CVE-2026-31806
FreeRDP has a Heap Buffer Overflow in nsc_process_message() via Unchecked SURFACE_BITS_COMMAND Bitmap Dimensions
02 Description
FreeRDP has a Heap Buffer Overflow in nsc_process_message() via Unchecked SURFACE_BITS_COMMAND Bitmap Dimensions
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.66% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 51.5% of scored records. A rank, not a probability.
- NVD base score
- 9.3 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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
- NVD analysis status
- Modified. NVD last modified this record on 2026-07-15.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-03-13 17:40Z7 MO AGO
- Last updated
- 2026-07-15 01:08Z3 MO AGO
- Reserved
- 2026-03-09
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.3)
- CNA CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Weaknesses
- Data version
- 5.2
- Document digest
- 38516cd19501b6215f765aac8ba2d24be79851418719d16760102b33812287da
05 Affected products
06 References
- github.comhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrqm-46rj-cmx2
- github.comhttps://github.com/FreeRDP/FreeRDP/commit/83d9aedea278a74af3e490ff5eeb889c016dbb2b
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-31806
- bugzilla.redhat.comRHBZ#2447376https://bugzilla.redhat.com/show_bug.cgi?id=2447376
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31806.json
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:11323
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6743
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6799
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:19033
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6918
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:10734
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:10735
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:10951
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:10076
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:9640
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:9641
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6958
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6727
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6340
07 Fixed in
AlmaLinux 8
- freerdp Fixed in 2:2.11.7-6.el8_10
- freerdp-devel Fixed in 2:2.11.7-6.el8_10
- freerdp-libs Fixed in 2:2.11.7-6.el8_10
- libwinpr Fixed in 2:2.11.7-6.el8_10
- libwinpr-devel Fixed in 2:2.11.7-6.el8_10
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- freerdp Fixed in 2:2.11.7-1.el9_7.5
- freerdp-devel Fixed in 2:2.11.7-1.el9_7.5
- freerdp-libs Fixed in 2:2.11.7-1.el9_7.5
- libwinpr Fixed in 2:2.11.7-1.el9_7.5
- libwinpr-devel Fixed in 2:2.11.7-1.el9_7.5
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- freerdp Fixed in 2:3.10.3-5.el10_1.5
- freerdp-devel Fixed in 2:3.10.3-5.el10_1.5
- freerdp-libs Fixed in 2:3.10.3-5.el10_1.5
- freerdp-server Fixed in 2:3.10.3-5.el10_1.5
- libwinpr Fixed in 2:3.10.3-5.el10_1.5
- libwinpr-devel Fixed in 2:3.10.3-5.el10_1.5
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- freerdp Fixed in 2:2.11.7-6.el8_10
- freerdp-devel Fixed in 2:2.11.7-6.el8_10
- freerdp-libs Fixed in 2:2.11.7-6.el8_10
- libwinpr Fixed in 2:2.11.7-6.el8_10
- libwinpr-devel Fixed in 2:2.11.7-6.el8_10
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- freerdp Fixed in 2:2.11.7-1.el9_7.5
- freerdp-devel Fixed in 2:2.11.7-1.el9_7.5
- freerdp-libs Fixed in 2:2.11.7-1.el9_7.5
- libwinpr Fixed in 2:2.11.7-1.el9_7.5
- libwinpr-devel Fixed in 2:2.11.7-1.el9_7.5
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- freerdp Fixed in 2:3.10.3-5.el10_1.5
- freerdp-devel Fixed in 2:3.10.3-5.el10_1.5
- freerdp-libs Fixed in 2:3.10.3-5.el10_1.5
- freerdp-server Fixed in 2:3.10.3-5.el10_1.5
- libwinpr Fixed in 2:3.10.3-5.el10_1.5
- libwinpr-devel Fixed in 2:3.10.3-5.el10_1.5
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- freerdp2 No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- freerdp3 Fixed in 3.15.0+dfsg-2.1+deb13u2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- freerdp3 Fixed in 3.24.0+dfsg-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- freerdp No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- freerdp No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- freerdp2 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- freerdp3 Fixed in 3.30.0+dfsg-0ubuntu0.24.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- freerdp3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- freerdp2 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- freerdp2 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 24.04 LTS
- freerdp2 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.