CVE-2026-33983
FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS
02 Description
FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS
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.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.44% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 38.2% of scored records. A rank, not a probability.
- NVD base score
- 6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- 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
- 2026-03-30 21:42Z7 MO AGO
- Last updated
- 2026-07-15 01:05Z3 MO AGO
- Reserved
- 2026-03-24
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 6.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- a7ce43de27a706def202d42adb3989a524e238a1a182dc01c15b8424ccaaa80d
05 Affected products
06 References
- github.comhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gfm-4p52-h478
- github.comhttps://github.com/FreeRDP/FreeRDP/commit/78188ab479c8e6eb9ba2475b3732c76b4bbe5425
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-33983
- bugzilla.redhat.comRHBZ#2453220https://bugzilla.redhat.com/show_bug.cgi?id=2453220
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33983.json
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:11333
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:8458
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:19033
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:8945
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:11651
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:11649
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:12388
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:12359
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:11332
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:11336
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:10709
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:9656
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:8457
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:19349
07 Fixed in
AlmaLinux 8
- freerdp Fixed in 2:2.11.7-7.el8_10
- freerdp-devel Fixed in 2:2.11.7-7.el8_10
- freerdp-libs Fixed in 2:2.11.7-7.el8_10
- libwinpr Fixed in 2:2.11.7-7.el8_10
- libwinpr-devel Fixed in 2:2.11.7-7.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_7.6
- freerdp-devel Fixed in 2:2.11.7-1.el9_7.6
- freerdp-libs Fixed in 2:2.11.7-1.el9_7.6
- libwinpr Fixed in 2:2.11.7-1.el9_7.6
- libwinpr-devel Fixed in 2:2.11.7-1.el9_7.6
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_1.6
- freerdp-devel Fixed in 2:3.10.3-5.el10_1.6
- freerdp-libs Fixed in 2:3.10.3-5.el10_1.6
- freerdp-server Fixed in 2:3.10.3-5.el10_1.6
- libwinpr Fixed in 2:3.10.3-5.el10_1.6
- libwinpr-devel Fixed in 2:3.10.3-5.el10_1.6
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 2:2.11.7-7.el8_10
- freerdp-devel Fixed in 2:2.11.7-7.el8_10
- freerdp-libs Fixed in 2:2.11.7-7.el8_10
- libwinpr Fixed in 2:2.11.7-7.el8_10
- libwinpr-devel Fixed in 2:2.11.7-7.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_7.6
- freerdp-devel Fixed in 2:2.11.7-1.el9_7.6
- freerdp-libs Fixed in 2:2.11.7-1.el9_7.6
- libwinpr Fixed in 2:2.11.7-1.el9_7.6
- libwinpr-devel Fixed in 2:2.11.7-1.el9_7.6
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_1.6
- freerdp-devel Fixed in 2:3.10.3-5.el10_1.6
- freerdp-libs Fixed in 2:3.10.3-5.el10_1.6
- freerdp-server Fixed in 2:3.10.3-5.el10_1.6
- libwinpr Fixed in 2:3.10.3-5.el10_1.6
- libwinpr-devel Fixed in 2:3.10.3-5.el10_1.6
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 3.24.2+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.