Quick answers
- Is CVE-2026-123574 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123574 being exploited in the wild.
- How severe is CVE-2026-123574?
- High severity, with a CVSS score of 7.5, published 8 November 2026.
- Which products and versions are affected?
- Hickory-Dns Hickory-Proto 0.24.0 to 0.26.1.
- Is there a fix for CVE-2026-123574?
- Yes: fixed in hickory-proto 0.26.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-123574 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-123574?
- Check whether you run Hickory-Dns Hickory-Proto 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: hickory-proto 0.26.2
Technical details
The hickory-proto crate's zone file parser contains an improper input validation flaw that causes an unhandled panic when encountering a token of 4096 bytes or longer. The vulnerability affects versions 0.24.0 through 0.26.1 and requires only network access to supply an untrusted zone file; no authentication or user interaction is required. An attacker can trigger a denial of service by crafting a malicious zone file, and the flaw is addressed in version 0.26.2.
Affected products
- Hickory DNS hickory-proto 0.24.0 to 0.26.1
Timeline
- 2026-09-03: disclosed
- 2026-11-08: advisory