CVE-2026-22855VulnerabilityPublished 12 Mar 2026Updated 18 Aug 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 : upgrade Red Hat freerdp to 8.8.2 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: 0.8% chance of exploitation in 30 days – higher than 59% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 8.8.2

Exploitation evidence

Disclosed: evidence found.
CVE published 12 Mar 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 8.8.2.

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=8.8 <8.8.2	Fixed in 8.8.2

AI-suggested

Red Hat has released updated freerdp packages (version 2.2.0-12.el8_8.2) that fix the identified buffer overflow vulnerabilities. Users of affected Red Hat Enterprise Linux 8.8 systems should apply these updates promptly. For detailed update instructions, refer to Red Hat's official article: https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patches.

Description

Multiple heap and global buffer overflow vulnerabilities have been identified in FreeRDP, a free implementation of the Remote Desktop Protocol client. These vulnerabilities affect the freerdp package in Red Hat Enterprise Linux 8.8 and related update services. Red Hat has released security updates addressing these issues. The vulnerabilities are rated with a high security impact by Red Hat Product Security. No CVSS scores are provided in the advisory, but the issues involve memory corruption risks.

Impact

The vulnerabilities involve buffer overflows in FreeRDP, which may allow an attacker to cause memory corruption. This can lead to potential denial of service or other impacts depending on exploitation. Red Hat rates the security impact as Important (high), but no confirmed exploits in the wild are reported. The issues affect the freerdp client used in remote desktop scenarios.

Summary

The advisory addresses three security flaws in FreeRDP: two heap-buffer-overflow vulnerabilities (CVE-2026-22855 and CVE-2026-22859) and one global-buffer-overflow vulnerability (CVE-2026-22858). These vulnerabilities could potentially lead to memory corruption. The affected software is the freerdp client used to connect to RDP servers, including Microsoft Windows machines, xrdp, and VirtualBox. Red Hat has issued updated freerdp packages for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Telecommunications Update Service to remediate these issues.

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-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).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 18 Aug 2026, 13:57 UTC

WeaknessesCWE-125, CWE-787

Technical details

References

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