CVE-2026-10723
published 2026-07-22CVE-2026-10723: BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses. This issue affects BIND 9…
PriorityP338medium6.8CVSS 3.1
AVNACHPRNUINSCCNIHAN
EPSS
0.27%
19.3th percentile
BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses.
This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| isc | bind | — | — |
| isc | bind_9 | 9.11.3-S1 – 9.18.50-S1 | — |
| isc | bind_9 | 9.18.0 – 9.18.50 | — |
| isc | bind_9 | 9.20.0 – 9.20.24 | — |
| isc | bind_9 | 9.20.9-S1 – 9.20.24-S1 | — |
| isc | bind_9 | 9.21.0 – 9.21.23 | — |
| isc | dhcp | — | — |
| ubuntu | bind9 | — | — |
CVSS provenance
nvdv3.16.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
vendor_redhat6.8MEDIUM
vendor_ubuntu6.8MEDIUM
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Ubuntu
Bind vulnerabilities
vendor_ubuntu·2026-08-19·CVSS 6.8
CVE-2026-11721 [MEDIUM] Bind vulnerabilities
Title: Bind vulnerabilities
Summary: Several security issues were fixed in Bind.
It was discovered that Bind incorrectly accepted NSEC3 records whose signer
name did not match the owning zone. A remote attacker could possibly use
this issue to perform NSEC3 impersonation attacks, bypassing DNSSEC
validation. (CVE-2026-10723)
It was discovered that Bind incorrectly handled Key Records using the
PRIVATEDNS algorithm. A remote attacker could possibly use this issue to
cause Bind to crash, resulting in a denial of service. (CVE-2026-10822)
It was discovered that Bind incorrectly handled wildcard CNAME expansion in
Response Policy Zones. A remote attacker could possibly use this issue to
bypass configured RPZ policies. (CVE-2026-11331)
It was discovered that Bind performed unnecessary vali
Red Hat
bind: bind9: Incorrect acceptance of NSEC3 records
vendor_redhat·2026-07-22·CVSS 6.8
CVE-2026-10723 [MEDIUM] CWE-345 bind: bind9: Incorrect acceptance of NSEC3 records
bind: bind9: Incorrect acceptance of NSEC3 records
BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses.
This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses.
Statement: This Moderate flaw in BIND allows an attacker to forge authenticated NXDOMAIN responses for sibling zones due to incorrect validation of child-zone NSEC3 records. Exploitation requires high attack complexity, limiting the immediate risk to Red Hat products.
Mitigation: Upgrade to the patched re
VulDB
ISC BIND up to 9.21.23 Child Zone improper authentication (WID-SEC-2026-2484)
vuldb·2026-08-15·CVSS 6.8
CVE-2026-10723 [MEDIUM] ISC BIND up to 9.21.23 Child Zone improper authentication (WID-SEC-2026-2484)
A vulnerability was found in ISC BIND up to 9.18.50/9.18.50-S1/9.20.24/9.20.24-S1/9.21.23. It has been classified as very critical. Affected is an unknown function of the component Child Zone. Performing a manipulation results in improper authentication.
This vulnerability is cataloged as CVE-2026-10723. It is possible to initiate the attack remotely. There is no exploit available.
Upgrading the affected component is recommended.
GHSA
BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses.
ghsa_unreviewed·2026-07-22
CVE-2026-10723 [MEDIUM] CWE-347 BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses.
BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses.
This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
No detection rules found.
No public exploits indexed.
2026-07-22
Published