What’s Vulnerable › Vulnerabilities
CVE-2026-33602: Off-by-one access when processing crafted UDP responses
- Severity: high (CVSS 8.2 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-22 · updated 2026-10-26
- Weakness: CWE-122
Description
A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value, triggering an out-of-bounds write leading to a denial of service.
Affected products
- PowerDNS DNSdist: from 1.9.0 before 1.9.13; from 2.0.0 before 2.0.4 — fixed in 1.9.13, 2.0.4
How to fix
Upgrade to a fixed version: PowerDNS DNSdist 1.9.13, 2.0.4. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-33602 or the next vulnerability affects your stack