Last Modified: Jun 04, 2026
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3, 17.1.3.1, 17.1.3.2, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 17.5.1.5, 17.5.1.6, 21.0.0, 21.0.0.1
Opened: May 21, 2026 Severity: 2-Critical
BIG-IP has http profile settings max-header-size. This value defines the upper limit for the size of the HTTP header block in either request or response
TMM may crash, causing a failover and interruption in traffic processing
The virtual server is equipped with HTTP2 or HTTP3 profiles, and it uses an HTTP profile with a large max-header-size setting
Reduce the value of the max-header-size setting to a reasonable one. Consult F5 Support for more details
None