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TI-2026-84279 Aliases CVE-2026-121397GHSA-4v6v-rqm8-m7cj

Heap over-read in FreeRDP clipboard PNG conversion leaks client memory

Priority MEDIUM 57CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Partial Red Hat: 5 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.

Summary

FreeRDP before 3.32.2 contains a heap buffer over-read in save_png_to_buffer() (CWE-125). A malicious RDP server can send 16 bpp DIB clipboard data that, when converted to PNG for a local application, embeds client heap bytes into the clipboard image.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

FreeRDP before 3.32.2 contains a heap buffer over-read vulnerability in save_png_to_buffer() that allows malicious RDP servers to leak client memory by sending 16 bpp DIB clipboard data. Attackers can offer a CF_DIB BI_BITFIELDS image that, when converted to PNG for a local application, embeds client heap bytes into the clipboard image.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0027 19th percentileScored 2026-11-07
Fix Partial FreeRDP (FreeRDP): 3.32.2Red Hat: 5 without a fix

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
FreeRDPFreeRDPbefore 3.32.23.32.2Patch availableCNA
  • FreeRDP VendorFreeRDP Affected before 3.32.2 Fixed in 3.32.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 3.32.2VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 3.32.2 Vulnerable ·FreeRDP

Remediation

Update FreeRDP to version 3.32.2 or later. Red Hat's plan for Red Hat Enterprise Linux 7, 8, 9 and 10 is none available, and for Red Hat Enterprise Linux 6 it is no fix planned.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.32.2

Fixed in the same release

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

  • Release ·

    FreeRDP 3.32.2

    27 records Highest priority Priority HIGH 3 HIGH, 11 MEDIUM, 13 LOW

    Other records, highest priority first

    • TI-2026-84268 Denial of service in FreeRDP WinPR PNG and JPEG image readersPriority HIGH 77
    • TI-2026-84291 Denial of service in FreeRDP via oversized X.224 routing tokenPriority HIGH 69
    • TI-2026-84280 Use-after-free in FreeRDP dyn-channel-dump modulePriority HIGH 69
    Show all 27 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-121397
  2. 2026-11-03 CISA SSVC decision points changed
  3. 2026-11-03 Priority changed: LOW → MEDIUM
  4. 2026-11-03 Alias added: GHSA-4v6v-rqm8-m7cj
  5. 2026-11-04 Affected versions changed · Red Hat
  6. 2026-11-04 CVSS score added · Red Hat

References

Advisory 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