Rust advisories / trust-dns-server
Vulnerability HighRUSTSEC-2020-0001 · trust-dns-server
RUSTSEC-2020-0001: Stack overflow when resolving additional records from MX or SRV null targets
Short answerA security vulnerability in the trust-dns-server crate: Stack overflow when resolving additional records from MX or SRV null targets. High severity (CVSS 7.5). Fixed in 0.18.1: update to a fixed version.
| Crate | trust-dns-server |
|---|---|
| Type | Vulnerability (denial-of-service) |
| Affected versions | From 0.16.0 before 0.18.1. |
| Fixed in | 0.18.1 |
| Severity | High, CVSS 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published | 2020-01-06 |
| Last changed | 2023-11-08 |
| Also known as | CVE-2020-35857, GHSA-4cww-f7w5-x525 |
What to do
- See which version you have:
cargo tree -i trust-dns-server(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p trust-dns-server. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for exampletrust-dns-server = "0.18.1") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
There's a stack overflow leading to a crash and potential DOS when processing additional records for return of MX or SRV record types from the server.
This is only possible when a zone is configured with a null target for MX or SRV records, i.e. '.'.
Example effected zone record:
no-service 86400 IN MX 0 .Prior to 0.16.0 the additional record processing was not supported by trust-dns-server. There Are no known issues with upgrading from 0.16 or 0.17 to 0.18.1. The remidy should be to upgrade to 0.18.1. If unable to do so, MX, SRV or other record types with a target to the null type, should be avoided.
References
- Package: crates.io/crates/trust-dns-server
- Advisory: rustsec.org/advisories/RUSTSEC-2020-0001.html
- Report: github.com/bluejekyll/trust-dns/issues/980
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
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