CVE-2026-33983
FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS
- State
- Published
- Severity
- 6.5 Medium
- Published
- Mar 30, 2026
- Updated
- Jul 15, 2026
- Reserved
- Mar 24, 2026
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressive_decompress_tile_upgrade() detects a mismatch via progressive_rfx_quant_cmp_equal() but only emits WLog_WARN, execution continues. The wrapped value (247) is used as a shift exponent, causing undefined behavior and an approximately 80 billion iteration loop (CPU DoS). This issue has been patched in version 3.24.2.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
FreeRDPFreeRDP |
|
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gfm-4p52-h478
- https://github.com/FreeRDP/FreeRDP/commit/78188ab479c8e6eb9ba2475b3732c76b4bbe5425
- https://access.redhat.com/security/cve/CVE-2026-33983vdb-entry
- RHBZ#2453220issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33983.json
- https://access.redhat.com/errata/RHSA-2026:11333vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8458vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19033vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8945vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:11651vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:11649vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:12388vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:12359vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:11332vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:11336vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:10709vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:9656vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8457vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19349vendor-advisory
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