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TI-2026-33441 Aliases CVE-2026-45700

Heap-buffer-overflow write in planar bitmap decoder

Priority HIGH 69CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 20 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 3.26.0, FreeRDP's planar bitmap decoder has an out-of-bounds heap write when decoding RLE planar data. In libfreerdp/codec/planar.c, freerdp_bitmap_decompress_planar() validates the X destination coordinate nXDst against the caller-provided destination stride (nDstStep) even when it is writing into the internal temp buffer pTempData. An attacker can bypass the check with a large nDstStep and a large nXDst, causing planar_decompress_plane_rle() to write past the end of pTempData. This vulnerability is fixed in 3.26.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.06102 93rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 3.26.0Red Hat: 11 advisoriesRed Hat: 20 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 3.26.03.26.0Patch availableCNA
  • FreeRDP VendorFreeRDP Affected before 3.26.0 Fixed in 3.26.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 3.26.0VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 3.26.0 Vulnerable ·FreeRDP

Remediation

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.26.0

Red Hat 11 advisories

  • RHSA-2026:47201 Released 2026-07-28 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) freerdp-2.1.1-5.el7_9.10, freerdp-libs-2.1.1-5.el7_9.10, freerdp-libs-2.1.1-5.el7_9.10.ppc +2
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) freerdp-devel-2.1.1-5.el7_9.10, freerdp-devel-2.1.1-5.el7_9.10.ppc, libwinpr-devel-2.1.1-5.el7_9.10 +1
  • RHSA-2026:47049 Released 2026-07-28 · Red Hat rating Important
    freerdp security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) freerdp-devel-2:2.11.7-1.el9_6.11, libwinpr-devel-2:2.11.7-1.el9_6.11
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) freerdp-2:2.11.7-1.el9_6.11, freerdp-libs-2:2.11.7-1.el9_6.11, libwinpr-2:2.11.7-1.el9_6.11
  • RHSA-2026:47048 Released 2026-07-28 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) freerdp-2:2.4.1-6.el9_2.10, freerdp-libs-2:2.4.1-6.el9_2.10, libwinpr-2:2.4.1-6.el9_2.10
Show 8 more Red Hat advisories
  • RHSA-2026:46388 Released 2026-07-27 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) freerdp-2:2.2.0-12.el8_8.9, freerdp-libs-2:2.2.0-12.el8_8.9, libwinpr-2:2.2.0-12.el8_8.9 +1
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) freerdp-2:2.2.0-12.el8_8.9, freerdp-libs-2:2.2.0-12.el8_8.9, libwinpr-2:2.2.0-12.el8_8.9 +1
  • RHSA-2026:46389 Released 2026-07-27 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) freerdp-2:2.2.0-7.el8_6.9, freerdp-libs-2:2.2.0-7.el8_6.9, libwinpr-2:2.2.0-7.el8_6.9 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) freerdp-2:2.2.0-7.el8_6.9, freerdp-libs-2:2.2.0-7.el8_6.9, libwinpr-2:2.2.0-7.el8_6.9 +1
  • RHSA-2026:46384 Released 2026-07-27 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) freerdp-2:2.2.0-14.el8_4.1, freerdp-libs-2:2.2.0-14.el8_4.1, libwinpr-2:2.2.0-14.el8_4.1 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) freerdp-2:2.2.0-14.el8_4.1, freerdp-libs-2:2.2.0-14.el8_4.1, libwinpr-2:2.2.0-14.el8_4.1 +1
  • RHSA-2026:46393 Released 2026-07-27 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp-2:3.10.3-3.el10_0.9, freerdp-libs-2:3.10.3-3.el10_0.9, libwinpr-2:3.10.3-3.el10_0.9
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-devel-2:3.10.3-3.el10_0.9, freerdp-server-2:3.10.3-3.el10_0.9, libwinpr-devel-2:3.10.3-3.el10_0.9
  • RHSA-2026:46383 Released 2026-07-27 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) freerdp-2:2.11.2-1.el9_4.9, freerdp-libs-2:2.11.2-1.el9_4.9, libwinpr-2:2.11.2-1.el9_4.9
  • RHSA-2026:38501 Released 2026-07-13 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 8) freerdp-2:2.11.7-10.el8_10, freerdp-libs-2:2.11.7-10.el8_10, libwinpr-2:2.11.7-10.el8_10 +1
    • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel-2:2.11.7-10.el8_10
  • RHSA-2026:37207 Released 2026-07-09 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.11.7-7.el9_8.4, freerdp-libs-2:2.11.7-7.el9_8.4, libwinpr-2:2.11.7-7.el9_8.4
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel-2:2.11.7-7.el9_8.4, libwinpr-devel-2:2.11.7-7.el9_8.4
  • RHSA-2026:36203 Released 2026-07-07 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 10) freerdp-2:3.10.3-12.el10_2.6, freerdp-libs-2:3.10.3-12.el10_2.6, libwinpr-2:3.10.3-12.el10_2.6
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-devel-2:3.10.3-12.el10_2.6, freerdp-server-2:3.10.3-12.el10_2.6, libwinpr-devel-2:3.10.3-12.el10_2.6

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: Out of support scope
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:47049
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:36203
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:38501
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:37207
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:46384
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:46389
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:46388
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:47048
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:46383
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:46393
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:47049
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:46384
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:46389
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:46388
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:38501
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:36203
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:37207
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:46393
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:47201
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:47201

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45700
  2. 2026-10-25 EPSS moved to the 90th–95th percentile

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