PT-2026-67271 · Freerdp · Freerdp

1121984919 · CVE-2026-67291 · Published 2026-08-01 · Updated 2026-08-01

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions FreeRDP versions prior to 3.29.0

Description A heap out-of-bounds read exists in the update process glyph fragments() and glyph cache fragment put() functions within libfreerdp/cache/glyph.c. The issue occurs during the handling of a GLYPH FRAGMENT ADD update, where the system reads a one-byte server-controlled declared fragment size without verifying if it fits within the remaining received buffer before allocation and copying. A malicious RDP server can trigger this by sending a short fragment with an oversized declared size, causing the client to read beyond the allocated buffer and crash.

Recommendations Update to version 3.29.0 or later.

Exploit

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-67291

GHSA-HGJ8-G595-WFC6

Affected Products

Freerdp

References · 6

• 🔥 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hgj8-g595-wfc6 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67291.json · Exploit
• https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-67291 · Security Note
• https://osv.dev/vulnerability/CVE-2026-67291 · Vendor Advisory
• https://vulncheck.com/advisories/freerdp-before-heap-out-of-bounds-read-via-glyph-fragment-add · Note