CVE-2026-33987
Received Received - Intake
Heap Overflow in FreeRDP Persistent Cache Causes Memory Corruption

Publication date: 2026-03-30

Last updated on: 2026-04-01

Assigner: GitHub, Inc.

Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2.
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Meta Information
Published
2026-03-30
Last Modified
2026-04-01
Generated
2026-06-16
AI Q&A
2026-03-31
EPSS Evaluated
2026-06-15
NVD
CVE-2026-33987
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
freerdp freerdp to 3.24.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-131 The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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Executive Summary

This vulnerability exists in FreeRDP, a free implementation of the Remote Desktop Protocol, in versions prior to 3.24.2. The issue occurs in the function persistent_cache_read_entry_v3() within the file libfreerdp/cache/persistent.c. Specifically, the variable persistent->bmpSize is updated before a memory reallocation function (winpr_aligned_recalloc()) is called. If this reallocation fails, bmpSize becomes inflated while bmpData still points to the old memory buffer, leading to inconsistent state and potential memory corruption.

Impact Analysis

The vulnerability can lead to memory corruption due to the mismatch between bmpSize and the actual memory buffer bmpData points to. According to the CVSS score (7.1), it has a low attack vector (local), low attack complexity, no privileges required, but requires user interaction. The impact includes high integrity and availability damage, meaning an attacker could potentially cause application crashes or manipulate data, disrupting service or causing denial of service.

Mitigation Strategies

To mitigate this vulnerability, update FreeRDP to version 3.24.2 or later, where the issue has been patched.

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