Is CVE-2026-123587 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-123587 being exploited in the wild.

How severe is CVE-2026-123587?

Medium severity, with a CVSS score of 6.8, published 8 November 2026.

Which products and versions are affected?

Hickory-Dns Hickory-Net 0.26.0 through 0.26.1.

Is there a fix for CVE-2026-123587?

Yes: fixed in 0.26.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-123587 attacked?

It is attacked over the network.

Am I affected by CVE-2026-123587?

Check whether you run Hickory-Dns Hickory-Net at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-123587: Hickory DNS DNSSEC nonexistence forgery via wraparound NSEC

CVE-2026-123587 · Severity: medium · CVSS 6.8 · Published 2026-11-08

Hickory DNS is a DNS resolver library used to look up domain names and verify DNSSEC signatures to ensure DNS responses are authentic. A flaw in its DNSSEC validation allows attackers who can intercept or spoof DNS responses to forge evidence that a domain record does not exist, potentially redirecting users to attacker-controlled servers or causing other DNS-based attacks.

Technologies: Hickory-Dns Hickory-Net. Vendors: Hickory-Dns.

Quick answers

Is CVE-2026-123587 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-123587 being exploited in the wild.
How severe is CVE-2026-123587?: Medium severity, with a CVSS score of 6.8, published 8 November 2026.
Which products and versions are affected?: Hickory-Dns Hickory-Net 0.26.0 through 0.26.1.
Is there a fix for CVE-2026-123587?: Yes: fixed in 0.26.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-123587 attacked?: It is attacked over the network.
Am I affected by CVE-2026-123587?: Check whether you run Hickory-Dns Hickory-Net at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 0.26.2

Technical details

The vulnerability is a logic error in DNSSEC NSEC record validation (CWE-290: Authentication Bypass by Spoofing). The resolver incorrectly identifies wraparound NSEC records by comparing the next domain name to an SOA record in the response, accepting the SOA even if it fails DNSSEC validation. An attacker on the network path can craft a DNS response containing a genuine NSEC record, its valid RRSIG, and a spoofed SOA record to forge nonexistence of any RRset. The fix properly identifies wraparound NSEC records by comparing the owner name to the next domain name.

Affected products

Hickory DNS hickory-net 0.26.0 through 0.26.1

Timeline

2026-09-03: disclosed
2026-11-08: advisory

References

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