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CVE-2026-1519— Excessive NSEC3 iterations cause high CPU load during insecure delegation validation

Quick assessment

Affected
ISC BIND 9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ISC BIND 9是ISC组织的一个域名系统软件。 ISC BIND 9 9.16.50及之前版本、9.18.46及之前版本、9.20.20及之前版本、9.21.19及之前版本、9.16.50-S1及之前版本、9.18.46-S1及之前版本和9.20.20-S1及之前版本存在安全漏洞，该漏洞源于处理恶意区域时消耗过多CPU，可能导致拒绝服务。

CVSS 7.5 · High EPSS 1.60% · P75

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 7

VendorProduct Version RangeStatus
ISC BIND 9 9.11.0≤ 9.16.50 affected
9.18.0≤ 9.18.46 affected
9.20.0≤ 9.20.20 affected
9.21.0≤ 9.21.19 affected
9.11.3-S1≤ 9.16.50-S1 affected
9.18.11-S1≤ 9.18.46-S1 affected
9.20.9-S1≤ 9.20.20-S1 affected
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I. Basic Information for CVE-2026-1519

Vulnerability Information
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Vulnerability Title
Excessive NSEC3 iterations cause high CPU load during insecure delegation validation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
循环条件输入未经检查
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 9 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND 9是ISC组织的一个域名系统软件。 ISC BIND 9 9.16.50及之前版本、9.18.46及之前版本、9.20.20及之前版本、9.21.19及之前版本、9.16.50-S1及之前版本、9.18.46-S1及之前版本和9.20.20-S1及之前版本存在安全漏洞，该漏洞源于处理恶意区域时消耗过多CPU，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC BIND 9 9.11.0 ~ 9.16.50 -

II. Public POCs for CVE-2026-1519

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III. Intelligence Information for CVE-2026-1519

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Patches & Fixes for CVE-2026-1519 (1)

Vendor Advisories for CVE-2026-1519 (2)

Vendor Pages for CVE-2026-1519 (1)

Same Patch Batch · ISC · 2026-03-25 · 5 CVEs total

CVE-2026-3608 7.5 HIGH Stack overflow in Kea daemons
CVE-2026-3104 7.5 HIGH Memory leak in code preparing DNSSEC proofs of non-existence
CVE-2026-3119 6.5 MEDIUM Authenticated query containing a TKEY record may cause named to terminate unexpectedly
CVE-2026-3591 5.4 MEDIUM A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC
Same weakness: CWE-606

V. Comments for CVE-2026-1519

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