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Fencer Vulns
high 7.5

CVE-2026-67291 json

FreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD

published 2026-08-01 3 mo ago modified 2026-09-03 2 mo ago also EUVD-2026-51823

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains a heap out-of-bounds read in update_process_glyph_fragments()/glyph_cache_fragment_put() in libfreerdp/cache/glyph.c. When handling a GLYPH_FRAGMENT_ADD update, the code reads a one-byte server-controlled declared fragment size but does not verify it fits within the remaining received buffer before allocating and copying that many bytes. A malicious RDP server can send a short fragment with an oversized declared size, causing the client to read beyond the allocated buffer, resulting in an out-of-bounds read and client crash.

Patch / fix

  • FreeRDP FreeRDP 3.29.0
  • freerdp3 Debian 14 3.29.0+dfsg-1

debian advisories DEBIAN-CVE-2026-67291

  • freerdp3 Ubuntu 24.04 LTS 3.30.0+dfsg-0ubuntu0.24.04.1
  • freerdp3 Ubuntu 26.04 LTS 3.30.0+dfsg-0ubuntu0.26.04.1

ubuntu advisories UBUNTU-CVE-2026-67291

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • freerdp RHEL 8 2:2.11.7-12.el8_10
  • libwinpr RHEL 8 2:2.11.7-12.el8_10
  • freerdp-libs RHEL 8 2:2.11.7-12.el8_10
  • freerdp RHEL 9 2:2.11.7-7.el9_8.6
  • libwinpr RHEL 9 2:2.11.7-7.el9_8.6
  • freerdp-libs RHEL 9 2:2.11.7-7.el9_8.6
  • freerdp RHEL 10.2 2:3.10.3-12.el10_2.10
  • libwinpr RHEL 10.2 2:3.10.3-12.el10_2.10

red hat advisories RHSA-2026:71390RHSA-2026:71388RHSA-2026:71387RHSA-2026:68706RHSA-2026:68707RHSA-2026:66281

  • freerdp AlmaLinux 8 2:2.11.7-12.el8_10
  • libwinpr AlmaLinux 8 2:2.11.7-12.el8_10
  • freerdp-libs AlmaLinux 8 2:2.11.7-12.el8_10
  • freerdp AlmaLinux 10 2:3.10.3-12.el10_2.10
  • libwinpr AlmaLinux 10 2:3.10.3-12.el10_2.10
  • freerdp-libs AlmaLinux 10 2:3.10.3-12.el10_2.10
  • freerdp-server AlmaLinux 10 2:3.10.3-12.el10_2.10
  • freerdp AlmaLinux 9 2:2.11.7-7.el9_8.6

almalinux advisories ALSA-2026:62571ALSA-2026:61378ALSA-2026:61379

  • freerdp Rocky Linux 8 2:2.11.7-12.el8_10
  • freerdp Rocky Linux 10 2:3.10.3-12.el10_2.10
  • freerdp Rocky Linux 9 2:2.11.7-7.el9_8.6

rocky linux advisories RLSA-2026:62571RLSA-2026:61378RLSA-2026:61379

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-67291 updated cvss 6.5

FreeRDP: FreeRDP: Denial of Service via heap out-of-bounds read

  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder EUS (v.9.6) freerdp-devel 2.11.7-1.el9_6.13, libwinpr-devel 2.11.7-1.el9_6.13, freerdp-debuginfo 2.11.7-1.el9_6.13, libwinpr-debuginfo 2.11.7-1.el9_6.13, freerdp-debugsource 2.11.7-1.el9_6.13, freerdp-libs-debuginfo 2.11.7-1.el9_6.13
    fixed: vendor fix RHSA-2026:71387
  • Red Hat Enterprise Linux AppStream (v. 8) freerdp 2.11.7-12.el8_10, libwinpr 2.11.7-12.el8_10, freerdp-libs 2.11.7-12.el8_10
    fixed: vendor fix RHSA-2026:62571
  • Red Hat Enterprise Linux AppStream (v. 9) freerdp 2.11.7-7.el9_8.6, libwinpr 2.11.7-7.el9_8.6, freerdp-libs 2.11.7-7.el9_8.6
    fixed: vendor fix RHSA-2026:61379
  • Red Hat Enterprise Linux AppStream (v. 10) freerdp 3.10.3-12.el10_2.10, libwinpr 3.10.3-12.el10_2.10, freerdp-libs 3.10.3-12.el10_2.10
    fixed: vendor fix RHSA-2026:61378
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) freerdp 2.2.0-14.el8_4.3, libwinpr 2.2.0-14.el8_4.3, freerdp-libs 2.2.0-14.el8_4.3
    fixed: vendor fix RHSA-2026:65855
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) freerdp 2.2.0-7.el8_6.12, libwinpr 2.2.0-7.el8_6.12, freerdp-libs 2.2.0-7.el8_6.12
    fixed: vendor fix RHSA-2026:66281
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) freerdp 2.2.0-12.el8_8.11, libwinpr 2.2.0-12.el8_8.11, freerdp-libs 2.2.0-12.el8_8.11
    fixed: vendor fix RHSA-2026:66282
show 12 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) freerdp 2.4.1-6.el9_2.12, libwinpr 2.4.1-6.el9_2.12, freerdp-libs 2.4.1-6.el9_2.12
    fixed: vendor fix RHSA-2026:71388
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) freerdp 2.11.2-1.el9_4.11, libwinpr 2.11.2-1.el9_4.11, freerdp-libs 2.11.2-1.el9_4.11
    fixed: vendor fix RHSA-2026:71390
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp 3.10.3-3.el10_0.16, libwinpr 3.10.3-3.el10_0.16, freerdp-libs 3.10.3-3.el10_0.16
    fixed: vendor fix RHSA-2026:68706
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) freerdp 2.11.7-1.el9_6.13, libwinpr 2.11.7-1.el9_6.13, freerdp-libs 2.11.7-1.el9_6.13
    fixed: vendor fix RHSA-2026:71387
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) freerdp 2.2.0-14.el8_4.3, libwinpr 2.2.0-14.el8_4.3, freerdp-libs 2.2.0-14.el8_4.3
    fixed: vendor fix RHSA-2026:65855
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) freerdp 2.2.0-7.el8_6.12, libwinpr 2.2.0-7.el8_6.12, freerdp-libs 2.2.0-7.el8_6.12
    fixed: vendor fix RHSA-2026:66281
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) freerdp 2.2.0-12.el8_8.11, libwinpr 2.2.0-12.el8_8.11, freerdp-libs 2.2.0-12.el8_8.11
    fixed: vendor fix RHSA-2026:66282
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel 2.11.7-7.el9_8.6, libwinpr-devel 2.11.7-7.el9_8.6, freerdp-debuginfo 2.11.7-7.el9_8.6, libwinpr-debuginfo 2.11.7-7.el9_8.6, freerdp-debugsource 2.11.7-7.el9_8.6, freerdp-libs-debuginfo 2.11.7-7.el9_8.6
    fixed: vendor fix RHSA-2026:61379
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-server 3.10.3-12.el10_2.10
    fixed: vendor fix RHSA-2026:61378
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-server 3.10.3-3.el10_0.16
    fixed: vendor fix RHSA-2026:68706
  • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel 2.11.7-12.el8_10, freerdp-debuginfo 2.11.7-12.el8_10, libwinpr-debuginfo 2.11.7-12.el8_10, freerdp-debugsource 2.11.7-12.el8_10, freerdp-libs-debuginfo 2.11.7-12.el8_10
    fixed: vendor fix RHSA-2026:62571
  • Red Hat Enterprise Linux Server (v. 7 ELS) freerdp 2.1.1-5.el7_9.12, libwinpr 2.1.1-5.el7_9.12, freerdp-libs 2.1.1-5.el7_9.12 Red Hat Enterprise Linux Server Optional (v. 7 ELS) freerdp-devel 2.1.1-5.el7_9.12, libwinpr-devel 2.1.1-5.el7_9.12, freerdp-debuginfo 2.1.1-5.el7_9.12
    fixed: vendor fix RHSA-2026:68707

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hgj8-g595-wfc6 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • FreeRDP FreeRDP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.