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CVE-2026-91946— FreeRDP before 3.31.0 Information Disclosure via RDPGFX ResetGraphics

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP 3.31.0 之前的版本存在一个信息泄露漏洞：RDPGFX 服务器的 PDU 序列化器未对固定 340 字节线缆格式中的填充字节进行初始化。攻击者可以通过 PDU 接收到未初始化的堆内存，其中包含活跃的指针和 GLib 函数地址，从而绕过堆 ASLR 并泄露 GLib 模块的基地址。

CVSS 6.5 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP 2.0.0< 3.31.0 affected
3.31.0 unaffected
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I. Basic Information for CVE-2026-91946

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.31.0 Information Disclosure via RDPGFX ResetGraphics
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP versions before 3.31.0 contain an information disclosure vulnerability in the RDPGFX server's ResetGraphics PDU serializer that fails to initialize padding bytes in the fixed 340-byte wire format. Attackers can receive uninitialized heap memory including live pointers and GLib function addresses transmitted in the PDU, defeating heap ASLR and disclosing the GLib module base address.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 2.0.0 ~ 3.31.0 -

II. Public POCs for CVE-2026-91946

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III. Intelligence Information for CVE-2026-91946

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Patches & Fixes for CVE-2026-91946 (1)

Vendor Advisories for CVE-2026-91946 (2)

Same Patch Batch · FreeRDP · 2026-09-15 · 20 CVEs total

CVE-2026-91949 9.3 CRITICAL FreeRDP 3.0.0 through 3.30.0 Protocol Negotiation Bypass
CVE-2026-91964 8.8 HIGH FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken
CVE-2026-91948 7.5 HIGH FreeRDP before 3.31.0 Out-of-bounds Write via SHOW_PROTOCOL
CVE-2026-91947 7.5 HIGH FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC
CVE-2026-91955 7.5 HIGH FreeRDP before 3.31.0 Denial of Service via Desktop Dimensions
CVE-2026-91958 6.6 MEDIUM FreeRDP 3.11.0 through 3.30.0 Heap Buffer Overflow via Monitor Index
CVE-2026-91960 6.5 MEDIUM FreeRDP before 3.31.0 Integer Overflow Double Free
CVE-2026-91945 6.5 MEDIUM FreeRDP before 3.31.0 Out-of-bounds Read via Smartcard ATR
CVE-2026-91952 6.5 MEDIUM FreeRDP before 3.31.0 Denial of Service via pool_decode_rect
CVE-2026-91959 6.5 MEDIUM FreeRDP before 3.31.0 Buffer Over-read via RTS Gateway
CVE-2026-91954 6.5 MEDIUM FreeRDP before 3.31.0 NULL Pointer Dereference via NSCodec
CVE-2026-91963 6.5 MEDIUM FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure via urbdrc
CVE-2026-91961 6.5 MEDIUM FreeRDP before 3.31.0 Denial of Service via URBDRC
CVE-2026-91953 6.5 MEDIUM FreeRDP before 3.31.0 Heap Buffer Overflow via LB_LOAD_BALANCE_INFO
CVE-2026-91950 6.5 MEDIUM FreeRDP before 3.31.0 Out-of-Bounds Read via UINT32 Wraparound
CVE-2026-91951 6.5 MEDIUM FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrc
CVE-2026-91956 6.5 MEDIUM FreeRDP before 3.31.0 Out-of-Bounds Read via URBDRC
CVE-2026-91962 6.3 MEDIUM FreeRDP before 3.31.0 Integer Overflow via audin Apple backends
CVE-2026-91957 3.1 LOW FreeRDP before 3.31.0 Use-After-Free via smartcard worker

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-908

V. Comments for CVE-2026-91946

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