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Vulnerabilities

Vulnerability · CVE-2026-1519

If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU.

Published Mar 25, 2026 · catalog updated Oct 17, 2026 · If a BIND resolver

Check if you run it

No confirmed exploitation is on record for CVE-2026-1519. EPSS is 1.60%. Act only if a listed version of If a BIND resolver is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (If a BIND resolver).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.60%
Remediation
Advisory link
Affected products
Ubuntu:18.04:LTS isc-dhcp · Ubuntu:20.04:LTS bind9-libs · Ubuntu:22.04:LTS bind9 · Ubuntu:22.04:LTS bind9-libs · Ubuntu:24.04:LTS bind9 · Ubuntu:24.04:LTS isc-dhcp

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Ubuntu:18.04:LTS isc-dhcp4.3.5-3ubuntu2, 4.3.5-3ubuntu3, 4.3.5-3ubuntu4
  • Ubuntu:20.04:LTS bind9-libs1:9.11.16+dfsg-3~build1, 1:9.11.16+dfsg-3~ubuntu1
  • Ubuntu:22.04:LTS bind90 → 1:9.18.39-0ubuntu0.22.04.3
  • Ubuntu:22.04:LTS bind9-libs1:9.11.19+dfsg-2.1ubuntu1, 1:9.11.19+dfsg-2.1ubuntu2, 1:9.11.19+dfsg-2.1ubuntu3
  • Ubuntu:24.04:LTS bind90 → 1:9.18.39-0ubuntu0.24.04.3
  • Ubuntu:24.04:LTS isc-dhcp4.4.3-P1-2ubuntu5, 4.4.3-P1-4ubuntu1, 4.4.3-P1-4ubuntu2
  • Ubuntu:25.10 bind90 → 1:9.20.11-1ubuntu2.2
  • Ubuntu:25.10 isc-dhcp4.4.3-P1-4ubuntu2
  • Ubuntu:Pro:14.04:LTS bind90 → 1:9.9.5.dfsg-3ubuntu0.19+esm15
  • Ubuntu:Pro:16.04:LTS bind90 → 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11
  • Ubuntu:Pro:18.04:LTS bind90 → 1:9.11.3+dfsg-1ubuntu1.19+esm6
  • Ubuntu:Pro:20.04:LTS bind90 → 1:9.18.30-0ubuntu0.20.04.2+esm3
  • cpe isc/bindversion unspecified

How to fix CVE-2026-1519

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-1519. EPSS is 1.60%. Act only if a listed version of If a BIND resolver is installed.

Which versions are affected?

Compare what you have installed with 4.3.5-3ubuntu2, 4.3.5-3ubuntu3, 4.3.5-3ubuntu4, 1:9.11.16+dfsg-3~build1, 1:9.11.16+dfsg-3~ubuntu1, 0 → 1:9.18.39-0ubuntu0.22.04.3, 1:9.11.19+dfsg-2.1ubuntu1, 1:9.11.19+dfsg-2.1ubuntu2, 1:9.11.19+dfsg-2.1ubuntu3, 0 → 1:9.18.39-0ubuntu0.24.04.3, 4.4.3-P1-2ubuntu5, 4.4.3-P1-4ubuntu1, 4.4.3-P1-4ubuntu2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-606; CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 1.60%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 17, 2026 · NIST NVD

    Updated

    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.

  2. Oct 14, 2026 · Ubuntu Security Notices

    Detected

    Zuyao Xu and Xiang Li discovered that Bind incorrectly handled certain malformed DNSKEY records. A remote attacker could possibly use this issue to cause Bind to consume resources, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2025-8677) Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that Bind incorrectly a

  3. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind9 fixed in 1:9.9.5.dfsg-3ubuntu0.19+esm15; bind9 fixed in 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11; bind9 fixed in 1:9.11.3+dfsg-1ubuntu1.19+esm6; bind9 fixed in 1:9.18.30-0ubuntu0.20.04.2+esm3

  4. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind9 fixed in 1:9.9.5.dfsg-3ubuntu0.19+esm15

  5. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind9 fixed in 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11

  6. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind9 fixed in 1:9.11.3+dfsg-1ubuntu1.19+esm6

  7. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind9 fixed in 1:9.18.30-0ubuntu0.20.04.2+esm3

  8. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind9 fixed in 1:9.18.39-0ubuntu0.22.04.3

  9. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind9 fixed in 1:9.18.39-0ubuntu0.24.04.3

  10. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    bind9 fixed in 1:9.20.11-1ubuntu2.2

  11. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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.

  12. Oct 17, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-1519

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-1519

    30-day exploitation probability 1.6%

    first.org
  • NIST NVDVulnerability recordCVE-2026-1519

    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:

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryUBUNTU-CVE-2026-1519
    osv.dev
  • Ubuntu Security NoticesVendor advisoryCVE-2026-1519

    Zuyao Xu and Xiang Li discovered that Bind incorrectly handled certain malformed DNSKEY records. A remote attacker could possibly use this issue to cause Bind to consume resources, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and

    ubuntu.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.