CVE record · CVE-2026-11721

Cache poisoning possible with label count discrepancy, RRSIG, and wildcards

CVSS 7.5 HighEPSS 0.0040 · 33rd percentile

Published by the CVE Program (CNA: isc) at 22 Jul 2026, 14:13 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 9.18.50, inclusive custom affected 9.20.0 to 9.20.24, inclusive custom affected 9.21.0 to 9.21.23, inclusive custom affected 9.11.3-S1 to 9.18.50-S1, inclusive custom affected 9.20.9-S1 to 9.20.24-S1, inclusive custom Other versions: unaffected

Identifiers: CVE-2026-11721
CNA: isc
Weakness (CWE): CWE-1284
Tags: ISC BIND 9
CWE-1284
Published: 22 Jul 2026
Updated: 22 Jul 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:H/A:N	CNA (isc)

CISA KEV Not listed.
EPSS 0.0040, the 33rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

22 Jul 2026, 15:16 UTC Confirmed by NVD

Sources

References from the CNA

kb.isc.org/docs/cve-2026-11721 vendor-advisory
downloads.isc.org/isc/bind9/9.20.26 patch
downloads.isc.org/isc/bind9/9.21.24 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.