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Advisory record · GHSA-6w6g-hm98-mhgm

hickory-resolver: Unbounded TC-retry loop in `NameServerPool::try_send` (resource-exhaustion DoS)

CVSS 4.0, no score published

Published by the GitHub Advisory Database at 5 Oct 2026, 22:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
hickory-resolvercrates.io>=0.26.0-beta.1, <0.26.20.26.2
Identifiers
GHSA-6w6g-hm98-mhgm
Weakness (CWE)
CWE-400 · CWE-406 · CWE-835
Tags
Published
5 Oct 2026
Updated
5 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The hickory-resolver crate, versions 0.26.0-beta.1 up to but not including 0.26.2, has an unbounded retry loop when a response has the TC (truncated) bit set. An attacker who controls or can impersonate an authoritative name server can set TC on every transport, causing the resolver to keep retrying over one TCP connection until the 5-second per-request deadline expires, which exhausts resources. Upgrade to hickory-resolver 0.26.2.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
Not published None 4.0 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 GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.