Description
Hickory DNS before 0.26.2 contains a resource exhaustion vulnerability in its DNS-over-HTTPS HTTP/2 server that lacks sufficient timeouts or limits for incomplete request bodies. Remote attackers can open DoH connections, send incomplete request bodies, and hold connections open to exhaust server memory.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| hickory-dns | hickory-dns | < 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 | — |
References
- GitHub Security Advisory (GHSA-g5xf-qv55-wv37) vendor-advisory
- VulnCheck Advisory: Hickory DNS before 0.26.2 DoH Memory Exhaustion via Incomplete Request Bodies third-party-advisory