What is GHSA-6rvc-hrvg-mqf2?

GHSA-6rvc-hrvg-mqf2 is a security advisory published by GitHub Security Advisories with High severity. The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates...

Which CVE IDs does GHSA-6rvc-hrvg-mqf2 cover?

GHSA-6rvc-hrvg-mqf2 covers the following CVE IDs: CVE-2026-123570. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-6rvc-hrvg-mqf2?

GHSA-6rvc-hrvg-mqf2 has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

GHSA-6rvc-hrvg-mqf2HighCVSS 7.5

The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates...

Vendor

GitHub Security Advisories

Published

November 8, 2026

Last Modified

November 8, 2026

🔗 CVE IDs covered (1)

CVE-2026-123570 →

📋 Description

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.

🔗 References (4)

https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-67wc-6jq8-ghrc
https://nvd.nist.gov/vuln/detail/CVE-2026-123570
https://www.vulncheck.com/advisories/hickory-dns-from-0.18-before-0.26.2-memory-amplification-dos-via-rr-counts
https://github.com/advisories/GHSA-6rvc-hrvg-mqf2