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CVE-2026-56444 (Medium) detected in src4.0.4 #474
Description
CVE-2026-56444 - Medium Severity Vulnerability
Vulnerable Library - src4.0.4
MidnightBSD OS source code
Library home page: https://github.com/MidnightBSD/src.git
Found in base branches: stable/4.0, master
Vulnerable Source Files (1)
Vulnerability Details
In NLnet Labs Unbound 1.20.0 up to and including 1.25.1, when Unbound is configured with 'serve-expired: yes' and 'serve-expired-client-timeout > discard-timeout > 0' (contrary to the suggested values), the discard-timeout branch during the serve expired logic drops an aged client reply without performing the correct accounting for the number of reply addresses for the query. Other identical branches outside of serve expired perform the correct decrement. Since the counter is never decremented in such scenario, it can reach the maximum limit and new clients for duplicate in-flight queries are silently dropped resulting in degradation of resolution service. A malicious actor can exploit the vulnerability by querying the resolver for a client-controlled slow-on-demand authoritative zone that can drive the counter past the threshold. Shipped defaults for 'serve-expired-client-timeout: 1800' and 'discard-timeout: 1900' make the branch unreachable.
Publish Date: 2026-07-22
URL: CVE-2026-56444
CVSS 3 Score Details (5.9)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
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Activity
[-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+][-]CVE-2026-56444 (Medium) detected in src4.0.4[/-][+]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/+][-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+][-]CVE-2026-56444 (Medium) detected in src4.0.4[/-][+]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/+][-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+][-]CVE-2026-56444 (Medium) detected in src4.0.4[/-][+]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/+][-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+][-]CVE-2026-56444 (Medium) detected in src4.0.4[/-][+]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/+][-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+][-]CVE-2026-56444 (Medium) detected in src4.0.4[/-][+]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/+][-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+][-]CVE-2026-56444 (Medium) detected in src4.0.4[/-][+]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/+][-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+][-]CVE-2026-56444 (Medium) detected in src4.0.4[/-][+]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/+][-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+][-]CVE-2026-56444 (Medium) detected in src4.0.4[/-][+]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/+][-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+][-]CVE-2026-56444 (Medium) detected in src4.0.4[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4 - autoclosed[/+]mend-bolt-for-github commentedon Sep 18, 2026
✔️ This issue was automatically closed by Mend because the vulnerable library in the specific branch(es) was either marked as ignored or it is no longer part of the Mend inventory.
mend-bolt-for-github commentedon Sep 18, 2026
✔️ This issue was automatically closed by Mend because the vulnerable library in the specific branch(es) was either marked as ignored or it is no longer part of the Mend inventory.
[-]CVE-2026-56444 (Medium) detected in src4.0.4 - autoclosed[/-][+]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/+]mend-bolt-for-github commentedon Oct 7, 2026
ℹ️ This issue was automatically re-opened by Mend because the vulnerable library in the specific branch(es) has been detected in the Mend inventory.
[-]CVE-2026-56444 (Medium) detected in freebsd-srcrelease/15.0.0-p7[/-][+]CVE-2026-56444 (Medium) detected in src4.0.4[/+]