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FreeRDP EUVDEUVD-2026-51856

| CVE-2026-67297 HIGH
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-08-01 VulnCheck GHSA-43rq-pv9m-43rf
Denial Of Service Freerdp
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

Attacker controls the network endpoint (gateway server), so AV:N and PR:N apply; impact is pure availability loss with no confidentiality or integrity breach.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Analysis Generated
Aug 01, 2026 - 13:11 vuln.today
Patch available
Aug 01, 2026 - 13:01 EUVD
CVE Published
Aug 01, 2026 - 12:22 cve.org
HIGH 8.7

DescriptionCVE.org

FreeRDP before 3.29.0 fails to enforce the RESPONSE_SIZE_LIMIT when processing Transfer-Encoding: chunked HTTP responses in http_response_recv_body(). Attackers controlling a malicious RD Gateway endpoint can send oversized chunked response bodies to exhaust client memory resources without triggering the configured size limit.

AnalysisAI

Memory exhaustion in FreeRDP before 3.29.0 allows unauthenticated attackers controlling a malicious RD Gateway endpoint to crash the client by sending Transfer-Encoding: chunked HTTP response bodies of unbounded size. The http_response_recv_body() function fails to enforce the configured RESPONSE_SIZE_LIMIT exclusively for chunked responses, creating an exploitable gap in the intended safety boundary. No active exploitation (CISA KEV) or public POC has been identified, but the CVSS 4.0 score of 8.7 reflects the low attack complexity once an attacker can serve a malicious gateway response.

Technical ContextAI

FreeRDP is an open-source Remote Desktop Protocol client library (CPE: cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*) that implements the RD Gateway tunneling protocol over HTTPS. The vulnerability resides in the HTTP response body parsing layer - specifically http_response_recv_body() - which handles chunked transfer encoding as defined by HTTP/1.1 (Transfer-Encoding: chunked). The root cause maps to CWE-770 (Allocation of Resources Without Limits or Throttling): the code enforces RESPONSE_SIZE_LIMIT only on non-chunked responses, while the chunked path allocates heap memory in unbounded increments driven by attacker-controlled chunk sizes. Because RD Gateway communication is initiated over HTTPS, the attacker acts as the TLS-terminating server and controls the full HTTP response content and framing. All releases from version 0 through 3.28.x are affected.

RemediationAI

Upgrade FreeRDP to version 3.29.0 or later, which enforces RESPONSE_SIZE_LIMIT for chunked HTTP responses. The vendor advisory at https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c6r-4pr4-9x8m contains the authoritative patch details. If an immediate upgrade is not feasible, restrict FreeRDP clients via firewall or endpoint policy to connect only to a known allowlist of trusted RD Gateway hostnames and IP addresses - this prevents an attacker from substituting a malicious gateway. Blocking outbound HTTPS (TCP/443) to unauthorized RD Gateway targets eliminates the attack surface but may be operationally disruptive in environments with dynamic gateway configurations. OS-level memory limits (e.g., ulimit on Linux) can reduce the blast radius of a successful exhaustion attempt but do not prevent process termination.

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Same weakness CWE-770 – Allocation of Resources Without Limits or Throttling

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Same technique Denial Of Service

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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Not-Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-51856 vulnerability details – vuln.today
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