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Highest advisory severityLow 1 vendor · 1 advisory

CVE-2026-42955

CVE-2026-42955: 1 tracked advisory record across Red Hat. Compare source-reported impact, fixes and remediation.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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Vendor advisory comparison

Red Hat

1 advisory
  • Advisory severityLow3.7

    Low [CVE-2026-42955] DNS cache integrity issue

    CVE-2026-42955Source published Source updated

    In NLnet Labs Unbound 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the 'ghost domain names' family of attacks was found in Unbound that could extend the ghost domain window by up to one cached TTL configured value for A/AAAA glue records. 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 A/AAAA query can cause Unbound to overwrite the cached expired parent-side glue 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 query is required since Unbound implicitly performs that query. This is a…

    Affected products in this advisory
    • Red Hat Hardened Images
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 8
    • Red Hat Enterprise Linux 9

    2 more entries in the full advisory.

    Source-reported affected versions
    • 1.16.2
    • 1.25.1
    Source-reported fixed versions
    • unbound-main-1.25.2-0.1.hum1
    • RHSA-2026:43588
    Mitigation guidance
    • To mitigate this issue, ensure harden-referral-path is set to no (the default) to prevent Unbound from implicitly triggering the vulnerable cache overwrites. Additionally, restrict recursive DNS access strictly to trusted clients to prevent external attackers from manually triggering the flaw. Restart the Unbound service to apply these configuration changes.
    Full advisory and evidenceOpen source bulletin

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