Buffer overflow in Freerdp
CVE-2026-57156
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0 on 32-bit builds, FreeRDP clients contain an integer overflow in update_read_delta_points in libfreerdp/core/orders.c when multiplying an attacker-controlled point count by sizeof(DELTA_POINT), allowing a malicious RDP peer to allocate an undersized heap buffer and then write beyond it during initialization. This issue is fixed in version 3.28.0.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Freerdp — versions < 3.28.0
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v5wf-j8j4-77h7 (Exploit, Mitigation, Vendor Advisory)
- github.com/FreeRDP/FreeRDP/pull/12938 (Patch, Issue Tracking)
- github.com/FreeRDP/FreeRDP/commit/487f35daccb36a6224e530dcd8fa60850825f823 (Patch)
- github.com/FreeRDP/FreeRDP/releases/tag/3.28.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-57156?
- CVE-2026-57156 is a critical-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-07-10.
- How severe is CVE-2026-57156?
- Critical severity. CVSS v3 base score is 9.8 out of 10.