CVE-2026-67297: FreeRDP before 3.29.0 Resource Exhaustion via chunked HTTP response

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-08-01 · updated 2026-09-11
Weakness: CWE-770

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.

Affected products

FreeRDP: before 3.29.0 — fixed in 3.29.0

How to fix

Upgrade to a fixed version: FreeRDP 3.29.0. Check the vendor advisory for mitigations.

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
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c6r-4pr4-9x8m

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