CVE-2026-14540
SSRF in Google mcp-toolbox allows server to request internal or arbitrary endpoints.
Is CVE-2026-14540 being exploited?
Not confirmed. CVE-2026-14540 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.12% probability of exploitation in the next 30 days.
How severe is CVE-2026-14540?
CVE-2026-14540 is rated High with a CVSS score of 8.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-14540?
Yes. A fix has been recorded for CVE-2026-14540. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-14540 affect?
CVE-2026-14540 affects Google mcp-toolbox 0.3.0-1.4.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-14540?
Upgrade to vendor patch when released; enforce CheckRedirect and block private IP ranges.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
SSRF lets attackers force toolbox to make requests to internal/external endpoints, access cloud metadata/internal APIs, exfiltrate data or pivot.
Immediate action required
- affected>= 0.3.0 and <= 1.4.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.