High-severity remote vulnerability in a widely used RDP library (FreeRDP) that can corrupt memory, leak data, or enable remote compromise of RDP proxy servers.
CVE-2026-121952
Out-of-bounds write in FreeRDP proxy allows heap corruption and data leakage.
do firstUpgrade to a fixed release: 3.32.2.
Is CVE-2026-121952 being exploited?
Not confirmed. CVE-2026-121952 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 0.50% probability of exploitation in the next 30 days.
How severe is CVE-2026-121952?
CVE-2026-121952 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-2026-121952?
Yes. A fix has been recorded for CVE-2026-121952. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-121952 affect?
CVE-2026-121952 affects FreeRDP < 3.32.2 (proxy component). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-121952?
Upgrade to FreeRDP 3.32.2+ and restrict/untrusted client access to proxies.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote client to FreeRDP proxy can trigger heap OOB write causing heap corruption, data leakage, crash, and potential remote code execution.
Immediate action required
- affected< 3.32.2
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.
cisa ssvc
- exploitation
- poc
- automatable
- yes
- technical impact
- total
Assessed by CISA 4 Nov 2026 (SSVC 2.0.3).
timeline
- 4 Nov 2026Published
- 4 Nov 2026CISA SSVC assessment: exploitation poc · same day later
- 4 Nov 2026CVE record last updated · same day later
- 6 Nov 2026Analysed by vulneraibility.com · 2 days later
also known as
- Advisorygithub.com /FreeRDP/FreeRDP/security/advisories/GHSA-xc85-4mqc-xgcx
- Advisoryvulncheck.com /advisories/freerdp-before-3.32.2-proxy-out-of-bounds-write-via-bitmap-cache-v2-
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- OSV: advisory aliases and downstream package versions
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.