CVE-2026-42408

Sensitive-information disclosure via undisclosed tmsh command

Published May 13, 2026 · Updated May 13, 2026

Information disclosure in F5 BIG-IP DNS allows highly privileged local users to view sensitive information through tmsh. F5 has not published the affected tmsh command or the operation that exposes the data, so the exact information returned remains undisclosed. Exploitation requires BIG-IP DNS provisioning and high local privileges; the documented effect is read-only disclosure without integrity or availability impact.

CVSS severity6.7
Medium
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in F5 BIG-IP DNS allows highly privileged local users to view sensitive information through tmsh. F5 has not published the affected tmsh command or the operation that exposes the data, so the exact information returned remains undisclosed. Exploitation requires BIG-IP DNS provisioning and high local privileges; the documented effect is read-only disclosure without integrity or availability impact.

The record

CVE
CVE-2026-42408
Published
May 13, 2026
Updated
May 13, 2026
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-312, CAPEC-37, T1005
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.1.0 <*
  2. Affected versionversion=17.1.0 <17.1.3.1
  3. Affected versionversion=17.5.0 <17.5.1.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

F5 Networks · BIG-IPversion=16.1.0 <*; version=17.1.0 <17.1.3.1; version=17.5.0 <17.5.1.4

Published CVSS scores

6.7F5 NetworksCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X
4.4F5 NetworksCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
CAPEC-37Retrieve Embedded Sensitive Data
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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