What’s Vulnerable › Vulnerabilities

CVE-2026-29775: FreeRDP has a heap-buffer-overflow in bitmap_cache_put via OOB cacheId

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-13 · updated 2026-06-17
• Weakness: CWE-787

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a client-side heap out-of-bounds read/write occurs in FreeRDP's bitmap cache subsystem due to an off-by-one boundary check in bitmap_cache_put. A malicious server can send a CACHE_BITMAP_ORDER (Rev1) with cacheId equal to maxCells, bypassing the guard and accessing cells[] one element past the allocated array. This vulnerability is fixed in 3.24.0.

Affected products

• FreeRDP: before 3.24.0 — fixed in 3.24.0

How to fix

Upgrade to a fixed version: FreeRDP 3.24.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/commit/ffad58fd2b329efd81a3239e9d7e3c927b8e503f
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h666-rfw3-jhvj
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h666-rfw3-jhvj

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