CVE record · CVE-2026-1519

Excessive NSEC3 iterations cause high CPU load during insecure delegation validation

CVSS 7.5 HighEPSS 0.017 · 77th percentile

Published by the CVE Program (CNA: isc) at 25 Mar 2026, 13:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
ISC	BIND 9	affected 9.11.0 to 9.16.50, inclusive custom affected 9.18.0 to 9.18.46, inclusive custom affected 9.20.0 to 9.20.20, inclusive custom affected 9.21.0 to 9.21.19, inclusive custom affected 9.11.3-S1 to 9.16.50-S1, inclusive custom affected 9.18.11-S1 to 9.18.46-S1, inclusive custom affected 9.20.9-S1 to 9.20.20-S1, inclusive custom Other versions: unaffected

Identifiers: CVE-2026-1519
CNA: isc
Weakness (CWE): CWE-606 · CWE-770
Tags: ISC BIND 9
Denial of service
CWE-606
Published: 25 Mar 2026
Updated: 17 Sept 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (isc)Used for this record
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	ADP (redhat-SADP)

CISA KEV Not listed.
EPSS 0.017, the 77th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 25 Mar 2026. New records show when each source confirmed them.

Sources

References from the CNA

kb.isc.org/docs/cve-2026-1519 vendor-advisory
downloads.isc.org/isc/bind9/9.18.47 patch
downloads.isc.org/isc/bind9/9.20.21 patch
downloads.isc.org/isc/bind9/9.21.20 patch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.