Read the docs
TI-2026-26326 Aliases CVE-2026-33985

FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read

Priority LOW 31CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · Low
Fix status
Partial Red Hat: 23 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, pixel data from adjacent heap memory is rendered to screen, potentially leaking sensitive data to the attacker. This issue has been patched in version 3.24.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00213 11th percentileScored 2026-11-07
Fix Partial FreeRDP (FreeRDP): 3.24.2Red Hat: 14 advisoriesRed Hat: 23 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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 3.24.23.24.2Patch availableCNA
  • FreeRDP VendorFreeRDP Affected before 3.24.2 Fixed in 3.24.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 3.24.2VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 3.24.2 Vulnerable ·FreeRDP

Remediation

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.24.2

Red Hat 14 advisories

  • RHSA-2026:20605 Released 2026-05-26 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp-2:3.10.3-3.el10_0.7, freerdp-libs-2:3.10.3-3.el10_0.7, libwinpr-2:3.10.3-3.el10_0.7
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-devel-2:3.10.3-3.el10_0.7, freerdp-server-2:3.10.3-3.el10_0.7, libwinpr-devel-2:3.10.3-3.el10_0.7
  • RHSA-2026:20546 Released 2026-05-26 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) freerdp-2.1.1-5.el7_9.9, freerdp-libs-2.1.1-5.el7_9.9, freerdp-libs-2.1.1-5.el7_9.9.ppc +2
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) freerdp-devel-2.1.1-5.el7_9.9, freerdp-devel-2.1.1-5.el7_9.9.ppc, libwinpr-devel-2.1.1-5.el7_9.9 +1
  • RHSA-2026:19811 Released 2026-05-20 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) freerdp-2:2.2.0-14.el8_4, freerdp-libs-2:2.2.0-14.el8_4, libwinpr-2:2.2.0-14.el8_4 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) freerdp-2:2.2.0-14.el8_4, freerdp-libs-2:2.2.0-14.el8_4, libwinpr-2:2.2.0-14.el8_4 +1
Show 11 more Red Hat advisories
  • RHSA-2026:19358 Released 2026-05-19 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.11.7-7.el9_8.3, freerdp-libs-2:2.11.7-7.el9_8.3, libwinpr-2:2.11.7-7.el9_8.3
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel-2:2.11.7-7.el9_8.3, libwinpr-devel-2:2.11.7-7.el9_8.3
  • RHSA-2026:19142 Released 2026-05-19 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 10) freerdp-2:3.10.3-12.el10_2.5, freerdp-libs-2:3.10.3-12.el10_2.5, libwinpr-2:3.10.3-12.el10_2.5
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-devel-2:3.10.3-12.el10_2.5, freerdp-server-2:3.10.3-12.el10_2.5, libwinpr-devel-2:3.10.3-12.el10_2.5
  • RHSA-2026:16865 Released 2026-05-13 · Red Hat rating Moderate
    freerdp security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) freerdp-devel-2:2.11.7-1.el9_6.10, libwinpr-devel-2:2.11.7-1.el9_6.10
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) freerdp-2:2.11.7-1.el9_6.10, freerdp-libs-2:2.11.7-1.el9_6.10, libwinpr-2:2.11.7-1.el9_6.10
  • RHSA-2026:16866 Released 2026-05-13 · Red Hat rating Moderate
    freerdp security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) freerdp-devel-2:2.11.2-1.el9_4.8, libwinpr-devel-2:2.11.2-1.el9_4.8
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) freerdp-2:2.11.2-1.el9_4.8, freerdp-libs-2:2.11.2-1.el9_4.8, libwinpr-2:2.11.2-1.el9_4.8
  • RHSA-2026:16814 Released 2026-05-13 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) freerdp-2:2.2.0-7.el8_6.8, freerdp-libs-2:2.2.0-7.el8_6.8, libwinpr-2:2.2.0-7.el8_6.8 +1
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) freerdp-2:2.2.0-7.el8_6.8, freerdp-libs-2:2.2.0-7.el8_6.8, libwinpr-2:2.2.0-7.el8_6.8 +1
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) freerdp-2:2.2.0-7.el8_6.8, freerdp-libs-2:2.2.0-7.el8_6.8, libwinpr-2:2.2.0-7.el8_6.8 +1
  • RHSA-2026:16777 Released 2026-05-13 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) freerdp-2:2.2.0-12.el8_8.8, freerdp-libs-2:2.2.0-12.el8_8.8, libwinpr-2:2.2.0-12.el8_8.8 +1
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) freerdp-2:2.2.0-12.el8_8.8, freerdp-libs-2:2.2.0-12.el8_8.8, libwinpr-2:2.2.0-12.el8_8.8 +1
  • RHSA-2026:16482 Released 2026-05-13 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.11.7-1.el9_7.7, freerdp-libs-2:2.11.7-1.el9_7.7, libwinpr-2:2.11.7-1.el9_7.7
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel-2:2.11.7-1.el9_7.7, libwinpr-devel-2:2.11.7-1.el9_7.7
  • RHSA-2026:16483 Released 2026-05-12 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) freerdp-2:2.4.1-6.el9_2.9, freerdp-libs-2:2.4.1-6.el9_2.9, libwinpr-2:2.4.1-6.el9_2.9
  • RHSA-2026:16485 Released 2026-05-12 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) freerdp-2:2.4.1-3.el9_0.7, freerdp-libs-2:2.4.1-3.el9_0.7, libwinpr-2:2.4.1-3.el9_0.7
  • RHSA-2026:16019 Released 2026-05-11 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 8) freerdp-2:2.11.7-9.el8_10, freerdp-libs-2:2.11.7-9.el8_10, libwinpr-2:2.11.7-9.el8_10 +1
    • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel-2:2.11.7-9.el8_10
  • RHSA-2026:16014 Released 2026-05-11 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 10) freerdp-2:3.10.3-5.el10_1.8, freerdp-libs-2:3.10.3-5.el10_1.8, libwinpr-2:3.10.3-5.el10_1.8
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-devel-2:3.10.3-5.el10_1.8, freerdp-server-2:3.10.3-5.el10_1.8, libwinpr-devel-2:3.10.3-5.el10_1.8

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.9.4)Fixed RHSA-2026:16866
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:16865
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:16014, RHSA-2026:19142
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:16019
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:16482, RHSA-2026:19358
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:19811
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:16814
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2026:16814
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:16777
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:16485
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:16483
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:20605
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:16866
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:16865
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:19811
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2026:16814
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:16777
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:16019
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:16014, RHSA-2026:19142
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:16482, RHSA-2026:19358
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:20605
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:20546
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:20546

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33985

References

Patch 2

  • 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