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CVE-2026-3039VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-3039· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 3 Nov 2026, 04:43 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
ISCBIND 9Affected
  • >=9.0.0 <=9.16.50
  • >=9.18.0 <=9.18.48
  • >=9.20.0 <=9.20.22
  • >=9.21.0 <=9.21.21
  • >=9.9.3-S1 <=9.16.50-S1
  • >=9.18.11-S1 <=9.18.48-S1
  • >=9.20.9-S1 <=9.20.22-S1
Fixed in–
GitHubisc/bind9pkg:github/isc/bind9Other threatsAffected
  • 9.0.0 – 9.21.0
7 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat recommends mitigating the issue by disabling TKEY-based GSS-API authentication in the named configuration file (/etc/named.conf) by removing or commenting out lines related to tkey-gssapi-keytab or tkey-gssapi-credential, then reloading the named service. This mitigation may cause a brief DNS service interruption. Customers should monitor Red Hat advisories for future patches.

Description

A vulnerability in BIND servers configured for TKEY-based GSS-API authentication allows remote attackers to cause excessive memory consumption by sending maliciously crafted packets. This can lead to a denial of service (DoS) condition. The issue specifically affects Red Hat deployments integrated with Active Directory or Kerberos where this authentication method is enabled. No patch is currently available, but mitigation involves disabling or commenting out TKEY GSS-API related configuration in named.conf and reloading the named service.

References

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