CVE-2026-42058: CWE-732 Incorrect Permission Assignment for Critical Resource in F5 BIG-IP
An authenticated attacker's undisclosed requests to BIG-IP iControl REST can lead to an information leak of BIG-IP local user account names. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-42058) in F5 BIG-IP arises from incorrect permission assignment (CWE-732) for critical resources accessed via the iControl REST interface. Authenticated attackers can send certain undisclosed requests that result in the leakage of local user account names. The issue affects multiple versions of BIG-IP, specifically 16.1.0, 17.1.0, 17.5.0, and 21.0.0. The CVSS v3.1 base score is 4.3, indicating medium severity, with the vector showing network attack vector, low attack complexity, required privileges, no user interaction, and confidentiality impact only. No official remediation or patch has been announced, and no exploits are currently known in the wild.
Potential Impact
An authenticated attacker can obtain information about local user account names on the BIG-IP system via the iControl REST interface. This information disclosure could aid in further targeted attacks or reconnaissance but does not directly impact system integrity or availability. The confidentiality impact is limited to user account name leakage.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or workaround has been provided, monitor vendor communications for updates. Limit access to the iControl REST interface to trusted administrators to reduce exposure.
CVE-2026-42058: CWE-732 Incorrect Permission Assignment for Critical Resource in F5 BIG-IP
Description
An authenticated attacker's undisclosed requests to BIG-IP iControl REST can lead to an information leak of BIG-IP local user account names. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS v3.1
Score 4.3medium
Affected software
pkg:github/f5networks/big-ipRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-42058) in F5 BIG-IP arises from incorrect permission assignment (CWE-732) for critical resources accessed via the iControl REST interface. Authenticated attackers can send certain undisclosed requests that result in the leakage of local user account names. The issue affects multiple versions of BIG-IP, specifically 16.1.0, 17.1.0, 17.5.0, and 21.0.0. The CVSS v3.1 base score is 4.3, indicating medium severity, with the vector showing network attack vector, low attack complexity, required privileges, no user interaction, and confidentiality impact only. No official remediation or patch has been announced, and no exploits are currently known in the wild.
Potential Impact
An authenticated attacker can obtain information about local user account names on the BIG-IP system via the iControl REST interface. This information disclosure could aid in further targeted attacks or reconnaissance but does not directly impact system integrity or availability. The confidentiality impact is limited to user account name leakage.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or workaround has been provided, monitor vendor communications for updates. Limit access to the iControl REST interface to trusted administrators to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- f5
- Date Reserved
- 2026-04-30T23:04:20.031Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a049711cbff5d8610dff67d
Added to database: 05/13/2026, 15:21:53 UTC
Last enriched: 07/02/2026, 21:04:47 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 68
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