F5-K000159893: Medium severity F5 BIG-IP vulnerability

Published Feb 5, 2026
·
Updated

A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.

Affected Software

5 affected components
F5 BIG-IP=21.0.0
F5 BIG-IP>=17.5.0<=17.5.1, >=17.1.0<=17.1.3
F5 BIG-IP>=16.1.0<=16.1.6
F5 F5OS-A>=1.8.0<=1.8.3, >=1.5.1<=1.5.4
F5 F5OS-C>=1.8.0<=1.8.2, >=1.6.0<=1.6.4

Event History

Feb 5, 2026
Advisory Published
via F5·10:02 PM
Data Sourced
via F5·10:02 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of F5-K000159893?

The severity of F5-K000159893 is classified as a high threat to system availability.

2

How do I fix F5-K000159893?

To fix F5-K000159893, upgrade to the recommended versions specified in the advisory.

3

What problem does F5-K000159893 pose?

F5-K000159893 allows a remote attacker to exploit the HTTP client code, potentially causing an infinite loop and consuming CPU resources.

4

Which versions are affected by F5-K000159893?

F5-K000159893 affects specific versions of F5 BIG-IP and F5OS, including versions 17.5.0 to 17.5.1 and others listed in the advisory.

5

Who should be concerned about F5-K000159893?

Administrators and users of the affected F5 products should be concerned about F5-K000159893 due to its impact on system performance and availability.

Contact

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