Bug ID 1227521: BIG-IP IdP fails to log XML parse errors for malformed Base64-encoded SAML requests

Last Modified: Sep 21, 2026

Affected Product(s):
BIG-IP APM(all modules)

Known Affected Versions:
16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 16.1.6.1

Opened: Jan 19, 2023

Severity: 3-Major

Symptoms

The appropriate log is not displayed when XML parsing fails due to incorrect base64-encoded input

Impact

Troubleshooting malformed SAML requests becomes difficult for administrators

Conditions

- BIG-IP configured as a SAML Identity Provider (IdP) - SAML AuthnRequest received through HTTP POST binding - The SAMLRequest parameter contains malformed data or incorrectly Base64-encoded XML - XML parsing of the decoded AuthnRequest fails

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips