CVE-2026-1519— Excessive NSEC3 iterations cause high CPU load during insecure delegation validation
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
循环条件输入未经检查
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-1519
| # | POC Description | Source Link | Shenlong Link |
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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
- CVE-2026-3591
A stack use-after-return flaw in SIG(0) handling code may en - CVE-2026-3119
Authenticated query containing a TKEY record may cause named - CVE-2026-3104
Memory leak in code preparing DNSSEC proofs of non-existence - CVE-2025-13878
Malformed BRID/HHIT records can cause named to terminate une - CVE-2025-40780
Cache poisoning due to weak PRNG
Same vendor: ISC
- CVE-2026-3591
A stack use-after-return flaw in SIG(0) handling code may en - CVE-2026-3119
Authenticated query containing a TKEY record may cause named - CVE-2026-3104
Memory leak in code preparing DNSSEC proofs of non-existence - CVE-2026-3608
Stack overflow in Kea daemons - CVE-2025-13878
Malformed BRID/HHIT records can cause named to terminate une
Same weakness: CWE-606
- CVE-2019-25624
Liquid Studio 2.17 Denial of Service via Malformed Input - CVE-2026-27689
Denial of service (DOS) in SAP Supply Chain Management - CVE-2026-23689
Denial of service (DOS) in SAP Supply Chain Management - CVE-2025-43801
Liferay Portal和Liferay DXP 安全漏洞 - CVE-2025-42930
Denial of Service (DoS) vulnerability in SAP Business Planni
V. Comments for CVE-2026-1519
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