Description
A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.
Details
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| bind9 | — | 1:9.20.11-1ubuntu2.2 |
| bind9-libs | — | — |
| isc-dhcp | — | — |
References
Similar Threats
- Unknown CLSA-2026-1780406874
- Unknown CLSA-2026-1780054328
- Unknown CLSA-2026-1780054583
- Unknown CLSA-2026-1780068979
- Unknown CLSA-2025-1762537520
Exploit Protection
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