CVE-2026-18236
ADK continuation forgery allows forging confirmations to run unauthorized agent tools
Is CVE-2026-18236 being exploited?
Not confirmed. CVE-2026-18236 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 0.38% probability of exploitation in the next 30 days.
How severe is CVE-2026-18236?
CVE-2026-18236 is rated Critical with a CVSS score of 9.3. 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-2026-18236?
Not known from our data. No patch reference has been recorded for CVE-2026-18236, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-18236 affect?
CVE-2026-18236 affects Agent Development Kit (ADK), Agent frameworks using ADK, Custom agent deployments using ADK. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18236?
Restrict/monitor event sources, block untrusted event injection, enforce tool registration and confirmation validation; apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Injected session events can forge tool confirmations to execute unauthorized agent tools, enabling remote unauthorized actions and potential escalation via the agent framework.
Immediate action required
- affected< 2.5.0
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.