CVE-2026-33986 | FreeRDP up to 3.24.1 libfreerdp/codec/h264.c yuv_ensure_buffer heap-based overflow

VDB-354277 · CVE-2026-33986 · EUVD-2026-17233 FREERDP UP TO 3.24.1 LIBFREERDP/CODEC/H264.C YUV_ENSURE_BUFFER HEAP-BASED OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.1 $0-$5k 2.26 Summaryinfo A vulnerability was found in FreeRDP up to 3.24.1. It has been rated as critical. Affected by this vulnerability is the function yuv_ensure_buffer of the file libfreerdp/codec/h264.c. This manipulation causes heap-based overflow. This vulnerability is tracked as CVE-2026-33986. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised. Detailsinfo A vulnerability classified as critical was found in FreeRDP up to 3.24.1. Affected by this vulnerability is the function yuv_ensure_buffer of the file libfreerdp/codec/h264.c. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is 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(). As an impact it is known to affect 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 yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2. The advisory is shared at github.com. This vulnerability is known as CVE-2026-33986 since 03/24/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. Upgrading to version 3.24.2 eliminates this vulnerability. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-17233). 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-2026-33986 (🔒) GCVE (CVE): GCVE-0-2026-33986 GCVE (VulDB): GCVE-100-354277 EUVD: 🔒 Entryinfo Created: 03/31/2026 00:20 Updated: 03/31/2026 02:30 Changes: 03/31/2026 00:20 (65), 03/31/2026 02:30 (1) Complete: 🔍 Cache ID: 99:DAC:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸