CVE-2026-42409
When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traff…
Published May 13, 2026 · corrected/updated Jun 23, 2026 · f5 big-ip next cloud-native network functions · evidence confidence medium
When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-42409 is a high public vulnerability record for f5 big-ip next cloud-native network functions. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether f5 big-ip next cloud-native network functions is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: f5/big-ip access policy manager; f5/big-ip access policy manager (21.0.0); f5/big-ip advanced firewall manager (21.0.0); f5/big-ip advanced web application firewall (21.0.0). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 8.7. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-476. Sources contributing to this record: cve_org, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
May 13, 2026 · NIST NVD
Detected
When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Jun 23, 2026 · NIST NVD
Updated
When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Affected
- cpe f5/big-ip access policy managerversion unspecified
- cpe f5/big-ip access policy manager21.0.0
- cpe f5/big-ip advanced firewall manager21.0.0
- cpe f5/big-ip advanced web application firewall21.0.0
- cpe f5/big-ip analytics21.0.0
- cpe f5/big-ip application acceleration manager21.0.0
- cpe f5/big-ip next cloud-native network functionsversion unspecified
- cpe f5/big-ip next for kubernetesversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-42409
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-42409
When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate. Note: Software versions which have reached End of Technica
nvd.nist.gov