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TI-2026-47595 Aliases CVE-2026-67299GHSA-jq8c-588g-4wgj

FreeRDP before 3.29.0 Use-After-Free via WindowIcon async message

Priority HIGH 77CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 20 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async update message proxy for WINDOW_ICON_ORDER when AsyncUpdate is enabled (e.g. xfreerdp /async-update). In update_message_WindowIcon() a shallow CopyMemory() overwrites a freshly allocated lParam->iconInfo with the parser-owned windowIcon->iconInfo pointer. After the parser callback returns, update_recv_window_info_order() frees window_icon.iconInfo, but the queued async message still retains and later dispatches that stale pointer. A malicious or compromised RDP server sending a crafted RAIL Window Alternate Secondary Order with WINDOW_ORDER_ICON can trigger use-after-free, leading to memory corruption and client crash.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00398 34th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 3.29.0Red Hat: 11 advisoriesRed Hat: 20 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeRDPFreeRDPbefore 3.29.03.29.0Patch availableCNA
  • FreeRDP VendorFreeRDP Affected before 3.29.0 Fixed in 3.29.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 3.29.0VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 3.29.0 Vulnerable ·FreeRDP

Remediation

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.29.0

Red Hat 11 advisories

  • RHSA-2026:62401 Released 2026-09-02 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) freerdp-2.1.1-5.el7_9.11, freerdp-libs-2.1.1-5.el7_9.11, freerdp-libs-2.1.1-5.el7_9.11.ppc +2
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) freerdp-devel-2.1.1-5.el7_9.11, freerdp-devel-2.1.1-5.el7_9.11.ppc, libwinpr-devel-2.1.1-5.el7_9.11 +1
  • RHSA-2026:61251 Released 2026-08-31 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) freerdp-2:2.2.0-12.el8_8.10, freerdp-libs-2:2.2.0-12.el8_8.10, libwinpr-2:2.2.0-12.el8_8.10 +1
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) freerdp-2:2.2.0-12.el8_8.10, freerdp-libs-2:2.2.0-12.el8_8.10, libwinpr-2:2.2.0-12.el8_8.10 +1
  • RHSA-2026:61250 Released 2026-08-31 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) freerdp-2:2.2.0-7.el8_6.11, freerdp-libs-2:2.2.0-7.el8_6.11, libwinpr-2:2.2.0-7.el8_6.11 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) freerdp-2:2.2.0-7.el8_6.11, freerdp-libs-2:2.2.0-7.el8_6.11, libwinpr-2:2.2.0-7.el8_6.11 +1
Show 8 more Red Hat advisories
  • RHSA-2026:60173 Released 2026-08-26 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) freerdp-2:2.2.0-14.el8_4.2, freerdp-libs-2:2.2.0-14.el8_4.2, libwinpr-2:2.2.0-14.el8_4.2 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) freerdp-2:2.2.0-14.el8_4.2, freerdp-libs-2:2.2.0-14.el8_4.2, libwinpr-2:2.2.0-14.el8_4.2 +1
  • RHSA-2026:58713 Released 2026-08-24 · Red Hat rating Important
    freerdp security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) freerdp-devel-2:2.11.7-1.el9_6.12, libwinpr-devel-2:2.11.7-1.el9_6.12
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) freerdp-2:2.11.7-1.el9_6.12, freerdp-libs-2:2.11.7-1.el9_6.12, libwinpr-2:2.11.7-1.el9_6.12
  • RHSA-2026:58710 Released 2026-08-24 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) freerdp-2:2.11.2-1.el9_4.10, freerdp-libs-2:2.11.2-1.el9_4.10, libwinpr-2:2.11.2-1.el9_4.10
  • RHSA-2026:58712 Released 2026-08-24 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) freerdp-2:2.4.1-6.el9_2.11, freerdp-libs-2:2.4.1-6.el9_2.11, libwinpr-2:2.4.1-6.el9_2.11
  • RHSA-2026:58711 Released 2026-08-24 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp-2:3.10.3-3.el10_0.11, freerdp-libs-2:3.10.3-3.el10_0.11, libwinpr-2:3.10.3-3.el10_0.11
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-devel-2:3.10.3-3.el10_0.11, freerdp-server-2:3.10.3-3.el10_0.11, libwinpr-devel-2:3.10.3-3.el10_0.11
  • RHSA-2026:54487 Released 2026-08-13 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.11.7-7.el9_8.5, freerdp-libs-2:2.11.7-7.el9_8.5, libwinpr-2:2.11.7-7.el9_8.5
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel-2:2.11.7-7.el9_8.5, libwinpr-devel-2:2.11.7-7.el9_8.5
  • RHSA-2026:54485 Released 2026-08-13 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 8) freerdp-2:2.11.7-11.el8_10, freerdp-libs-2:2.11.7-11.el8_10, libwinpr-2:2.11.7-11.el8_10 +1
    • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel-2:2.11.7-11.el8_10
  • RHSA-2026:54486 Released 2026-08-13 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 10) freerdp-2:3.10.3-12.el10_2.8, freerdp-libs-2:3.10.3-12.el10_2.8, libwinpr-2:3.10.3-12.el10_2.8
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-devel-2:3.10.3-12.el10_2.8, freerdp-server-2:3.10.3-12.el10_2.8, libwinpr-devel-2:3.10.3-12.el10_2.8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    FreeRDP 3.29.0

    21 records Highest priority Priority HIGH 11 HIGH, 9 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-47600 FreeRDP before 3.29.0 NULL Dereference via smartcard cleanupPriority HIGH 77
    • TI-2026-47597 FreeRDP before 3.29.0 Out-of-bounds Read via Polygon async message-proxyPriority HIGH 77
    • TI-2026-47594 FreeRDP 3.28.0 Heap Buffer Overflow via RAIL orderLength UnderflowPriority HIGH 77
    Show all 21 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:58713
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:54486
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:54485
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:54487
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:60173
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:61250
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:61251
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:58712
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:58710
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:58711
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:58713
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:60173
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:61250
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:61251
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:54485
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:54486
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:54487
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:58711
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:62401
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:62401

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-67299
  2. 2026-10-03 Alias added: GHSA-jq8c-588g-4wgj

References

Exploit 1

Patch 1

  • TI-2026-85092 Use-after-free in FreeRDP rdpgfx channel close handling CVSS 4.0CRITICAL 9.3
  • TI-2026-85091 Out-of-bounds write in FreeRDP proxy via bitmap cache v2 capability CVSS 4.0CRITICAL 9.3
  • TI-2026-24435 FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write CVSS 3.1CRITICAL 9.8
  • TI-2023-21373 Out-Of-Bounds Write in FreeRDP CVSS 3.1CRITICAL 9.8
  • TI-2022-08692 Server side NTLM does not properly check parameters in FreeRDP CVSS 3.1CRITICAL 9.1
  • TI-2023-21374 Out-Of-Bounds Read in FreeRDP CVSS 3.1CRITICAL 9.1
See all 336 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences