RHSA-2026:76747
Vulnerability from csaf_redhat - Published: 2026-10-06 15:16 - Updated: 2026-10-06 23:33Summary
Red Hat Security Advisory: freerdp security update
Severity
Important
Notes
Topic: An update for freerdp is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.
Security Fix(es):
* FreeRDP: FreeRDP: Denial of Service via crafted Surface Bits command (CVE-2026-91954)
* FreeRDP: FreeRDP: Remote code execution via heap buffer overflow in Server Redirection PDU (CVE-2026-91964)
* FreeRDP: FreeRDP: Denial of Service via out-of-bounds read in URBDRC channel (CVE-2026-91956)
* FreeRDP: FreeRDP: Remote code execution via uninitialized heap memory disclosure (CVE-2026-91963)
* FreeRDP: FreeRDP: Denial of Service due to buffer over-read in RPC gateway (CVE-2026-91959)
* FreeRDP: FreeRDP: Heap buffer overflow via oversized LB_LOAD_BALANCE_INFO routing token can lead to heap corruption. (CVE-2026-91953)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in FreeRDP. A malicious RDP (Remote Desktop Protocol) server or a man-in-the-middle attacker could exploit a heap buffer overflow vulnerability during connection negotiation, prior to authentication. By sending a specially crafted Server Redirection PDU (Protocol Data Unit) with an oversized LB_LOAD_BALANCE_INFO field, an attacker could cause a denial of service or heap corruption on the client system.
6.5 (Medium)
Affected products
Fixed
65 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-2:2.11.7-14.el8_10.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-devel-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-devel-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-devel-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-devel-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:libwinpr-devel-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debuginfo-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-debugsource-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-devel-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-devel-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-devel-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-devel-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-devel-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:freerdp-libs-debuginfo-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:libwinpr-debuginfo-2:2.11.7-14.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can trigger a null pointer dereference in the `gdi_surface_bits` function by sending a specially crafted Surface Bits command that claims to use the NSCodec codec ID. This vulnerability exists even when the NSCodec is disabled in the client. Successful exploitation allows a remote attacker to cause a FreeRDP client to crash, leading to a denial of service.
6.5 (Medium)
Affected products
Fixed
65 products, the same list as for
CVE-2026-91953
Threats
Impact
Moderate
A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can exploit an out-of-bounds read vulnerability in the URBDRC (USB device redirection) channel. By sending a specially crafted message, the server can cause the FreeRDP client to read beyond its allocated memory, leading to a client crash and a denial of service.
6.5 (Medium)
Affected products
Fixed
65 products, the same list as for
CVE-2026-91953
Threats
Impact
Moderate
A flaw was found in FreeRDP. A remote attacker can exploit a buffer over-read vulnerability within the RPC (Remote Procedure Call) gateway transport parser by sending a malicious BIND_ACK Protocol Data Unit (PDU) with a truncated result entry. This can lead to a process abort, resulting in a Denial of Service (DoS).
6.5 (Medium)
Affected products
Fixed
65 products, the same list as for
CVE-2026-91953
Threats
Impact
Moderate
A flaw was found in FreeRDP. An uninitialized heap memory disclosure vulnerability exists in the urbdrc USB redirection channel. A malicious Remote Desktop Protocol (RDP) server can exploit this by inducing failing USB transfers, allowing it to read uninitialized heap memory from the client. This information disclosure can defeat Address Space Layout Randomization (ASLR), potentially enabling remote code execution when chained with other memory corruption vulnerabilities.
8.8 (High)
Affected products
Fixed
65 products, the same list as for
CVE-2026-91953
Threats
Impact
Important
A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can exploit a heap-based buffer overflow vulnerability in the `nego_send_negotiation_request` function. By sending a specially crafted Server Redirection PDU message with an attacker-controlled `LoadBalanceInfo` field, the server can write an arbitrary-length field into a fixed-size buffer without proper validation. This can lead to a denial of service (client crash) or, when chained with a memory disclosure vulnerability, potentially remote code execution on the client system.
8.8 (High)
Affected products
Fixed
65 products, the same list as for
CVE-2026-91953
Threats
Impact
Important
References
45 references
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"url": "https://access.redhat.com/errata/RHSA-2026:76747"
},
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
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"details": "Moderate"
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"title": "FreeRDP: FreeRDP: Heap buffer overflow via oversized LB_LOAD_BALANCE_INFO routing token can lead to heap corruption."
},
{
"cve": "CVE-2026-91954",
"cwe": {
"id": "CWE-476",
"name": "NULL Pointer Dereference"
},
"discovery_date": "2026-09-15T15:33:21.355451+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2533906"
}
],
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{
"category": "description",
"text": "A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can trigger a null pointer dereference in the `gdi_surface_bits` function by sending a specially crafted Surface Bits command that claims to use the NSCodec codec ID. This vulnerability exists even when the NSCodec is disabled in the client. Successful exploitation allows a remote attacker to cause a FreeRDP client to crash, leading to a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "FreeRDP: FreeRDP: Denial of Service via crafted Surface Bits command",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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},
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{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91954"
},
{
"category": "external",
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"category": "vendor_fix",
"date": "2026-10-06T15:16:12+00:00",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
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"details": "Moderate"
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"title": "FreeRDP: FreeRDP: Denial of Service via crafted Surface Bits command"
},
{
"cve": "CVE-2026-91956",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-09-15T15:37:28.975189+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2533927"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can exploit an out-of-bounds read vulnerability in the URBDRC (USB device redirection) channel. By sending a specially crafted message, the server can cause the FreeRDP client to read beyond its allocated memory, leading to a client crash and a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "FreeRDP: FreeRDP: Denial of Service via out-of-bounds read in URBDRC channel",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-91956"
},
{
"category": "external",
"summary": "RHBZ#2533927",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533927"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-91956",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-91956"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-91956",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91956"
},
{
"category": "external",
"summary": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hg4r-vv53-vwf8",
"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hg4r-vv53-vwf8"
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{
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"url": "https://www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-urbdrc"
}
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"release_date": "2026-09-15T15:18:11.941000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-06T15:16:12+00:00",
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{
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
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{
"category": "impact",
"details": "Moderate"
}
],
"title": "FreeRDP: FreeRDP: Denial of Service via out-of-bounds read in URBDRC channel"
},
{
"cve": "CVE-2026-91959",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-09-15T15:39:22.549708+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2533951"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in FreeRDP. A remote attacker can exploit a buffer over-read vulnerability within the RPC (Remote Procedure Call) gateway transport parser by sending a malicious BIND_ACK Protocol Data Unit (PDU) with a truncated result entry. This can lead to a process abort, resulting in a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "FreeRDP: FreeRDP: Denial of Service due to buffer over-read in RPC gateway",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-91959"
},
{
"category": "external",
"summary": "RHBZ#2533951",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533951"
},
{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-91959"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-91959",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91959"
},
{
"category": "external",
"summary": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-pj8w-fh79-f438",
"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-pj8w-fh79-f438"
},
{
"category": "external",
"summary": "https://www.vulncheck.com/advisories/freerdp-before-3.31.0-buffer-over-read-via-rts-gateway",
"url": "https://www.vulncheck.com/advisories/freerdp-before-3.31.0-buffer-over-read-via-rts-gateway"
}
],
"release_date": "2026-09-15T15:18:13.970000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-06T15:16:12+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"baseScore": 6.5,
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"details": "Moderate"
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"title": "FreeRDP: FreeRDP: Denial of Service due to buffer over-read in RPC gateway"
},
{
"cve": "CVE-2026-91963",
"cwe": {
"id": "CWE-824",
"name": "Access of Uninitialized Pointer"
},
"discovery_date": "2026-09-15T15:37:40.378590+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2533930"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in FreeRDP. An uninitialized heap memory disclosure vulnerability exists in the urbdrc USB redirection channel. A malicious Remote Desktop Protocol (RDP) server can exploit this by inducing failing USB transfers, allowing it to read uninitialized heap memory from the client. This information disclosure can defeat Address Space Layout Randomization (ASLR), potentially enabling remote code execution when chained with other memory corruption vulnerabilities.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "FreeRDP: FreeRDP: Remote code execution via uninitialized heap memory disclosure",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-91963"
},
{
"category": "external",
"summary": "RHBZ#2533930",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533930"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-91963",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-91963"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-91963",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91963"
},
{
"category": "external",
"summary": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hw7p-5h2r-83gq",
"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hw7p-5h2r-83gq"
},
{
"category": "external",
"summary": "https://www.vulncheck.com/advisories/freerdp-2.0.0-through-3.30.0-uninitialized-heap-memory-disclosure-via-urbdrc",
"url": "https://www.vulncheck.com/advisories/freerdp-2.0.0-through-3.30.0-uninitialized-heap-memory-disclosure-via-urbdrc"
}
],
"release_date": "2026-09-15T15:18:16.675000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-06T15:16:12+00:00",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
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"title": "FreeRDP: FreeRDP: Remote code execution via uninitialized heap memory disclosure"
},
{
"cve": "CVE-2026-91964",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
"discovery_date": "2026-09-15T15:34:59.900108+00:00",
"ids": [
{
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"text": "2533911"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can exploit a heap-based buffer overflow vulnerability in the `nego_send_negotiation_request` function. By sending a specially crafted Server Redirection PDU message with an attacker-controlled `LoadBalanceInfo` field, the server can write an arbitrary-length field into a fixed-size buffer without proper validation. This can lead to a denial of service (client crash) or, when chained with a memory disclosure vulnerability, potentially remote code execution on the client system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "FreeRDP: FreeRDP: Remote code execution via heap buffer overflow in Server Redirection PDU",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-91964"
},
{
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},
{
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"summary": "https://www.cve.org/CVERecord?id=CVE-2026-91964",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-91964"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-91964",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91964"
},
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"url": "https://www.vulncheck.com/advisories/freerdp-2.0.0-through-3.30.0-heap-buffer-overflow-via-routingtoken"
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"release_date": "2026-09-15T15:18:17.388000+00:00",
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{
"category": "vendor_fix",
"date": "2026-10-06T15:16:12+00:00",
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{
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "FreeRDP: FreeRDP: Remote code execution via heap buffer overflow in Server Redirection PDU"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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