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TI-2026-18347 Aliases CVE-2026-22855

FreeRDP has a heap-buffer-overflow in smartcard_unpack_set_attrib_call

Priority MEDIUM 58CWE-125Published · Updated

Key facts

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

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

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a heap out-of-bounds read occurs in the smartcard SetAttrib path when cbAttrLen does not match the actual NDR buffer length. This vulnerability is fixed in 3.20.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00888 59th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 3.20.1Red Hat: 13 advisoriesRed Hat: 23 fixed, 1 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 3.20.13.20.1Patch 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 13 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-2026:4489 Released 2026-03-12 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) freerdp-2:2.4.1-3.el9_0.1, freerdp-libs-2:2.4.1-3.el9_0.1, libwinpr-2:2.4.1-3.el9_0.1
  • RHSA-2026:4471 Released 2026-03-12 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) freerdp-2.1.1-5.el7_9.2, freerdp-libs-2.1.1-5.el7_9.2, freerdp-libs-2.1.1-5.el7_9.2.ppc +2
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) freerdp-devel-2.1.1-5.el7_9.2, freerdp-devel-2.1.1-5.el7_9.2.ppc, libwinpr-devel-2.1.1-5.el7_9.2 +1
Show 10 more Red Hat advisories
  • RHSA-2026:4446 Released 2026-03-12 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) freerdp-2:2.2.0-7.el8_6.2, freerdp-libs-2:2.2.0-7.el8_6.2, libwinpr-2:2.2.0-7.el8_6.2 +1
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) freerdp-2:2.2.0-7.el8_6.2, freerdp-libs-2:2.2.0-7.el8_6.2, libwinpr-2:2.2.0-7.el8_6.2 +1
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) freerdp-2:2.2.0-7.el8_6.2, freerdp-libs-2:2.2.0-7.el8_6.2, libwinpr-2:2.2.0-7.el8_6.2 +1
  • RHSA-2026:4440 Released 2026-03-12 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) freerdp-2:2.2.0-12.el8_8.2, freerdp-libs-2:2.2.0-12.el8_8.2, libwinpr-2:2.2.0-12.el8_8.2 +1
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) freerdp-2:2.2.0-12.el8_8.2, freerdp-libs-2:2.2.0-12.el8_8.2, libwinpr-2:2.2.0-12.el8_8.2 +1
  • RHSA-2026:4438 Released 2026-03-12 · Red Hat rating Important
    freerdp security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) freerdp-devel-2:2.11.2-1.el9_4.2, libwinpr-devel-2:2.11.2-1.el9_4.2
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) freerdp-2:2.11.2-1.el9_4.2, freerdp-libs-2:2.11.2-1.el9_4.2, libwinpr-2:2.11.2-1.el9_4.2
  • RHSA-2026:4439 Released 2026-03-12 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) freerdp-2:2.2.0-8.el8_4, freerdp-libs-2:2.2.0-8.el8_4, libwinpr-2:2.2.0-8.el8_4 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) freerdp-2:2.2.0-8.el8_4, freerdp-libs-2:2.2.0-8.el8_4, libwinpr-2:2.2.0-8.el8_4 +1
  • RHSA-2026:4437 Released 2026-03-12 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) freerdp-2:2.4.1-6.el9_2.3, freerdp-libs-2:2.4.1-6.el9_2.3, libwinpr-2:2.4.1-6.el9_2.3
  • RHSA-2026:4121 Released 2026-03-09 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp-2:3.10.3-3.el10_0.2, freerdp-libs-2:3.10.3-3.el10_0.2, libwinpr-2:3.10.3-3.el10_0.2
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-devel-2:3.10.3-3.el10_0.2, freerdp-server-2:3.10.3-3.el10_0.2, libwinpr-devel-2:3.10.3-3.el10_0.2
  • RHSA-2026:3975 Released 2026-03-09 · Red Hat rating Important
    freerdp security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) freerdp-devel-2:2.11.7-1.el9_6.2, libwinpr-devel-2:2.11.7-1.el9_6.2
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) freerdp-2:2.11.7-1.el9_6.2, freerdp-libs-2:2.11.7-1.el9_6.2, libwinpr-2:2.11.7-1.el9_6.2
  • RHSA-2026:3334 Released 2026-02-25 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 8) freerdp-2:2.11.7-3.el8_10, freerdp-libs-2:2.11.7-3.el8_10, libwinpr-2:2.11.7-3.el8_10 +1
    • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel-2:2.11.7-3.el8_10
  • RHSA-2026:3067 Released 2026-02-23 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.11.7-1.el9_7.2, freerdp-libs-2:2.11.7-1.el9_7.2, libwinpr-2:2.11.7-1.el9_7.2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel-2:2.11.7-1.el9_7.2, libwinpr-devel-2:2.11.7-1.el9_7.2
  • RHSA-2026:3068 Released 2026-02-23 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 10) freerdp-2:3.10.3-5.el10_1.2, freerdp-libs-2:3.10.3-5.el10_1.2, libwinpr-2:3.10.3-5.el10_1.2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-devel-2:3.10.3-5.el10_1.2, freerdp-server-2:3.10.3-5.el10_1.2, libwinpr-devel-2:3.10.3-5.el10_1.2

Vendor assessments

Red Hat

Red Hat rating: Important. 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-2026:4438
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:3975
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:19033, RHSA-2026:3068
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:3334
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:3067
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:4439
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:4446
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2026:4446
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:4440
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:4489
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:4437
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:4121
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:4438
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:3975
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:4439
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2026:4446
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:4440
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:3334
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:19033, RHSA-2026:3068
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:3067
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:4121
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:4471
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:4471

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-22855

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