High severity7.5NVD Advisory· Published Sep 15, 2026· Updated Sep 17, 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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

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

News mentions

FreeRDP: 20 Vulnerabilities Disclosed, Including Critical RDSTLS Bypass
Vypr Intelligence · Sep 15, 2026

cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000