highVulnerability
GHSA-6w6g-hm98-mhgm
When the `hickory-resolver` name server pool implementation receives an upstream response with the TC (truncated) header bit set, it re-queues the request to the same nameserver to retry with UDP transport disabled. However, the retry arm never inspects the transport that just answered and carries no iteration counter. An authoritative server that sets `TC=1` on **every** available transport keeps the resolver spinning on one persistent TCP connection until the 5s per-request wall-clock deadline expires. ### Reporter Qifan Zhang, Palo Alto Networks
Properties
- ghsa_id
- GHSA-6w6g-hm98-mhgm
- summary
- hickory-resolver: Unbounded TC-retry loop in `NameServerPool::try_send` (resource-exhaustion DoS)
- severity
- high
- last_source
- GitHub Advisory Database
- cve_id
- GHSA-6w6g-hm98-mhgm
- signal_observed_at
- 2026-10-06T02:58:31+00:00
- is_ghsa_only
- true
- retrieved_at
- 2026-10-06T03:05:59+00:00
- ghsa_published
- 2026-10-05T22:55:10Z
- source_url
- https://github.com/advisories/GHSA-6w6g-hm98-mhgm
- ghsa_updated
- 2026-10-05T22:55:12Z
Related Entities (6)
HAS_WEAKNESS (3)
→[Weakness]Loop with Unreachable Exit Condition ('Infinite Loop')
→[Weakness]Uncontrolled Resource Consumption
→[Weakness]Insufficient Control of Network Message Volume (Network Amplification)
REPORTED_BY (1)
→[Source]GitHub Advisory Database
VULNERABLE_TO (1)
←[Software]rust/hickory-resolver
AFFECTS (1)
→[Software]rust/hickory-resolver
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