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CVE-2026-91964— FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken

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 版本低于 3.31.0 在 函数中处理包含攻击者可控 字段的服务器重定向 PDU 消息时，存在基于堆的缓冲区溢出漏洞。恶意 RDP 服务器可通过发送任意长度的字段并将其写入一个固定大小的 512 字节缓冲区而缺乏校验，从而触发该溢出，可能导致客户端崩溃，或在与内存信息泄露漏洞结合时，进一步引发潜在的可执行代码执行。

CVSS 8.8 · High

Affected Version Matrix 5

VendorProduct Version RangeStatus
FreeRDP FreeRDP 2.0.0< 3.0.0 affected
3.0.0< 3.31.0 affected
3.31.0 unaffected
< 3.31.0 affected
3.31.0 unaffected
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I. Basic Information for CVE-2026-91964

Vulnerability Information
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Vulnerability Title
FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 2.0.0 ~ 3.0.0 -
FreeRDP FreeRDP 0 ~ 3.31.0 -

II. Public POCs for CVE-2026-91964

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III. Intelligence Information for CVE-2026-91964

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Vendor Advisories for CVE-2026-91964 (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-2026-91955 7.5 HIGH FreeRDP before 3.31.0 Denial of Service via Desktop Dimensions
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-2026-91958 6.6 MEDIUM FreeRDP 3.11.0 through 3.30.0 Heap Buffer Overflow via Monitor Index
CVE-2026-91954 6.5 MEDIUM FreeRDP before 3.31.0 NULL Pointer Dereference via NSCodec
CVE-2026-91956 6.5 MEDIUM FreeRDP before 3.31.0 Out-of-Bounds Read via URBDRC
CVE-2026-91951 6.5 MEDIUM FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrc
CVE-2026-91946 6.5 MEDIUM FreeRDP before 3.31.0 Information Disclosure via RDPGFX ResetGraphics
CVE-2026-91953 6.5 MEDIUM FreeRDP before 3.31.0 Heap Buffer Overflow via LB_LOAD_BALANCE_INFO
CVE-2026-91961 6.5 MEDIUM FreeRDP before 3.31.0 Denial of Service via URBDRC
CVE-2026-91963 6.5 MEDIUM FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure via urbdrc
CVE-2026-91952 6.5 MEDIUM FreeRDP before 3.31.0 Denial of Service via pool_decode_rect
CVE-2026-91945 6.5 MEDIUM FreeRDP before 3.31.0 Out-of-bounds Read via Smartcard ATR
CVE-2026-91960 6.5 MEDIUM FreeRDP before 3.31.0 Integer Overflow Double Free
CVE-2026-91959 6.5 MEDIUM FreeRDP before 3.31.0 Buffer Over-read via RTS Gateway
CVE-2026-91950 6.5 MEDIUM FreeRDP before 3.31.0 Out-of-Bounds Read via UINT32 Wraparound
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-122

V. Comments for CVE-2026-91964

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