CVE-2026-33984 | FreeRDP up to 3.24.1 libfreerdp/codec/clear.c resize_vbar_entry heap-based overflow

VDB-354275 · CVE-2026-33984 · EUVD-2026-17229 FREERDP UP TO 3.24.1 LIBFREERDP/CODEC/CLEAR.C RESIZE_VBAR_ENTRY HEAP-BASED OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.1 $0-$5k 2.10 Summaryinfo A vulnerability was found in FreeRDP up to 3.24.1. It has been classified as critical. This impacts the function resize_vbar_entry of the file libfreerdp/codec/clear.c. The manipulation leads to heap-based overflow. This vulnerability is referenced as CVE-2026-33984. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended. Detailsinfo A vulnerability was found in FreeRDP up to 3.24.1. It has been rated as critical. This issue affects the function resize_vbar_entry of the file libfreerdp/codec/clear.c. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to 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(). Impacted is confidentiality, integrity, and availability. The summary by CVE is: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-33984 since 03/24/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 3.24.2 eliminates this vulnerability. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-17229). Productinfo Type Remote Access Software Name FreeRDP Version 3.24.0 3.24.1 License open-source Website Product: https://github.com/FreeRDP/FreeRDP/ CPE 2.3info 🔒 🔒 CPE 2.2info 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.2 VulDB Meta Temp Score: 6.1 VulDB Base Score: 5.0 VulDB Temp Score: 4.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.5 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Heap-based overflow CWE: CWE-122 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: FreeRDP 3.24.2 Timelineinfo 03/24/2026 CVE reserved 03/30/2026 +6 days VulDB entry created 03/31/2026 +0 days Advisory disclosed 03/31/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-33984 (🔒) GCVE (CVE): GCVE-0-2026-33984 GCVE (VulDB): GCVE-100-354275 EUVD: 🔒 Entryinfo Created: 03/31/2026 00:20 Updated: 03/31/2026 03:38 Changes: 03/31/2026 00:20 (65), 03/31/2026 03:38 (1) Complete: 🔍 Cache ID: 99:279:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸