SB2026041654 - Red Hat Enterprise Linux 9 update for freerdp
Published: April 16, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Heap-based buffer overflow (CVE-ID: CVE-2026-33984)
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in resize_vbar_entry() in libfreerdp/codec/clear.c when processing ClearCodec band data from a malicious RDP server. A remote attacker can send crafted ClearCodec band data to execute arbitrary code.
User interaction is required to connect to a malicious RDP server, and exploitation depends on realloc failure under memory pressure.
2) Integer overflow (CVE-ID: CVE-2026-33983)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to integer overflow or wraparound in progressive_decompress_tile_upgrade() when processing progressive codec tile data with changed quant values between passes. A remote attacker can send specially crafted progressive codec data to cause a denial of service.
User interaction is required for exploitation.
Remediation
Install update from vendor's website.