What’s Vulnerable › Vulnerabilities

CVE-2026-57156: FreeRDP: Integer overflow leading to heap buffer overflow in Orders Delta Points parsing

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-10 · updated 2026-07-15
• Weakness: CWE-122

Description

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.

Affected products

• FreeRDP: before 3.28.0 — fixed in 3.28.0

How to fix

Upgrade to a fixed version: FreeRDP 3.28.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/commit/487f35daccb36a6224e530dcd8fa60850825f823
• https://github.com/FreeRDP/FreeRDP/pull/12938
• https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v5wf-j8j4-77h7
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v5wf-j8j4-77h7

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