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TI-2026-74529 Aliases CVE-2026-110839

Heap out-of-bounds write in FreeRDP JPEG clipboard conversion

Priority MEDIUM 64CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

FreeRDP from 3.3.0 before 3.32.0 built with WINPR_UTILS_IMAGE_JPEG=ON has a heap out-of-bounds write (CWE-787) in winpr_convert_from_jpeg. Grayscale JPEG buffers are sized from one component instead of three BGR components. A malicious RDP server can send a grayscale JPEG through clipboard redirection, corrupting client memory and crashing the client when the item is pasted as CF_DIB bitmap data. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

FreeRDP 3.3.0 before 3.32.0, when built with WINPR_UTILS_IMAGE_JPEG=ON, has a heap-based out-of-bounds write in winpr_convert_from_jpeg because grayscale JPEG buffers are sized from one input component rather than three BGR output components. A malicious RDP server can offer a grayscale JPEG via clipboard redirection, corrupting client memory and crashing it when the item is pasted as CF_DIB bitmap data.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00272 19th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed FreeRDP (FreeRDP): 3.32.0Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
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
FreeRDPFreeRDP3.3.0 to before 3.32.03.32.0Patch availableCNA
  • FreeRDP VendorFreeRDP Affected 3.3.0 to before 3.32.0 Fixed in 3.32.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*3.3.0 to before 3.32.0VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions 3.3.0 to before 3.32.0 Vulnerable ·FreeRDP

Remediation

Update to FreeRDP 3.32.0 or later. Red Hat fixes it in RHSA-2026:94514 for Red Hat Enterprise Linux AppStream (v. 10) and CodeReady Linux Builder (v. 10).

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.32.0

Red Hat 1 advisory

  • RHSA-2026:94514 Released 2026-11-03 · Red Hat rating Important
    freerdp security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) freerdp-2:3.32.2-1.el10_2, freerdp-libs-2:3.32.2-1.el10_2, libwinpr-2:3.32.2-1.el10_2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-devel-2:3.32.2-1.el10_2, freerdp-server-2:3.32.2-1.el10_2, libwinpr-devel-2:3.32.2-1.el10_2

Fixed in the same release

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

  • Release ·

    FreeRDP 3.32.0

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

    Other records, highest priority first

    • TI-2026-74520 FreeRDP serial device handling exhausts file descriptorsPriority HIGH 69
    • TI-2026-74526 FreeRDP Infinite Loop DoS via Gateway Content-TypePriority MEDIUM 64
    • TI-2026-74524 FreeRDP null pointer dereference lets malicious servers crash clientsPriority MEDIUM 64
    Show all 11 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:94514
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:94514
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-110839
  2. 2026-10-15 CISA SSVC decision points changed
  3. 2026-10-16 Affected versions changed · Red Hat
  4. 2026-10-16 CVSS score added · Red Hat
  5. 2026-11-03 Fix available: RHSA-2026:94514 · Red Hat
  6. 2026-11-03 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · Red Hat

References

Exploit 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