CVE-2026-10723 PUBLISHED

Incorrect acceptance of NSEC3 records

Assigner: isc
Reserved: 03.06.2026 Published: 22.07.2026 Updated: 22.07.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
CVSS Score: 6.8

Product Status

Vendor ISC
Product BIND 9
Versions Default: unaffected
  • affected from 9.18.0 to 9.18.50 (incl.)
  • affected from 9.20.0 to 9.20.24 (incl.)
  • affected from 9.21.0 to 9.21.23 (incl.)
  • affected from 9.11.3-S1 to 9.18.50-S1 (incl.)
  • affected from 9.20.9-S1 to 9.20.24-S1 (incl.)

Exploits

We are not aware of any active exploits.

Workarounds

No workarounds known.

Solutions

Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26, 9.21.24, or 9.20.26-S1.

Credits

  • ISC would like to thank Qifan Zhang of Palo Alto Networks for bringing this vulnerability to our attention.

References

Problem Types

  • CWE-347 Improper Verification of Cryptographic Signature CWE

Impacts

  • An attacker may be able to forge NXDOMAIN responses for other sibling zones.