delegation validation

Priority MEDIUM 42CWE-606Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01687 77th percentileScored 2026-11-07
Fix Fixed Red Hat: 26 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ISCBIND 99.11.0 – 9.16.50; 9.18.0 – 9.18.46; 9.20.0 – 9.20.20; 9.21.0 – 9.21.19; 9.11.3-S1 – 9.16.50-S1; 9.18.11-S1 – 9.18.46-S1; 9.20.9-S1 – 9.20.20-S1—No fix listedCNA
  • BIND 9 VendorISC Affected 9.11.0 – 9.16.50; 9.18.0 – 9.18.46; 9.20.0 – 9.20.20; 9.21.0 – 9.21.19; 9.11.3-S1 – 9.16.50-S1; 9.18.11-S1 – 9.18.46-S1; 9.20.9-S1 – 9.20.20-S1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*9.11.0 – 9.16.50; 9.18.0 to before 9.18.47; 9.20.0 to before 9.20.21; 9.21.0 to before 9.21.20VulnerableISC
  • cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* Versions 9.11.0 – 9.16.50; 9.18.0 to before 9.18.47; 9.20.0 to before 9.20.21; 9.21.0 to before 9.21.20 Vulnerable ·ISC

Remediation

Red Hat 26 advisories

  • RHSA-2026:65851 Released 2026-09-17 · Red Hat rating Important
    OpenShift Container Platform 4.18.55 bug fix and security update
    • Red Hat OpenShift Container Platform 4.18 rhcos-aarch64-418.94.202609031320-0, rhcos-ppc64le-418.94.202609031320-0, rhcos-s390x-418.94.202609031320-0 +1
  • RHSA-2026:62549 Released 2026-09-10 · Red Hat rating Important
    OpenShift Container Platform 4.16.70 bug fix and security update
    • Red Hat OpenShift Container Platform 4.16 rhcos-aarch64-416.94.202609011112-0, rhcos-ppc64le-416.94.202609011112-0, rhcos-s390x-416.94.202609011112-0 +1
  • RHSA-2026:60019 Released 2026-09-03 · Red Hat rating Important
    OpenShift Container Platform 4.17.57 bug fix and security update
    • Red Hat OpenShift Container Platform 4.17 rhcos-aarch64-417.94.202608250221-0, rhcos-ppc64le-417.94.202608250221-0, rhcos-s390x-417.94.202608250221-0 +1
Show 23 more Red Hat advisories
  • RHSA-2026:43226 Released 2026-07-31 · Red Hat rating Important
    OpenShift Container Platform 4.15.67 bug fix and security update
    • Red Hat OpenShift Container Platform 4.15 rhcos-aarch64-415.92.202607210244-0, rhcos-ppc64le-415.92.202607210244-0, rhcos-s390x-415.92.202607210244-0 +1
  • RHSA-2026:40021 Released 2026-07-23 · Red Hat rating Important
    OpenShift Container Platform 4.13.69 bug fix and security update
    • Red Hat OpenShift Container Platform 4.13 rhcos-x86_64-413.92.202607141229-0
  • RHSA-2026:36610 Released 2026-07-20 · Red Hat rating Important
    OpenShift Container Platform 4.14.69 bug fix and security update
    • Red Hat OpenShift Container Platform 4.14 rhcos-aarch64-414.92.202607031936-0, rhcos-ppc64le-414.92.202607031936-0, rhcos-s390x-414.92.202607031936-0 +1
  • RHSA-2026:34048 Released 2026-07-09 · Red Hat rating Important
    OpenShift Container Platform 4.12.93 bug fix and security update
    • Red Hat OpenShift Container Platform 4.12 rhcos-x86_64-412.86.202606251120-0
  • RHSA-2026:29863 Released 2026-07-02 · Red Hat rating Important
    OpenShift Container Platform 4.19.36 bug fix and security update
    • Red Hat OpenShift Container Platform 4.19 rhcos-aarch64-4.19.9.6.202606241344-0, rhcos-ppc64le-4.19.9.6.202606241344-0, rhcos-s390x-4.19.9.6.202606241344-0 +1
  • RHSA-2026:29110 Released 2026-06-24 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) bind-32:9.16.23-11.el9_2.10, bind-libs-32:9.16.23-11.el9_2.10
  • RHSA-2026:24934 Released 2026-06-11 · Red Hat rating Important
    bind9.18 security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) bind9.18-libs-32:9.18.29-4.el9_6.3
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) bind9.18-32:9.18.29-4.el9_6.3, bind9.18-libs-32:9.18.29-4.el9_6.3
  • RHSA-2026:25214 Released 2026-06-11 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) bind-32:9.16.23-18.el9_4.11, bind-libs-32:9.16.23-18.el9_4.11
  • RHSA-2026:25171 Released 2026-06-11 · Red Hat rating Important
    bind9.16 security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) bind9.16-32:9.16.23-0.7.el8_6.10, bind9.16-libs-32:9.16.23-0.7.el8_6.10
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) bind9.16-32:9.16.23-0.7.el8_6.10, bind9.16-libs-32:9.16.23-0.7.el8_6.10
  • RHSA-2026:25083 Released 2026-06-10 · Red Hat rating Important
    bind9.16 security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) bind9.16-32:9.16.23-0.14.el8_8.8, bind9.16-libs-32:9.16.23-0.14.el8_8.8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) bind9.16-32:9.16.23-0.14.el8_8.8, bind9.16-libs-32:9.16.23-0.14.el8_8.8
  • RHSA-2026:24851 Released 2026-06-09 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) bind-32:9.18.33-4.el10_0.3, bind-libs-32:9.18.33-4.el10_0.3
  • RHSA-2026:24500 Released 2026-06-08 · Red Hat rating Important
    bind security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) bind-libs-32:9.16.23-31.el9_6.3
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) bind-32:9.16.23-31.el9_6.3, bind-libs-32:9.16.23-31.el9_6.3
  • RHSA-2026:16060 Released 2026-05-11 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) bind-32:9.11.36-3.el8_6.12, bind-chroot-32:9.11.36-3.el8_6.12, bind-devel-32:9.11.36-3.el8_6.12 +12
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) bind-32:9.11.36-3.el8_6.12, bind-chroot-32:9.11.36-3.el8_6.12, bind-devel-32:9.11.36-3.el8_6.12 +12
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) bind-32:9.11.36-3.el8_6.12, bind-chroot-32:9.11.36-3.el8_6.12, bind-devel-32:9.11.36-3.el8_6.12 +12
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bind-32:9.11.36-3.el8_6.12, bind-export-devel-32:9.11.36-3.el8_6.12, bind-export-libs-32:9.11.36-3.el8_6.12
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bind-32:9.11.36-3.el8_6.12, bind-export-devel-32:9.11.36-3.el8_6.12, bind-export-libs-32:9.11.36-3.el8_6.12
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bind-32:9.11.36-3.el8_6.12, bind-export-devel-32:9.11.36-3.el8_6.12, bind-export-libs-32:9.11.36-3.el8_6.12
  • RHSA-2026:16064 Released 2026-05-11 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) bind-32:9.11.26-4.el8_4.9, bind-devel-32:9.11.26-4.el8_4.9, bind-libs-32:9.11.26-4.el8_4.9 +7
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) bind-32:9.11.26-4.el8_4.9, bind-devel-32:9.11.26-4.el8_4.9, bind-libs-32:9.11.26-4.el8_4.9 +7
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bind-32:9.11.26-4.el8_4.9, bind-export-devel-32:9.11.26-4.el8_4.9, bind-export-libs-32:9.11.26-4.el8_4.9
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bind-32:9.11.26-4.el8_4.9, bind-export-devel-32:9.11.26-4.el8_4.9, bind-export-libs-32:9.11.26-4.el8_4.9
  • RHSA-2026:15890 Released 2026-05-11 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) bind-32:9.11.36-8.el8_8.9, bind-chroot-32:9.11.36-8.el8_8.9, bind-devel-32:9.11.36-8.el8_8.9 +12
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) bind-32:9.11.36-8.el8_8.9, bind-chroot-32:9.11.36-8.el8_8.9, bind-devel-32:9.11.36-8.el8_8.9 +12
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bind-32:9.11.36-8.el8_8.9, bind-export-devel-32:9.11.36-8.el8_8.9, bind-export-libs-32:9.11.36-8.el8_8.9
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bind-32:9.11.36-8.el8_8.9, bind-export-devel-32:9.11.36-8.el8_8.9, bind-export-libs-32:9.11.36-8.el8_8.9
  • RHSA-2026:11371 Released 2026-04-28 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) bind-32:9.11.4-26.P2.el7_9.20, bind-export-libs-32:9.11.4-26.P2.el7_9.20, bind-export-libs-32:9.11.4-26.P2.el7_9.20.ppc +9
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) bind-devel-32:9.11.4-26.P2.el7_9.20, bind-devel-32:9.11.4-26.P2.el7_9.20.ppc, bind-export-devel-32:9.11.4-26.P2.el7_9.20 +6
  • RHSA-2026:11372 Released 2026-04-28 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) bind-32:9.8.2-0.68.rc1.el6_10.18, bind-libs-32:9.8.2-0.68.rc1.el6_10.18
    • Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) bind-devel-32:9.8.2-0.68.rc1.el6_10.18, bind-sdb-32:9.8.2-0.68.rc1.el6_10.18
  • RHSA-2026:8352 Released 2026-04-15 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux AppStream (v. 8) bind-32:9.11.36-16.el8_10.7, bind-chroot-32:9.11.36-16.el8_10.7, bind-devel-32:9.11.36-16.el8_10.7 +12
    • Red Hat Enterprise Linux BaseOS (v. 8) bind-32:9.11.36-16.el8_10.7, bind-export-devel-32:9.11.36-16.el8_10.7, bind-export-libs-32:9.11.36-16.el8_10.7
  • RHSA-2026:8312 Released 2026-04-15 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux AppStream (v. 10) bind-32:9.18.33-10.el10_1.3, bind-chroot-32:9.18.33-10.el10_1.3, bind-dnssec-utils-32:9.18.33-10.el10_1.3 +3
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) bind-devel-32:9.18.33-10.el10_1.3, bind-doc-32:9.18.33-10.el10_1.3
  • RHSA-2026:8155 Released 2026-04-14 · Red Hat rating Important
    bind9.16 security update
    • Red Hat Enterprise Linux AppStream (v. 8) bind9.16-32:9.16.23-0.22.el8_10.5, bind9.16-chroot-32:9.16.23-0.22.el8_10.5, bind9.16-dnssec-utils-32:9.16.23-0.22.el8_10.5 +4
    • Red Hat Enterprise Linux CRB (v. 8) bind9.16-devel-32:9.16.23-0.22.el8_10.5, bind9.16-doc-32:9.16.23-0.22.el8_10.5, bind9.16-libs-32:9.16.23-0.22.el8_10.5
  • RHSA-2026:8075 Released 2026-04-14 · Red Hat rating Important
    bind security update
    • Red Hat Enterprise Linux AppStream (v. 9) bind-32:9.16.23-34.el9_7.2, bind-chroot-32:9.16.23-34.el9_7.2, bind-dnssec-doc-32:9.16.23-34.el9_7.2 +5
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) bind-devel-32:9.16.23-34.el9_7.2, bind-doc-32:9.16.23-34.el9_7.2, bind-libs-32:9.16.23-34.el9_7.2
  • RHSA-2026:7915 Released 2026-04-13 · Red Hat rating Important
    bind9.18 security update
    • Red Hat Enterprise Linux AppStream (v. 9) bind9.18-32:9.18.29-5.el9_7.4, bind9.18-chroot-32:9.18.29-5.el9_7.4, bind9.18-dnssec-utils-32:9.18.29-5.el9_7.4 +2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) bind9.18-devel-32:9.18.29-5.el9_7.4, bind9.18-doc-32:9.18.29-5.el9_7.4, bind9.18-libs-32:9.18.29-5.el9_7.4
  • RHSA-2026:6935 Released 2026-04-07 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images bind-9.18.48-1.hum1@aarch64, bind-9.18.48-1.hum1@src, bind-9.18.48-1.hum1@x86_64 +12

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:24500, RHSA-2026:24934
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:8312
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:8155, RHSA-2026:8352
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:7915, RHSA-2026:8075
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:16064
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:16060, RHSA-2026:25171
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2026:16060
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:15890, RHSA-2026:25083
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:29110
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:25214
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:24851
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:24500, RHSA-2026:24934
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:16064
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:25171
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2026:16060
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:15890, RHSA-2026:25083
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:8352
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:16064
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:16060
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2026:16060
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:15890
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:16064
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2026:16060
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:15890
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:8155
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:8312
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:7915, RHSA-2026:8075
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:11371
Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION)Fixed RHSA-2026:11372
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:11371
Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION)Fixed RHSA-2026:11372
Red Hat Hardened ImagesFixed RHSA-2026:6935
Red Hat OpenShift Container Platform 4.12Fixed RHSA-2026:34048
Red Hat OpenShift Container Platform 4.13Fixed RHSA-2026:40021
Red Hat OpenShift Container Platform 4.14Fixed RHSA-2026:36610
Red Hat OpenShift Container Platform 4.15Fixed RHSA-2026:43226
Red Hat OpenShift Container Platform 4.16Fixed RHSA-2026:62549
Red Hat OpenShift Container Platform 4.17Fixed RHSA-2026:60019
Red Hat OpenShift Container Platform 4.18Fixed RHSA-2026:65851
Red Hat OpenShift Container Platform 4.19Fixed RHSA-2026:29863
Not affected: 20 products
  • Red Hat CodeReady Linux Builder EUS (v.9.6)
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • Red Hat Enterprise Linux AppStream AUS (v.8.6)
  • Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)
  • Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)
  • Red Hat Enterprise Linux Server (v. 7 ELS)
  • Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION)
  • Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION)
  • Red Hat OpenShift Container Platform 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-1519
  2. 2026-10-03 Alias added: GHSA-84m6-p53c-x4wp
  3. 2026-10-09 Affected versions changed · Red Hat

References

Patch 3

Advisory 2

  • TI-2015-04610 Assertion failure in ISC BIND named via TKEY queries KEVCVSS 3.1HIGH 7.5
  • TI-2023-27571 Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related… CVSS 3.1HIGH 7.5
  • TI-2021-07476 A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack CVSS 3.1CRITICAL 9.8
  • TI-2023-27773 The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance… CVSS 3.1HIGH 7.5
  • TI-2020-06910 A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c CVSS 3.1HIGH 7.5
  • TI-2016-02320 buffer.c in named in ISC BIND 9 before 9.9.9-P3, 9.10.x before 9.10.4-P3, and 9.11.x… CVSS 3.0HIGH 7.5
See all 192 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences