Answer in brief
CVE-2026-42409 records a High severity (CVSS 7.5) vulnerability in BIG-IP HTTP/2 vulnerability. The current sources do not mark it as known exploited. The current feed maps F5/BIG-IP (generic), F5/BIG-IP Next CNF (generic), F5/BIG-IP Next for Kubernetes (generic), F5/BIG-IP Next SPK (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps F5/BIG-IP (generic), F5/BIG-IP Next CNF (generic), F5/BIG-IP Next for Kubernetes (generic), F5/BIG-IP Next SPK (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| F5/BIG-IPgeneric | >=21.0.0 <21.0.0.1 || >=17.5.0 <17.5.1.4 || >=17.1.0 <17.1.3.1 || >=16.1.0 <* | 21.0.0.1, 17.5.1.4, 17.1.3.1, * |
| F5/BIG-IP Next CNFgeneric | >=2.0.0 <2.0.3 || >=1.4.0 <1.4.1 | 2.0.3, 1.4.1 |
| F5/BIG-IP Next for Kubernetesgeneric | >=2.0.0 <2.1.1 | 2.1.1 |
| F5/BIG-IP Next SPKgeneric | >=2.0.0 <2.0.3 || >=1.7.0 <1.7.17 | 2.0.3, 1.7.17 |
Published upstream
May 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 23, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-42409 records a High severity (CVSS 7.5) vulnerability in BIG-IP HTTP/2 vulnerability. The current sources do not mark it as known exploited. The current feed maps F5/BIG-IP (generic), F5/BIG-IP Next CNF (generic), F5/BIG-IP Next for Kubernetes (generic), F5/BIG-IP Next SPK (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps F5/BIG-IP (generic), F5/BIG-IP Next CNF (generic), F5/BIG-IP Next for Kubernetes (generic), F5/BIG-IP Next SPK (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| F5/BIG-IPgeneric | >=21.0.0 <21.0.0.1 || >=17.5.0 <17.5.1.4 || >=17.1.0 <17.1.3.1 || >=16.1.0 <* | 21.0.0.1, 17.5.1.4, 17.1.3.1, * |
| F5/BIG-IP Next CNFgeneric | >=2.0.0 <2.0.3 || >=1.4.0 <1.4.1 | 2.0.3, 1.4.1 |
| F5/BIG-IP Next for Kubernetesgeneric | >=2.0.0 <2.1.1 | 2.1.1 |
| F5/BIG-IP Next SPKgeneric | >=2.0.0 <2.0.3 || >=1.7.0 <1.7.17 | 2.0.3, 1.7.17 |
Published upstream
May 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 23, 2026
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.
Quoted source text, attributed separately from HOL analysis.