CVE-2026-67297 FreeRDP before 3.29.0 Resource Exhaustion via chunked HTTP response
Attackers can exhaust client memory via oversized chunked HTTP responses from malicious RD Gateways, requiring an upgrade to FreeRDP.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-67297?
CVE-2026-67297 is a high-severity denial of service vulnerability in Freerdp Freerdp, published on 1 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-67297?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-67297?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-67297 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67297 exists.
Other vulnerabilities in Freerdp Freerdp
- CVE-2021-37594 Other in n/a
- CVE-2021-37595 Other in n/a
- CVE-2026-67305 FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
- CVE-2026-66402 FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
- CVE-2026-67289 FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection
Sources
Also known as DEBIAN-CVE-2026-67297, GHSA-2c6r-4pr4-9x8m, GHSA-43rq-pv9m-43rf, UBUNTU-CVE-2026-67297.