CVE-2026-1519
7.5 HIGHIf a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU
Published: 2026-03-25 · Last updated: 2026-05-21
Severity and scoring
- CVSS
- 7.5 HIGH
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CWE
- CWE-606
Affected products
| Vendor | Product |
|---|---|
| isc | bind |
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
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-1519
- [Patch]https://downloads.isc.org/isc/bind9/9.18.47
- [Patch]https://downloads.isc.org/isc/bind9/9.20.21
- [Patch]https://downloads.isc.org/isc/bind9/9.21.20
- [Vendor advisory]https://kb.isc.org/docs/cve-2026-1519
- [Other]https://lists.debian.org/debian-lts-announce/2026/04/msg00008.html
Related CVEs
Same vendor
- CVE-2026-5950 — An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthen... (5.3 MEDIUM)
- CVE-2026-5947 — Undefined behavior may result due to a race condition leading to a use-after-free violation (7.5 HIGH)
- CVE-2026-5946 — Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, ... (7.5 HIGH)
- CVE-2026-3593 — A use-after-free vulnerability exists within the DNS-over-HTTPS implementation (7.4 HIGH)
- CVE-2026-3592 — BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack (5.3 MEDIUM)
Same CWE
- CVE-2026-41986 — Logic bypass vulnerability in the file system (2.4 LOW)
- CVE-2026-5950 — An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthen... (5.3 MEDIUM)