Description
Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 and hickory-net before 0.26.1 contain an unbounded loop vulnerability in DnssecDnsHandle NSEC3 closest-encloser proof validation when the SOA owner is not an ancestor of the QNAME. Upstream attackers can return NoData or NXDomain responses with a cross-zone SOA record to panic debug builds or exhaust memory in release builds.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| hickory-dns | hickory-dns | 0.25.0-alpha.3 – ≤ 0.25.2, 0.26.0-alpha.1 – < 0.26.1 | 0.26.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | rust-hickory-proto | No fix yet | — |
| Ubuntu 26.04 LTS | rust-hickory-proto | No fix yet | — |
| Ubuntu 24.04 LTS | rust-hickory-proto | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | hickory-net | >= 0.26.0-alpha.1, < 0.26.1 | 0.26.1 | GHSA-3v94-mw7p-v465 |
| crates.io | hickory-net | >= 0.0.0-0, < 0.26.1 | 0.26.1 | RUSTSEC-2026-0120 |
| crates.io | hickory-proto | >= 0.25.0-alpha.3, <= 0.25.2 | — | GHSA-3v94-mw7p-v465 |
| crates.io | hickory-proto | >= 0.25.0-alpha.3, < 0.26.0-beta.1 | 0.26.0-beta.1 | RUSTSEC-2026-0118 |
References
- GitHub Security Advisory (GHSA-3v94-mw7p-v465) vendor-advisory
- VulnCheck Advisory: Hickory DNS NSEC3 Closest-Encloser Proof Unbounded Loop Denial of Service third-party-advisory