5.4 MediumCWE-562
CVE-2026-3591
A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass
ISCBIND 9
Status
- Not in CISA KEV
- Vendor fix available
Exploit probabilityEPSSchecked 25 Oct
0.3%probability of exploitation in the next 30 days
Higher than 26% of scored CVEs
SeverityCVSS
5.4Medium
Description NVD
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.
Coverage 1 article · 1 outlet
- BIND Updates Patch High-Severity VulnerabilitiesSecurityWeek · first in our coverage · mentions it in passing