CVE-2026-40622 Affecting python3-unbound-debuginfo package, versions <0:1.24.2-3.el9_8.2


Severity

Recommended
0.0
high
0
10

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.14% (4th percentile)

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  • Snyk IDSNYK-ROCKY9-PYTHON3UNBOUNDDEBUGINFO-18384982
  • published29 Jul 2026
  • disclosed20 May 2026

Introduced: 20 May 2026

CVE-2026-40622  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:9 python3-unbound-debuginfo to version 0:1.24.2-3.el9_8.2 or higher.
This issue was patched in RLSA-2026:36777.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-unbound-debuginfo package and not the python3-unbound-debuginfo package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:9 relevant fixed versions and status.

NLnet Labs Unbound 1.16.2 up to and including version 1.25.0 has a vulnerability of the 'ghost domain names' family of attacks that could extend the ghost domain window by up to one cached TTL configured value. Similar to other 'ghost domain names' attacks, an adversary needs to control a (ghost) zone and be able to query a vulnerable Unbound. A single client NS query can cause Unbound to overwrite the cached expired parent-side referral NS rrset with the child-side apex NS rrset and essentially extend the ghost domain window by up to one cached TTL configured value ('cache-max-ttl'). In configurations where 'harden-referral-path: yes' is used (non-default configuration), no client NS query is required since Unbound implicitly performs that query. Unbound 1.25.1 contains a patch with a fix that does not allow extension of TTLs for (parent) NS records regardless of their trust.

CVSS Base Scores

version 3.1