CVE-2026-57156: freerdp Heap Overflow

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.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0070

Probability of exploitation

0.49%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-122 CWE-122

CWE-190 Integer Overflow

Affected Products

Vendor	Product	Versions
freerdp	freerdp	< 3.28.0

References

Advisories & Patches

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

Exploits

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v5wf-j8j4-77h7 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v5wf-j8j4-77h7

Other References

https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-57156? +

CVE-2026-57156 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0070, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-57156? +

CVE-2026-57156 affects products from freerdp, specifically: freerdp. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-57156? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-57156