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CVE-2026-39458 (GCVE-0-2026-39458)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-08-24 21:39
VLAI
Title
BIG-IP DNS Cache vulnerability
Summary
When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High)
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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 15:57 UTC
CWE
  • CWE-824 - Access of Uninitialized Pointer
Assigner
References
URL Tags
https://my.f5.com/manage/s/article/K000160945 vendor-advisorypatch
Impacted products
Vendor Product Version CPE status
F5 BIG-IP Unaffected: 21.1.0 , < * (custom)
Affected: 21.0.0 , < 21.0.0.1 (custom)
Affected: 17.5.0 , < 17.5.1.6 (custom)
Affected: 17.1.0 , < 17.1.3.2 (custom)
Affected: 16.1.0 , < * (custom)
guessed Create a notification for this product.
Date Public
2026-05-13 14:00
Credits
F5
Show details on NVD website
To clipboard 

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    "redhat_vex": {
      "current_release_date": "2026-06-05T19:12:50+00:00",
      "cve": "CVE-2026-39458",
      "id": "CVE-2026-39458",
      "initial_release_date": "2026-05-13T14:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "BIG-IP DNS Cache vulnerability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39458.json",
      "version": "3"
    },
    "vulnrichment": {
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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.