High severity7.5NVD Advisory· Published Sep 15, 2026· Updated Sep 15, 2026

CVE-2026-91948

Description

FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in server-side static virtual channel handling when CHANNEL_OPTION_SHOW_PROTOCOL is enabled. Authenticated clients can queue oversized channel messages that cause buffer underflow and corrupt heap memory including live pointers, potentially enabling code execution.

Affected products

Freerdp/Freerdpllm-fuzzy
Range: <3.31.0

Patches

Vulnerability mechanics

References

github.com/FreeRDP/FreeRDP/commit/40d9202cd95551600c07437ce6bd5ecd7d31e57bnvd
github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9jcm-x588-gh26nvd
www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-write-via-show-protocolnvd

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