FreeRDP before 3.32.0 contains a double-free vulnerability in nsc_context_initialize_encode() that leaves dangling plane pointers after a partial… (CVE-2026-109257)
Description
FreeRDP versions before 3.32.0 have a double-free vulnerability in the function nsc_context_initialize_encode(). This flaw occurs after a partial buffer growth failure, leaving dangling plane pointers. An attacker using a specially crafted RDP client can negotiate NSCodec with a large desktop geometry to trigger an allocation failure, causing the server to crash during context teardown. The vulnerability has a CVSS score of 5.9 and is classified as high severity due to its potential to cause denial of service.
CVSS v3.1
Score 5.9medium
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in FreeRDP prior to version 3.32.0 is a double-free issue in the nsc_context_initialize_encode() function. It arises when a partial buffer growth failure leaves dangling pointers to planes, which are then freed twice. An attacker can exploit this by negotiating the NSCodec with a large desktop geometry, triggering an allocation failure that leads to a crash of the server during the context teardown phase. This vulnerability does not impact confidentiality or integrity but results in high availability impact (denial of service).
Potential Impact
Successful exploitation causes the FreeRDP server to crash, resulting in denial of service. There is no impact on confidentiality or integrity according to the CVSS vector. The attack requires network access with high attack complexity and no privileges or user interaction.
Mitigation Recommendations
A fix is available in FreeRDP version 3.32.0. Users should upgrade to version 3.32.0 or later to remediate this vulnerability. No other mitigations are specified.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-q56w-xxg8-3cmg
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-109257"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6acd55502cdf04f656da8541
Added to database: 10/12/2026, 21:46:56 UTC
Last enriched: 10/12/2026, 21:56:44 UTC
Last updated: 10/13/2026, 02:48:23 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.