Vulnerability · Published May 13, 2026 · Assigned by f5
CVE-2026-40629BIG-IP SSL/TLS vulnerability
High 7.5
In plain English
A high-severity resource allocation without limits in BIG-IP from F5. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 74.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
When SSL profiles are configured on a virtual server, undisclosed traffic can cause the virtual server to stop processing new client connections. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| F5 | BIG-IP | 17.5.0 – before 17.5.1.417.1.0 – before 17.1.3.116.1.0 – before * |
| F5 | BIG-IP Next SPK | 2.0.0 – before 2.0.31.7.0 – before 1.7.16 |
| F5 | BIG-IP Next CNF | 2.0.0 – before 2.0.31.1.0 – before 1.4.1 |
| F5 | BIG-IP Next for Kubernetes | 2.0.0 – before 2.1.1 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://my.f5.com/manage/s/article/K000158978 vendor-advisory, patch