CVE-2026-123570: Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts
Fixed in 0.26.2 · Affected: hickory-dns before 0.26.2 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 35% of scored CVEs
DescriptionCVE.org
The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates record vectors sized by the untrusted ANCOUNT, NSCOUNT, and ARCOUNT header fields before reading record data. Remote attackers can send a UDP datagram, or a spoofed response to a client/resolver, with these counts set to 65535, forcing about 18MB of allocation per message.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- hickory-dns · hickory-dnsfrom 0.18 before 0.26.2
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- hickory-dns
- Published
- November 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-123570 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.