RHSA-2026:12359
Vulnerability from csaf_redhat - Published: 2026-04-30 17:53 - Updated: 2026-04-30 21:35Summary
Red Hat Security Advisory: freerdp security update
Severity
Important
Notes
Topic: An update for freerdp is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.
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: Heap buffer overflow allows arbitrary code execution via crafted pixel data (CVE-2026-33984)
* FreeRDP: FreeRDP: Denial of Service via specially crafted Remote Desktop Protocol messages (CVE-2026-33983)
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 free implementation of the Remote Desktop Protocol (RDP). A remote attacker could exploit this vulnerability by sending a specially crafted RDP message. This can lead to an undefined behavior where a wrapped value is used as a shift exponent, causing an approximately 80 billion iteration loop. This results in a Denial of Service (DoS) due to excessive CPU utilization.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:12359
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol. A remote attacker could exploit a heap buffer overflow vulnerability in the `resize_vbar_entry()` function. This occurs when an error in buffer resizing leads to attacker-controlled pixel data being written into an undersized memory buffer. Successful exploitation could result in arbitrary code execution.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:12359
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
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"text": "A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol (RDP). A remote attacker could exploit this vulnerability by sending a specially crafted RDP message. This can lead to an undefined behavior where a wrapped value is used as a shift exponent, causing an approximately 80 billion iteration loop. This results in a Denial of Service (DoS) due to excessive CPU utilization.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "FreeRDP: FreeRDP: Denial of Service via specially crafted Remote Desktop Protocol messages",
"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": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453220"
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{
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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33983",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33983"
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{
"category": "external",
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"title": "FreeRDP: FreeRDP: Denial of Service via specially crafted Remote Desktop Protocol messages"
},
{
"cve": "CVE-2026-33984",
"cwe": {
"id": "CWE-131",
"name": "Incorrect Calculation of Buffer Size"
},
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"ids": [
{
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}
],
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{
"category": "description",
"text": "A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol. A remote attacker could exploit a heap buffer overflow vulnerability in the `resize_vbar_entry()` function. This occurs when an error in buffer resizing leads to attacker-controlled pixel data being written into an undersized memory buffer. Successful exploitation could result in arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "FreeRDP: FreeRDP: Heap buffer overflow allows arbitrary code execution via crafted pixel data",
"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": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-33984"
},
{
"category": "external",
"summary": "RHBZ#2453219",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453219"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-33984",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33984"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33984",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33984"
},
{
"category": "external",
"summary": "https://github.com/FreeRDP/FreeRDP/commit/dc7fdb165095139be779a4000199bc1706b06ad5",
"url": "https://github.com/FreeRDP/FreeRDP/commit/dc7fdb165095139be779a4000199bc1706b06ad5"
},
{
"category": "external",
"summary": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8469-2xcx-frf6",
"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8469-2xcx-frf6"
}
],
"release_date": "2026-03-30T21:42:57.090000+00:00",
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{
"category": "vendor_fix",
"date": "2026-04-30T17:53:34+00:00",
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "FreeRDP: FreeRDP: Heap buffer overflow allows arbitrary code execution via crafted pixel data"
}
]
}
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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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