VDB
CVE-2026-11331
CVE-2026-11331
PUBLISHED
CVSS 7.5 HIGH
Reported by isc · Published July 22, 2026
An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| ISC | BIND 9 | 9.16.0, 9.20.0, 9.21.0 |
| ISC | BIND 9 | 9.20.9-S1, 9.16.0, 9.20.0 |
| isc | bind | 9.16.0, 9.20.0, 9.21.0 |
| alpine | bind | 0, 0, 0 |
Timeline
- Jul 22, 2026 Coalition ESS Score
- Jul 22, 2026 CVE Published
- Jul 22, 2026 CVE Updated
- Jul 23, 2026 Security Advisory
- Jul 25, 2026 EPSS Score
References
- CVE-2026-11331 vendor-advisory
- patch
- patch