CVE-2026-31806
CVE-2026-31806 · FreeRDP has a Heap Buffer Overflow in nsc_process_message() via Unchecked SURFACE_BITS_COMMAND Bitmap Dimensions
This page contains facts from public vulnerability sources. Check the original advisory before updating.
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size. Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, the overflow may be exploitable to overwrite adjacent heap memory. This vulnerability is fixed in 3.24.0.
CVSS 9.3 · Critical · EPSS 0.7% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
freerdp
- Versions
- < 3.24.0: Affected
No fix published
freerdp2 Debian:12
- Versions
- 2.10.0+dfsg1-1
- 2.10.0+dfsg1-1.1
- 2.11.2+dfsg1-1
- 2.11.2+dfsg1-1.1~exp1
- 2.11.2+dfsg1-1.1~exp2
- 2.11.5+dfsg1-1
- 2.11.7+dfsg1-1
- 2.11.7+dfsg1-2
- 2.11.7+dfsg1-3
- 2.11.7+dfsg1-4
- 2.11.7+dfsg1-5
- 2.11.7+dfsg1-6
- 2.11.7+dfsg1-6~deb12u1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
freerdp3 Debian:13
- Versions
- 3.15.0+dfsg-2.1
- 3.15.0+dfsg-2.1+deb13u1
- Affected ranges
- ECOSYSTEM: < 3.15.0+dfsg-2.1+deb13u2
Update to 3.15.0+dfsg-2.1+deb13u2
freerdp3 Debian:14
- Versions
- 3.15.0+dfsg-2.1
- 3.16.0+dfsg-1
- 3.16.0+dfsg-2
- 3.17.0+dfsg-1
- 3.17.1+dfsg-1
- 3.17.1+dfsg-2
- 3.17.2+dfsg-1
- 3.17.2+dfsg-2
- 3.17.2+dfsg-3
- 3.18.0+dfsg-1
- 3.19.0+dfsg-1
- 3.19.1+dfsg-1
- 3.20.0+dfsg-1
- 3.20.2+dfsg-1
- 3.21.0+dfsg-1
- 3.22.0+dfsg-1
- 3.22.0+dfsg-1~bpo13+0
- 3.22.0+dfsg-1~bpo13+1
- 3.22.0+dfsg-3
- 3.23.0+dfsg-1
- 3.23.0+dfsg-1~bpo13+1
- Affected ranges
- ECOSYSTEM: < 3.24.0+dfsg-1
Update to 3.24.0+dfsg-1
freerdp Ubuntu:16.04:LTS
- Versions
- 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1
- 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.2
- 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.3
- 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
freerdp2 Ubuntu:Pro:18.04:LTS
- Versions
- 2.0.0~git20170725.1.1648deb+dfsg1-1
- 2.0.0~git20170725.1.1648deb+dfsg1-5
- 2.0.0~git20170725.1.1648deb+dfsg1-5ubuntu1
- 2.0.0~git20170725.1.1648deb+dfsg1-5ubuntu2
- 2.0.0~git20170725.1.1648deb+dfsg1-6
- 2.0.0~git20170725.1.1648deb+dfsg1-6build1
- 2.0.0~git20170725.1.1648deb+dfsg1-7
- 2.0.0~git20170725.1.1648deb+dfsg1-7ubuntu0.1
- 2.1.1+dfsg1-0ubuntu0.18.04.1
- 2.2.0+dfsg1-0ubuntu0.18.04.1
- 2.2.0+dfsg1-0ubuntu0.18.04.2
- 2.2.0+dfsg1-0ubuntu0.18.04.3
- 2.2.0+dfsg1-0ubuntu0.18.04.4
- 2.2.0+dfsg1-0ubuntu0.18.04.4+esm1
- 2.2.0+dfsg1-0ubuntu0.18.04.4+esm2
- 2.2.0+dfsg1-0ubuntu0.18.04.4+esm3
- 2.2.0+dfsg1-0ubuntu0.18.04.4+esm4
- 2.2.0+dfsg1-0ubuntu0.18.04.4+esm5
- 2.2.0+dfsg1-0ubuntu0.18.04.4+esm6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
freerdp Ubuntu:18.04:LTS
- Versions
- 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1
- 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.1
- 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
freerdp2 Ubuntu:Pro:20.04:LTS
- Versions
- 2.0.0~git20190204.1.2693389a+dfsg1-1
- 2.0.0~git20190204.1.2693389a+dfsg1-2
- 2.0.0~git20190204.1.2693389a+dfsg1-2build1
- 2.0.0~git20190204.1.2693389a+dfsg1-2build2
- 2.1.1+dfsg1-0ubuntu0.20.04.1
- 2.2.0+dfsg1-0ubuntu0.20.04.1
- 2.2.0+dfsg1-0ubuntu0.20.04.2
- 2.2.0+dfsg1-0ubuntu0.20.04.3
- 2.2.0+dfsg1-0ubuntu0.20.04.4
- 2.2.0+dfsg1-0ubuntu0.20.04.5
- 2.2.0+dfsg1-0ubuntu0.20.04.6
- 2.6.1+dfsg1-0ubuntu0.20.04.1
- 2.6.1+dfsg1-0ubuntu0.20.04.2
- 2.6.1+dfsg1-0ubuntu0.20.04.2+esm1
- 2.6.1+dfsg1-0ubuntu0.20.04.2+esm2
- 2.6.1+dfsg1-0ubuntu0.20.04.2+esm3
- 2.6.1+dfsg1-0ubuntu0.20.04.2+esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
freerdp2 Ubuntu:22.04:LTS
- Versions
- 2.3.0+dfsg1-2build1
- 2.3.0+dfsg1-2ubuntu1
- 2.3.0+dfsg1-2ubuntu2
- 2.4.1+dfsg1-1
- 2.4.1+dfsg1-1ubuntu1
- 2.4.1+dfsg1-1ubuntu2
- 2.5.0+dfsg1-1
- 2.6.0+dfsg1-1
- 2.6.1+dfsg1-1
- 2.6.1+dfsg1-3
- 2.6.1+dfsg1-3ubuntu1
- 2.6.1+dfsg1-3ubuntu2
- 2.6.1+dfsg1-3ubuntu2.1
- 2.6.1+dfsg1-3ubuntu2.2
- 2.6.1+dfsg1-3ubuntu2.3
- 2.6.1+dfsg1-3ubuntu2.4
- 2.6.1+dfsg1-3ubuntu2.5
- 2.6.1+dfsg1-3ubuntu2.6
- 2.6.1+dfsg1-3ubuntu2.7
- 2.6.1+dfsg1-3ubuntu2.8
- 2.6.1+dfsg1-3ubuntu2.9
- 2.6.1+dfsg1-3ubuntu2.10
- 2.6.1+dfsg1-3ubuntu2.11
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
freerdp3 Ubuntu:24.04:LTS
- Versions
- 3.4.0+dfsg1-0ubuntu2
- 3.4.0+dfsg1-0ubuntu3
- 3.4.0+dfsg1-0ubuntu4
- 3.5.0+dfsg1-0ubuntu1
- 3.5.1+dfsg1-0ubuntu1
- 3.5.1+dfsg1-0ubuntu1.1
- 3.5.1+dfsg1-0ubuntu1.2
- 3.5.1+dfsg1-0ubuntu1.4
- 3.5.1+dfsg1-0ubuntu1.5
- 3.5.1+dfsg1-0ubuntu1.6
- Affected ranges
- ECOSYSTEM: < 3.30.0+dfsg-0ubuntu0.24.04.1
Update to 3.30.0+dfsg-0ubuntu0.24.04.1
freerdp2 Ubuntu:Pro:24.04:LTS
- Versions
- 2.10.0+dfsg1-1.1ubuntu1
- 2.11.2+dfsg1-1
- 2.11.2+dfsg1-1build1
- 2.11.2+dfsg1-1build3
- 2.11.5+dfsg1-1build1
- 2.11.5+dfsg1-1build2
- 2.11.5+dfsg1-1ubuntu0.1~esm1
- 2.11.5+dfsg1-1ubuntu0.1~esm2
- 2.11.5+dfsg1-1ubuntu0.1~esm3
- 2.11.5+dfsg1-1ubuntu0.1~esm4
- 2.11.5+dfsg1-1ubuntu0.1~esm5
- 2.11.5+dfsg1-1ubuntu0.1~esm6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
freerdp3 Ubuntu:25.10
- Versions
- 3.14.0+dfsg-1ubuntu1
- 3.15.0+dfsg-2.1
- 3.16.0+dfsg-1ubuntu1
- 3.16.0+dfsg-2
- 3.16.0+dfsg-2ubuntu0.1
- 3.16.0+dfsg-2ubuntu0.3
- 3.16.0+dfsg-2ubuntu0.4
- 3.16.0+dfsg-2ubuntu0.5
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrqm-46rj-cmx2
- https://github.com/FreeRDP/FreeRDP/commit/83d9aedea278a74af3e490ff5eeb889c016dbb2b
- https://access.redhat.com/security/cve/CVE-2026-31806
- https://bugzilla.redhat.com/show_bug.cgi?id=2447376
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31806.json
- https://access.redhat.com/errata/RHSA-2026:11323
- https://access.redhat.com/errata/RHSA-2026:6743
- https://access.redhat.com/errata/RHSA-2026:6799
- https://access.redhat.com/errata/RHSA-2026:19033
- https://access.redhat.com/errata/RHSA-2026:6918
- https://access.redhat.com/errata/RHSA-2026:10734
- https://access.redhat.com/errata/RHSA-2026:10735
- https://access.redhat.com/errata/RHSA-2026:10951
- https://access.redhat.com/errata/RHSA-2026:10076
- https://access.redhat.com/errata/RHSA-2026:9640
- https://access.redhat.com/errata/RHSA-2026:9641
- https://access.redhat.com/errata/RHSA-2026:6958
- https://access.redhat.com/errata/RHSA-2026:6727
- https://access.redhat.com/errata/RHSA-2026:6340
- https://nvd.nist.gov/vuln/detail/CVE-2026-31806