Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M

CVE-2026-55648FreeRDP: Integer Overflow in `freerdp_image_copy_from_icon_data` Bypasses Bounds Check

Medium 6.1

In plain English

A medium-severity integer overflow in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.1Medium

Exploit odds (30 days)0.4%top 62.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, freerdp_image_copy_from_icon_data in libfreerdp/codec/color.c calculates nWidth multiplied by nHeight multiplied by FreeRDPGetBytesPerPixel(format) in 32-bit arithmetic. A malicious RDP server can send a RAIL TS_ICON_INFO update with dimensions such as 32768 by 32768 and 32 bits per pixel so the required-size calculation wraps, bypassing the cbBitsColor source bounds check before freerdp_image_copy_no_overlap reads attacker-controlled icon data. This affects RemoteApp clients using the vulnerable library path, while xfreerdp has a caller-side mitigation. This issue is fixed in version 3.27.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.24	freerdp	3.27.1-r0	ALPINE-CVE-2026-55648
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-55648
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-55648
Debian:14	freerdp3	3.27.0+dfsg-1	DEBIAN-CVE-2026-55648
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-55648
Ubuntu:24.04:LTS	freerdp3	3.30.0+dfsg-0ubuntu0.24.04.1	USN-8561-1
Ubuntu:24.04:LTS	freerdp3	3.30.0+dfsg-0ubuntu0.24.04.1	UBUNTU-CVE-2026-55648
Ubuntu:25.10	freerdp3	no fix listed	UBUNTU-CVE-2026-55648
Ubuntu:26.04:LTS	freerdp3	3.30.0+dfsg-0ubuntu0.26.04.1	USN-8561-1
Ubuntu:26.04:LTS	freerdp3	3.30.0+dfsg-0ubuntu0.26.04.1	UBUNTU-CVE-2026-55648

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	< 3.27.0

Weakness: CWE-190 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5c5v-f78v-h2f6 x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/pull/12877 x_refsource_MISC
https://github.com/FreeRDP/FreeRDP/commit/e4ae473da2926724d9b6329778797a3bdea79eb3 x_refsource_MISC
https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0 x_refsource_MISC