Description
Hickory DNS from 0.26.0 before 0.26.2 contains an integer underflow vulnerability in TSIG RDATA decoding that allows remote attackers to trigger a panic via malformed records. Attackers can send a crafted TSIG record in DNS wire format to cause unchecked subtraction underflow, crashing builds with overflow checks enabled and causing denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| hickory-dns | hickory-dns | 0.26.0 – < 0.26.2 | 0.26.2 |
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | rust-hickory-dns | 0.26.3-1 | — |
| Debian 13 | rust-hickory-dns | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | rust-hickory-dns | No fix yet | — |
| Ubuntu 26.04 LTS | rust-hickory-dns | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | hickory-proto | >= 0.26.0, < 0.26.2 | 0.26.2 | RUSTSEC-2026-0488 |
References
- GitHub Security Advisory (GHSA-x962-5xwx-fr8x) vendor-advisory
- VulnCheck Advisory: Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding third-party-advisory