CVE-2026-57158: freerdp Out-of-bounds Read

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. From 3.21.0 before 3.28.0, FreeRDP clients using the GFX pipeline contain an incomplete fix for CVE-2026-23530 in planar_decompress_plane_rle_only in libfreerdp/codec/planar.c, allowing a malicious RDP server to send a truncated RDPGFX_CMDID_WIRETOSURFACE_1 planar payload that reads one byte past the input buffer. This issue is fixed in version 3.28.0.

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CVSS v3.1 Score

9.1

CRITICAL

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

EPSS — Exploit Prediction

0.0069

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-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
freerdp	freerdp	3.21.0 — 3.28.0

References

Advisories & Patches

https://github.com/FreeRDP/FreeRDP/commit/a7e797626fcb7f1d556ce63febb84f9f4a822731 https://github.com/FreeRDP/FreeRDP/pull/12952 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mp3f-59pg-c5pp https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mp3f-59pg-c5pp

Exploits

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mp3f-59pg-c5pp https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mp3f-59pg-c5pp

Other References

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

Frequently Asked Questions

What is CVE-2026-57158? +

FreeRDP is a free implementation of the Remote Desktop Protocol. From 3.21.0 before 3.28.0, FreeRDP clients using the GFX pipeline contain an incomplete fix for CVE-2026-23530 in planar_decompress_plane_rle_only in libfreerdp/codec/planar.c, allowing a malicious RDP server to send a truncated RDPGFX_CMDID_WIRETOSURFACE_1 planar payload that reads one byte past the input buffer. This issue is fixed in version 3.28.0. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-57158? +

CVE-2026-57158 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0069, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-57158? +

CVE-2026-57158 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-2026-57158? +

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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