cve.bz

CVE-2026-125394 FreeRDP before 3.33.0 Use-After-Free via Stale Brush Cache Pointer

5.3 mediumEPSS 0.2%

Medium (5.3) in freerdp freerdp. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.

On this page
FreeRDP before 3.33.0 contains a heap use-after-free vulnerability in update_gdi_patblt(), update_gdi_polygon_cb() and update_gdi_mem3blt() that retain stale brush cache pointers. A malicious RDP server can resend CACHE_BRUSH to the same slot then send PATBLT, causing clients to read freed heap memory, disclosing data or crashing.

Severity

CVSS 4.0

5.3 medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS 3.1

5.4 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
EPSS
0.2% estimated probability of exploitation activity in the next 30 days; 12th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: PoC · Automatable: no · Technical impact: partial, assessed 2026-11-13. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE
CWE-416 Use After Free
Published
Modified
Assigned by
VulnCheck (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

Ask an AI about this CVE

ChatGPTClaudeGoogle AI Mode

Show the promptExplain CVE-2026-125394 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-125394?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-125394?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-125394 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.

Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.

Badge for a README or a site

CVE-2026-125394

An image that stays current: it is drawn from the data each time it is fetched (a host that proxies images, as GitHub does, may show its copy for a while). Markdown:

[![CVE-2026-125394](https://cve.bz/cve/badge/CVE-2026-125394.svg)](https://cve.bz/cve/CVE-2026-125394)

HTML:

<a href="https://cve.bz/cve/CVE-2026-125394"><img src="https://cve.bz/cve/badge/CVE-2026-125394.svg" alt="CVE-2026-125394"></a>

Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
FreeRDPbefore 3.33.0

Linux distributions

DistributionReleasePackageFixed inAdvisory
Debian12freerdp2no fix listedDEBIAN-CVE-2026-125394
Debian13, 14freerdp3no fix listedDEBIAN-CVE-2026-125394
Ubuntu16.04:LTS, 18.04:LTSfreerdpno fix listedUBUNTU-CVE-2026-125394

From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu.

GitHub PoC (unverified)

Repositories on GitHub named after this CVE. Nobody has checked them and they are not scanned: some hold a working proof of concept, some nothing useful, and some malware made to look like one. Read the code before you run any of it.

  • D7EAD/CVE-2026-125394 1 star, created
    FreeRDP before 3.33.0 contains a heap UAF vulnerability in update_gdi_patblt(), update_gdi_polygon_cb() and update_gdi_mem3blt() that retai…

References

Check your stackJSON