CVE-2026-3591
5.4 MEDIUMA use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0)
Published: 2026-03-25 · Last updated: 2026-05-21
Severity and scoring
- CVSS
- 5.4 MEDIUM
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- CWE
- CWE-305, CWE-562
Affected products
| Vendor | Product |
|---|---|
| isc | bind |
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.
Source: NVD
References
Related CVEs
Same vendor
- CVE-2026-5950 — An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthen... (5.3 MEDIUM)
- CVE-2026-5947 — Undefined behavior may result due to a race condition leading to a use-after-free violation (7.5 HIGH)
- CVE-2026-5946 — Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, ... (7.5 HIGH)
- CVE-2026-3593 — A use-after-free vulnerability exists within the DNS-over-HTTPS implementation (7.4 HIGH)
- CVE-2026-3592 — BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack (5.3 MEDIUM)
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