CVE-2026-25952VulnerabilityPublished 26 May 2026Updated 6 Oct 2026

Red Hat Security Advisory: freerdp security update

Affects Red Hat freerdpSource GCVE Database

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Mentioned vulnerabilities

Not known to be exploited.

Data as of 30 Oct 2026, 11:52 UTC

Severity

Medium

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

EPSS: 0.6% chance of exploitation in 30 days – higher than 52% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 May 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

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=10.0 <=10.0 Red Hat Red Hat Enterprise Linux Red Hat Enterprise Linux AppStream EUS (v. 10.0) Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) x86_64	Fixed in–

AI-suggested

Red Hat has released updated FreeRDP packages (version 3.10.3-3.el10_0.7) that fix all listed vulnerabilities. Users of affected Red Hat Enterprise Linux 10.0 Extended Update Support and CodeReady Linux Builder products should apply these updates promptly. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigations are specified or required beyond applying the official patches.

Description

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 heap use-after-free during auto-reconnect (CVE-2026-25997) * freerdp: FreeRDP: Denial of service due to use-after-free vulnerability (CVE-2026-25952) * freerdp: FreeRDP: Denial of Service via double free vulnerability during disconnect (CVE-2026-26986) * freerdp: FreeRDP has a heap-buffer-overflow in bitmap_cache_put via OOB cacheId (CVE-2026-29775) * freerdp: FreeRDP has an out-of-bounds read in ADPCM decoders due to missing predictor/step_index bounds checks (CVE-2026-31885) * freerdp: FreeRDP has a division-by-zero in ADPCM decoders when `nBlockAlign` is 0 (CVE-2026-31884) * freerdp: FreeRDP: Denial of Service via crafted audio data in RDP (CVE-2026-31883) * FreeRDP: FreeRDP: Information disclosure via heap memory out of bounds read (CVE-2026-33985) * FreeRDP: FreeRDP: Information disclosure and denial of service via heap-buffer-overflow read (CVE-2026-33982) * FreeRDP: FreeRDP: Memory corruption vulnerability allows denial of service or arbitrary code execution (CVE-2026-33987) 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.

Impact

The vulnerabilities collectively allow an attacker to cause denial of service conditions through various memory corruption issues such as use-after-free, double free, heap-buffer-overflow, out-of-bounds reads, and division-by-zero errors. Some vulnerabilities also allow information disclosure via out-of-bounds heap reads. One memory corruption vulnerability could potentially allow arbitrary code execution, increasing the risk beyond denial of service. These issues affect the FreeRDP client used to connect to RDP servers, potentially impacting systems running vulnerable versions of FreeRDP on Red Hat Enterprise Linux 10.0 Extended Update Support and related products.

Summary

This advisory covers a set of ten security vulnerabilities in FreeRDP, including CVE-2026-25952 and nine others, that affect the FreeRDP client implementation. The flaws include heap use-after-free during auto-reconnect, use-after-free, double free during disconnect, heap-buffer-overflow via out-of-bounds cacheId, out-of-bounds read in ADPCM decoders due to missing bounds checks, division-by-zero in ADPCM decoders, denial of service via crafted audio data, information disclosure via heap out-of-bounds read, and memory corruption that may allow denial of service or arbitrary code execution. These vulnerabilities impact the FreeRDP packages distributed with Red Hat Enterprise Linux 10.0 Extended Update Support and related CodeReady Linux Builder products across multiple CPU architectures (x86_64, s390x, ppc64le, aarch64). Red Hat has issued updated freerdp packages (version 3.10.3-3.el10_0.7) that address these vulnerabilities. The advisory rates the security impact as Moderate (medium severity).

CWE-825Expired Pointer Dereference (opens in a new tab)
Base weakness
The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.
Architecture and Design
Choose a language that provides automatic memory management.
Implementation
When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-787Out-of-bounds Write (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #5
The product writes data past the end, or before the beginning, of the intended buffer.
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.
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-191Integer Underflow (Wrap or Wraparound) (opens in a new tab)
Base weakness
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
CWE-369Divide By Zero (opens in a new tab)
Base weaknessLikelihood of exploit: MediumOWASP Top 10 A10:2025: Mishandling of Exceptional Conditions (opens in a new tab)
The product divides a value by zero.
OWASP Cheat Sheets
Logging (opens in a new tab)
Error Handling (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-125Out-of-bounds Read (opens in a new tab)
Base weaknessCWE Top 25 (2025): #8
The product reads data past the end, or before the beginning, of the intended buffer.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design · Language Selection
Use a language that provides appropriate memory abstractions.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Overread Buffers (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

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 13 Jul 2026, 10:56 UTC

WeaknessesCWE-825, CWE-787, CWE-191 +3

Technical details

References

Community reviews

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