---
id: RUSTSEC-2026-0310
title: 'Various panics, soundness and resource exhaustion issues'
summary: 'Various panics, soundness and resource exhaustion issues'
severity: none
vendor: domain
product: domain
ecosystem: rust
affected:
  - 'domain >= 0.0.0-0, < 0.12.3'
patched:
  - domain 0.12.3
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T18:00:04.476715679Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2026-0310'
references:
  - url: 'https://crates.io/crates/domain'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0310.html'
  - url: 'https://github.com/NLnetLabs/domain/releases/tag/v0.12.3'
tags:
  - osv
  - rust
ingestedAt: '2026-09-26T07:17:57.339Z'
---

## Overview

Version 0.12.3 fixes a large number of panics, soundness issues, and
CPU and memory exhaustion issues in all parts of the crate.

The following is a summary of the issues per affected components.
For details, please see the [release
notes](https://github.com/NLnetLabs/domain/releases/tag/v0.12.3).

## Base

* Limited the number of compression pointers that are followed when parsing
  a compressed name to 255 to avoid following really long chains.
* Limited the length of CNAME chains followed by `Message::canonical_name`
  to 20. This also fixed an integer overflow in this method when ANCOUNT
  was`u16::MAX`.
* Changed `QuestionSection::answer` to skip over all remaining questions
  without parsing the QNAMEs to avoid being slowed down by malicious
  names.
* Added length checks when scanning and parsing variable length record
  data types. This fixes issues with the message builder, which assumes that
  record data is never too large for placing in a message.

## Stub Resolver

* Fixed possible panics in the resolver’s `FoundHosts::qname` and
  `FoundHosts::canonical_name`.
* Fixed various issues in SRV processing.

## Zonefile parsing

* Fixed soundness issues when reading UTF-8 and an integer overflow when
  reading unsigned integers.
* Fixed a panic when reading empty TXT records.

## Client and server transports, DNSSEC signer and validator

Fixed various panics that could be triggered by malicious incoming DNS
messages.

## Zonetree

Fixed various panics and a memory exhaustion issue when updating the zone.

## Acknowledgements

We would like to thank Qifan Zhang, Palo Alto Networks,
Antoni (Tony) Jagodka ([@DrVelvetFog](https://github.com/DrVelvetFog)),
and [@SebastiaanYN](https://github.com/SebastiaanYN) for
reporting issues fixed in this release.

## Affected packages

- `domain >= 0.0.0-0, < 0.12.3`

## Remediation

Upgrade to a patched release:

- `domain 0.12.3`