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CVE-2026-67300 FreeRDP CVE debrief

FreeRDP before 3.29.0 contains client-side heap use-after-free vulnerabilities in the async update message proxy for RAIL WINDOW_STATE_ORDER and NOTIFY_ICON_STATE_ORDER when AsyncUpdate is enabled. A malicious or compromised RDP server can exploit these vulnerabilities by sending crafted update orders, potentially causing memory corruption or a client crash. The CVE record was published on 2026-08-01T13:16:59.393Z and has not been modified since then. Organizations using FreeRDP should prioritize updating to the latest version and review compensating controls for exposed systems. Security teams should also review their asset inventory and consider rollback/change windows for remediation. The vulnerabilities are particularly concerning for organizations with RDP servers exposed to untrusted users. Evidence is limited in the provided source corpus, so organizations should verify their deployments and review official advisories.

Vendor
FreeRDP
Product
Unknown
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-01
Original CVE updated
2026-08-31
Advisory published
2026-08-01
Advisory updated
2026-08-31

Who should care

Organizations using FreeRDP before version 3.29.0, particularly those with RDP servers exposed to untrusted users, should prioritize updating to the latest version to mitigate the client-side heap use-after-free vulnerabilities. This includes reviewing compensating controls for exposed systems and monitoring RDP server activity for suspicious behavior. Security teams should also review their asset inventory and consider rollback/change windows for remediation.

Technical summary

FreeRDP before 3.29.0 contains client-side heap use-after-free vulnerabilities in the async update message proxy for RAIL WINDOW_STATE_ORDER and NOTIFY_ICON_STATE_ORDER when AsyncUpdate is enabled. A malicious or compromised RDP server can exploit these vulnerabilities by sending crafted update orders, potentially causing memory corruption or a client crash. Organizations using FreeRDP should prioritize updating to the latest version.

Defensive priority

Organizations using FreeRDP before version 3.29.0 should prioritize updating to the latest version to mitigate the client-side heap use-after-free vulnerabilities.

Recommended defensive actions

  • Update FreeRDP to version 3.29.0 or later
  • Restrict access to RDP servers to trusted users
  • Monitor RDP server activity for suspicious behavior
  • Review compensating controls for exposed systems
  • Review asset inventory and consider rollback/change windows for remediation
  • Track exceptions and retest remediated assets

Evidence notes

The CVE record indicates that FreeRDP before 3.29.0 contains client-side heap use-after-free vulnerabilities in the async update message proxy for RAIL WINDOW_STATE_ORDER and NOTIFY_ICON_STATE_ORDER when AsyncUpdate is enabled. However, detailed information about the vulnerabilities is limited in the provided source corpus. Organizations should verify their deployments, review official advisories, and consider compensating controls.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-67300 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-67300

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-67300 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-67300

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.