GHSA-6w6g-hm98-mhgm

Suggest an improvement
Source
https://github.com/advisories/GHSA-6w6g-hm98-mhgm
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-6w6g-hm98-mhgm/GHSA-6w6g-hm98-mhgm.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-6w6g-hm98-mhgm
Published
2026-10-05T22:55:10Z
Modified
2026-10-05T23:15:03Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
hickory-resolver: Unbounded TC-retry loop in `NameServerPool::try_send` (resource-exhaustion DoS)
Details

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

Database specific 
{
    "cwe_ids":  [
        "CWE-400",
        "CWE-406",
        "CWE-835"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-05T22:55:10Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}
References

Affected packages

crates.io / hickory-resolver

Package

Name
hickory-resolver
View open source insights on deps.dev
Purl
pkg:cargo/hickory-resolver

Affected ranges

Type
SEMVER
Events
Introduced
0.26.0-beta.1
Fixed
0.26.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-6w6g-hm98-mhgm/GHSA-6w6g-hm98-mhgm.json"