CVE catalog
CVE-2026-91964
FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A
- Severity
- High · CVSS 8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.56% · Oct 25, 2026
FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | freerdp2 | bookworm | 2.11.7+dfsg1-6~deb12u1 | vulnerable |
| Ubuntu | freerdp | 16.04 | 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1 | vulnerable |
| Ubuntu | freerdp | 16.04 | 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.2 | vulnerable |
| Ubuntu | freerdp | 16.04 | 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.3 | vulnerable |
| Ubuntu | freerdp | 16.04 | 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.4 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.10.0+dfsg1-1.1ubuntu1 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.2+dfsg1-1 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.2+dfsg1-1build1 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.2+dfsg1-1build3 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.5+dfsg1-1build1 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.5+dfsg1-1build2 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.5+dfsg1-1ubuntu0.1~esm1 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.5+dfsg1-1ubuntu0.1~esm2 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.5+dfsg1-1ubuntu0.1~esm3 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.5+dfsg1-1ubuntu0.1~esm4 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.5+dfsg1-1ubuntu0.1~esm5 | vulnerable |
| Ubuntu | freerdp2 | pro | 2.11.5+dfsg1-1ubuntu0.1~esm6 | vulnerable |
| Ubuntu | freerdp | 18.04 | 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1 | vulnerable |
| Ubuntu | freerdp | 18.04 | 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.1 | vulnerable |
| Ubuntu | freerdp | 18.04 | 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.3.0+dfsg1-2build1 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.3.0+dfsg1-2ubuntu1 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.3.0+dfsg1-2ubuntu2 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.4.1+dfsg1-1 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.4.1+dfsg1-1ubuntu1 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.4.1+dfsg1-1ubuntu2 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.5.0+dfsg1-1 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.0+dfsg1-1 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-1 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu1 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.1 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.2 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.3 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.4 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.5 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.6 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.7 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.8 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.9 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.10 | vulnerable |
| Ubuntu | freerdp2 | 22.04 | 2.6.1+dfsg1-3ubuntu2.11 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.4.0+dfsg1-0ubuntu2 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.4.0+dfsg1-0ubuntu3 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.4.0+dfsg1-0ubuntu4 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.5.0+dfsg1-0ubuntu1 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.5.1+dfsg1-0ubuntu1 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.5.1+dfsg1-0ubuntu1.1 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.5.1+dfsg1-0ubuntu1.2 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.5.1+dfsg1-0ubuntu1.4 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.5.1+dfsg1-0ubuntu1.5 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.5.1+dfsg1-0ubuntu1.6 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.30.0+dfsg-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.30.0+dfsg-0ubuntu0.24.04.2 | vulnerable |
| Ubuntu | freerdp3 | 24.04 | 3.31.0+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | freerdp3 | 26.04 | 3.16.0+dfsg-2 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.18.0+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.19.0+dfsg-1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.19.1+dfsg-1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.20.0+dfsg-1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.20.2+dfsg-1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.21.0+dfsg-1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.22.0+dfsg-1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.24.1+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.24.2+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.24.2+dfsg-1ubuntu1.1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.30.0+dfsg-0ubuntu0.26.04.1 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.30.0+dfsg-0ubuntu0.26.04.2 | vulnerable |
| Ubuntu | freerdp3 | 26.04 | 3.31.0+dfsg-0ubuntu0.26.04.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | freerdp2 | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Ubuntu | freerdp3 | deb | 24.04 | 3.31.0+dfsg-0ubuntu0.24.04.1 | Not reported | UBUNTU-CVE-2026-91964 | Not reported |
| Ubuntu | freerdp3 | deb | 26.04 | 3.31.0+dfsg-0ubuntu0.26.04.1 | Not reported | UBUNTU-CVE-2026-91964 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [freerdp2-dev]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [freerdp2-shadow-x11]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [freerdp2-wayland]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [freerdp2-x11]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libfreerdp2-2]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libfreerdp-client2-2]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libfreerdp-server2-2]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libfreerdp-shadow2-2]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libfreerdp-shadow-subsystem2-2]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libuwac0-0]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libuwac0-dev]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libwinpr2-2]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libwinpr2-dev]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [libwinpr-tools2-2]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
- [winpr-utils]Affected
Source package: [freerdp2]
Details (2)
2.11.7+dfsg1-6~deb12u1· amd64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
2.11.7+dfsg1-6~deb12u1· arm64 · bookwormAffected
nvd · freerdp2 · debian · bookworm; nvd · freerdp2 · debian · 12
[Debian 13 (Trixie)]
- [freerdp3-dev]Affected
Source package: [freerdp3]
Details (4)
3.15.0+dfsg-2.1+deb13u3· amd64 · trixieAffected
nvd · freerdp3 · debian · 13
3.15.0+dfsg-2.1+deb13u3· arm64 · trixieAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· amd64 · trixie-backportsAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· arm64 · trixie-backportsAffected
nvd · freerdp3 · debian · 13
- [freerdp3-proxy]Affected
Source package: [freerdp3]
Details (4)
3.15.0+dfsg-2.1+deb13u3· amd64 · trixieAffected
nvd · freerdp3 · debian · 13
3.15.0+dfsg-2.1+deb13u3· arm64 · trixieAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · freerdp3 · debian · 13
- [freerdp3-proxy-modules]Affected
Source package: [freerdp3]
Details (4)
3.15.0+dfsg-2.1+deb13u3· amd64 · trixieAffected
nvd · freerdp3 · debian · 13
3.15.0+dfsg-2.1+deb13u3· arm64 · trixieAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · freerdp3 · debian · 13
- [freerdp3-sdl]Affected
Source package: [freerdp3]
Details (4)
3.15.0+dfsg-2.1+deb13u3· amd64 · trixieAffected
nvd · freerdp3 · debian · 13
3.15.0+dfsg-2.1+deb13u3· arm64 · trixieAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · freerdp3 · debian · 13
- [freerdp3-shadow-x11]Affected
Source package: [freerdp3]
Details (4)
3.15.0+dfsg-2.1+deb13u3· amd64 · trixieAffected
nvd · freerdp3 · debian · 13
3.15.0+dfsg-2.1+deb13u3· arm64 · trixieAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · freerdp3 · debian · 13
3.30.0+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · freerdp3 · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_75570.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-91964]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-91964]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-91964]
- [https://security-tracker.debian.org/tracker/CVE-2026-91964]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91964.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3057.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]