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NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could ren…

Medium CVSS 5.3
CVECVE-2026-42534
First seen2026-07-29 14:15 UTC
Disclosed2026-05-20 10:16 UTC
Last updated2026-07-29 14:15 UTC
Channel statusauto

Summary

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running queries and not allow the jostle logic to see them as aged and potential targets for replacement with new queries. An adversary who can query a vulnerable Unbound and who can control a domain name server that replies slowly and/or maliciously to Unbound's queries can explo…

In-depth triage · Auto channel

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Affected products

  • :
Lint boundary warnings (1)

The following non-blocking warnings were raised during the lint phase of this triage (e.g. reference URLs not yet on the allowlist). They do not affect entry usability and are disclosed for transparency (see DR-002).

  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42534.txt

Sources

  • NVD DATABASE

Original Links

Timeline

  1. nvd_ingest NVD