CVE-2026-67297

FreeRDP before 3.29.0 Resource Exhaustion via chunked HTTP response

Published Aug 1, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Description

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.

Analysis

Technical impact

FreeRDP versions prior to 3.29.0 contain a resource exhaustion flaw that allows an attacker to send oversized chunked HTTP responses, causing the client to consume memory until the configured size limit is reached, which can lead to application crashes and denial of service.

Affected Systems

Multiple builds of the FreeRDP client shipped by the FreeRDP project, all versions earlier than 3.29.0.

Risk and Exploitability

The CVSS score of 8.7 indicates a high severity vulnerability. EPSS data are unavailable, but the weakness remains serious where clients talk to an RD Gateway that the attacker can control. The flaw is listed as not yet in the CISA KEV catalog. Attackers would need network access to a malicious RD Gateway endpoint to feed oversized chunked HTTP responses to the client in order to exhaust its memory resources.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

FreeRDP

unaffected

Version	Status	Constraints
`0`	affected	< 3.29.0
`3.29.0`	unaffected	—

Configuration 1 [-]

cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*

No data.

Vendor Product Versions

Freerdp

Version	Status	Scheme	Platform
`[0,3.29.0)`	affected	semver	—
`3.29.0`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade FreeRDP to version 3.29.0 or later
Set a reasonable RESPONSE_SIZE_LIMIT on the client to bound memory usage
Restrict RD Gateway access to trusted networks or authenticated users

Generated by OpenCVE AI on August 2, 2026 at 03:15 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.521% probability within 30 days)

Exploitation poc

Automatable yes

Technical Impact partial

References

Link	Providers
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c6r-4pr4-9x8m
https://nvd.nist.gov/vuln/detail/CVE-2026-67297
https://www.cve.org/CVERecord?id=CVE-2026-67297
https://www.vulncheck.com/advisories/freerdp-before-resource-exhaustion-via-chunked-http-response

History

Aug 6, 2026 12:15 AM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://nvd.nist.gov/vuln/detail/CVE-2026-67297 https://www.cve.org/CVERecord?id=CVE-2026-67297
Metrics	threat_severity `None`	threat_severity `Moderate`

Aug 3, 2026 7:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Aug 1, 2026 12:45 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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.
Title		FreeRDP before 3.29.0 Resource Exhaustion via chunked HTTP response
First Time appeared		Freerdp Freerdp freerdp
Weaknesses		CWE-770
CPEs		cpe:2.3:a:freerdp:freerdp::::::::
Vendors & Products		Freerdp Freerdp freerdp
References		https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c6r-4pr4-9x8m https://www.vulncheck.com/advisories/freerdp-before-resource-exhaustion-via-chunked-http-response
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}` cvssV4_0 `{'score': 8.7, 'vector': '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'}`