CVE-2026-114043 FreeRDP CVE debrief

Who should care

Defenders and administrators using FreeRDP should assess exposure and prioritize patching to version 3.32.1 or later to prevent potential disclosure of heap memory. This includes reviewing FreeRDP versions in use, monitoring for suspicious RDP activity, and verifying clipboard payload handling. Security teams and vulnerability management teams should also review the vulnerability details and plan for remediation.

Why it matters

CVE-2026-114043 is a heap-based out-of-bounds read vulnerability in FreeRDP before 3.32.1. Defenders and administrators using FreeRDP should assess exposure and prioritize patching to version 3.32.1 or later to prevent potential disclosure of heap memory.

• Potential disclosure of heap memory
• Requires verification of FreeRDP version and exposure
• Patching priority for FreeRDP users
• Monitoring for suspicious RDP activity recommended

Technical summary

FreeRDP before 3.32.1 contains a heap-based out-of-bounds read in WinPR's clipboard PNG-to-CF_DIB synthesis because winpr_read_png_from_buffer() allocates a bit-packed buffer for PNGs with bit depth below 8, while winpr_bitmap_write_buffer() copies rows assuming one byte per pixel. A malicious RDP server can send a crafted low-bit-depth PNG clipboard payload that discloses megabytes of heap memory when pasted by the victim. This vulnerability can be mitigated by patching to version 3.32.1 or later. FreeRDP users should assess their exposure and prioritize patching.

Defensive priority

Assess exposure and prioritize patching for FreeRDP users

Recommended defensive actions

• Assess exposure by checking FreeRDP versions in use
• Prioritize patching to version 3.32.1 or later
• Monitor for suspicious RDP activity
• Verify clipboard payload handling
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on a heap-based out-of-bounds read vulnerability in FreeRDP before 3.32.1. A malicious RDP server can send a crafted low-bit-depth PNG clipboard payload that discloses megabytes of heap memory when pasted by the victim. The vulnerability is specifically located in WinPR's clipboard PNG-to-CF_DIB synthesis. FreeRDP users should verify their version and exposure, and patch to version 3.32.1 or later. The CVE record was published on 2026-10-21T01:17:26.660Z and has not been modified since then

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.