CVE-2026-33983VulnerabilityPublished 20 Apr 2026Updated 6 Oct 2026

Red Hat Security Advisory: freerdp security update

Affects Red Hat freerdpSource GCVE Database

Compare

Mentioned vulnerabilities

CVE-2026-33984

Not known to be exploited : upgrade Red Hat freerdp to 8.10 soon.

Data as of 30 Oct 2026, 11:52 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.4% chance of exploitation in 30 days – higher than 38% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 8.10

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Red Hat freerdp to 8.10.

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=8.0.0 <8.10	Fixed in 8.10

AI-suggested

Red Hat has released updated freerdp packages for Red Hat Enterprise Linux 8 and related distributions that address these vulnerabilities. Users should apply the security update as described in Red Hat advisory RHSA-2026:8945 and the article at https://access.redhat.com/articles/11258 to remediate these issues. No additional mitigation steps are indicated by the vendor.

Description

Two security vulnerabilities have been identified in FreeRDP, a free implementation of the Remote Desktop Protocol (RDP) used by the xfreerdp client. The first vulnerability (CVE-2026-33984) is a heap buffer overflow that allows arbitrary code execution via crafted pixel data. The second vulnerability (CVE-2026-33983) allows denial of service through specially crafted RDP messages. These issues affect Red Hat Enterprise Linux 8 and related distributions. Red Hat has issued an important security update to address these flaws.

Impact

Successful exploitation of CVE-2026-33984 could allow an attacker to execute arbitrary code on the affected system, potentially leading to full system compromise. CVE-2026-33983 could cause denial of service by crashing the RDP client when processing maliciously crafted protocol messages. Both vulnerabilities pose significant risks to systems using the affected FreeRDP versions.

Summary

FreeRDP, an open-source RDP client, contains two vulnerabilities: a heap buffer overflow (CVE-2026-33984) that enables arbitrary code execution when processing crafted pixel data, and a denial of service vulnerability (CVE-2026-33983) triggered by specially crafted RDP messages. These vulnerabilities affect multiple architectures of Red Hat Enterprise Linux 8 and its CodeReady Linux Builder variants. Red Hat has released updated packages to fix these issues as detailed in advisory RHSA-2026:8945.

CWE-190Integer Overflow or Wraparound (opens in a new tab)
Base weaknessLikelihood of exploit: Medium
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
Requirements
Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V5.4.3 (opens in a new tab)
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
Attack patterns
Forced Integer Overflow (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-131Incorrect Calculation of Buffer Size (opens in a new tab)
Base weaknessLikelihood of exploit: High
The product does not correctly calculate the size to be used when allocating a buffer.
Implementation
When allocating a buffer for the purpose of transforming, converting, or encoding an input, allocate enough memory to handle the largest possible encoding. For example, in a routine that converts "&" characters to "&" for HTML entity encoding, the output buffer needs to be at least 5 times as large as the input…
Implementation
Understand the programming language's underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, "not-a-number" calculations, and how the language handles…
Implementation · Input Validation
Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
Attack patterns
Overflow Buffers (opens in a new tab)
Buffer Overflow via Parameter Expansion (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Oct 2026, 22:17 UTC

WeaknessesCWE-190, CWE-131

Technical details

References

Community reviews

Related threats