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TI-2026-18344 Aliases CVE-2026-22852

FreeRDP has a heap-buffer-overflow in audin_process_formats

Priority HIGH 65CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
High
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 24 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client when processing Audio Input (AUDIN) format lists. audin_process_formats reuses callback->formats_count across multiple MSG_SNDIN_FORMATS PDUs and writes past the newly allocated formats array, causing memory corruption and a crash. This vulnerability is fixed in 3.20.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00428 37th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 3.20.1Red Hat: 14 advisoriesRed Hat: 24 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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 3.20.13.20.1Patch availableCNA
  • FreeRDP VendorFreeRDP Affected before 3.20.1 Fixed in 3.20.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 3.20.1VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 3.20.1 Vulnerable ·FreeRDP

Remediation

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.20.1

Red Hat 14 advisories

  • RHSA-2026:19033 Released 2026-05-19 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 10) freerdp-2:3.10.3-12.el10_2.2, freerdp-libs-2:3.10.3-12.el10_2.2, libwinpr-2:3.10.3-12.el10_2.2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-devel-2:3.10.3-12.el10_2.2, freerdp-server-2:3.10.3-12.el10_2.2, libwinpr-devel-2:3.10.3-12.el10_2.2
  • RHSA-2026:11323 Released 2026-04-28 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) freerdp-2.1.1-5.el7_9.7, freerdp-libs-2.1.1-5.el7_9.7, freerdp-libs-2.1.1-5.el7_9.7.ppc +2
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) freerdp-devel-2.1.1-5.el7_9.7, freerdp-devel-2.1.1-5.el7_9.7.ppc, libwinpr-devel-2.1.1-5.el7_9.7 +1
  • RHSA-2026:10951 Released 2026-04-27 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) freerdp-2:2.2.0-7.el8_6.5, freerdp-libs-2:2.2.0-7.el8_6.5, libwinpr-2:2.2.0-7.el8_6.5 +1
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) freerdp-2:2.2.0-7.el8_6.5, freerdp-libs-2:2.2.0-7.el8_6.5, libwinpr-2:2.2.0-7.el8_6.5 +1
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) freerdp-2:2.2.0-7.el8_6.5, freerdp-libs-2:2.2.0-7.el8_6.5, libwinpr-2:2.2.0-7.el8_6.5 +1
Show 11 more Red Hat advisories
  • RHSA-2026:10735 Released 2026-04-27 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) freerdp-2:2.2.0-12.el8_4, freerdp-libs-2:2.2.0-12.el8_4, libwinpr-2:2.2.0-12.el8_4 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) freerdp-2:2.2.0-12.el8_4, freerdp-libs-2:2.2.0-12.el8_4, libwinpr-2:2.2.0-12.el8_4 +1
  • RHSA-2026:10734 Released 2026-04-27 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) freerdp-2:2.0.0-46.rc4.el8_2.10, freerdp-libs-2:2.0.0-46.rc4.el8_2.10, libwinpr-2:2.0.0-46.rc4.el8_2.10 +1
  • RHSA-2026:10076 Released 2026-04-23 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) freerdp-2:2.2.0-12.el8_8.5, freerdp-libs-2:2.2.0-12.el8_8.5, libwinpr-2:2.2.0-12.el8_8.5 +1
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) freerdp-2:2.2.0-12.el8_8.5, freerdp-libs-2:2.2.0-12.el8_8.5, libwinpr-2:2.2.0-12.el8_8.5 +1
  • RHSA-2026:9641 Released 2026-04-22 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) freerdp-2:2.4.1-6.el9_2.6, freerdp-libs-2:2.4.1-6.el9_2.6, libwinpr-2:2.4.1-6.el9_2.6
  • RHSA-2026:9640 Released 2026-04-22 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) freerdp-2:2.4.1-3.el9_0.4, freerdp-libs-2:2.4.1-3.el9_0.4, libwinpr-2:2.4.1-3.el9_0.4
  • RHSA-2026:6958 Released 2026-04-08 · Red Hat rating Important
    freerdp security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) freerdp-devel-2:2.11.2-1.el9_4.5, libwinpr-devel-2:2.11.2-1.el9_4.5
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) freerdp-2:2.11.2-1.el9_4.5, freerdp-libs-2:2.11.2-1.el9_4.5, libwinpr-2:2.11.2-1.el9_4.5
  • RHSA-2026:6918 Released 2026-04-07 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 8) freerdp-2:2.11.7-6.el8_10, freerdp-libs-2:2.11.7-6.el8_10, libwinpr-2:2.11.7-6.el8_10 +1
    • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel-2:2.11.7-6.el8_10
  • RHSA-2026:6799 Released 2026-04-07 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 10) freerdp-2:3.10.3-5.el10_1.5, freerdp-libs-2:3.10.3-5.el10_1.5, libwinpr-2:3.10.3-5.el10_1.5
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-devel-2:3.10.3-5.el10_1.5, freerdp-server-2:3.10.3-5.el10_1.5, libwinpr-devel-2:3.10.3-5.el10_1.5
  • RHSA-2026:6743 Released 2026-04-07 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp-2:3.10.3-3.el10_0.5, freerdp-libs-2:3.10.3-3.el10_0.5, libwinpr-2:3.10.3-3.el10_0.5
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-devel-2:3.10.3-3.el10_0.5, freerdp-server-2:3.10.3-3.el10_0.5, libwinpr-devel-2:3.10.3-3.el10_0.5
  • RHSA-2026:6727 Released 2026-04-07 · Red Hat rating Important
    freerdp security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) freerdp-devel-2:2.11.7-1.el9_6.7, libwinpr-devel-2:2.11.7-1.el9_6.7
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) freerdp-2:2.11.7-1.el9_6.7, freerdp-libs-2:2.11.7-1.el9_6.7, libwinpr-2:2.11.7-1.el9_6.7
  • RHSA-2026:6340 Released 2026-04-01 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.11.7-1.el9_7.5, freerdp-libs-2:2.11.7-1.el9_7.5, libwinpr-2:2.11.7-1.el9_7.5
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel-2:2.11.7-1.el9_7.5, libwinpr-devel-2:2.11.7-1.el9_7.5

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: Will not fix
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:6958
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:6727
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:19033, RHSA-2026:6799
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:6918
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:6340
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2026:10734
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:10735
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:10951
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2026:10951
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:10076
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:9640
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:9641
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:6743
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:6958
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:6727
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:10735
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2026:10951
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:10076
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:6918
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:19033, RHSA-2026:6799
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:6340
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:6743
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:11323
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:11323

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-22852

References

Exploit 1

Other 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