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Title
FreeRDP缓冲区溢出漏洞（CNVD-2026-12777）
Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。
FreeRDP存在缓冲区溢出漏洞，该漏洞源于GDI表面管道中未验证目标矩形边界，攻击者可利用该漏洞导致堆缓冲区溢出。
Severity
高
Patch Name
FreeRDP缓冲区溢出漏洞（CNVD-2026-12777）的补丁
Patch Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。
FreeRDP存在缓冲区溢出漏洞，该漏洞源于GDI表面管道中未验证目标矩形边界，攻击者可利用该漏洞导致堆缓冲区溢出。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。
Formal description
目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://www.freerdp.com/
Reference
https://nvd.nist.gov/vuln/detail/CVE-2026-26955
Impacted products
| Name | FreeRDP FreeRDP <3.23.0 |
|---|
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CVE-2026-26955 (GCVE-0-2026-26955)
Vulnerability from cvelistv5 – Published: 2026-02-25 20:47 – Updated: 2026-06-30 03:19
VLAI
EPSS
Title
FreeRDP has Out-of-bounds Write
Summary
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, a malicious RDP server can trigger a heap buffer overflow in FreeRDP clients using the GDI surface pipeline (e.g., `xfreerdp`) by sending an RDPGFX ClearCodec surface command with an out-of-bounds destination rectangle. The `gdi_SurfaceCommand_ClearCodec()` handler does not call `is_within_surface()` to validate the command rectangle against the destination surface dimensions, allowing attacker-controlled `cmd->left`/`cmd->top` (and subcodec rectangle offsets) to reach image copy routines that write into `surface->data` without bounds enforcement. The OOB write corrupts an adjacent `gdiGfxSurface` struct's `codecs*` pointer with attacker-controlled pixel data, and corruption of `codecs*` is sufficient to reach an indirect function pointer call (`NSC_CONTEXT.decode` at `nsc.c:500`) on a subsequent codec command — full instruction pointer (RIP) control demonstrated in exploitability harness. Users should upgrade to version 3.23.0 to receive a patch.
Severity
8.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
19 references
Impacted products
26 products
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],
"source": {
"advisory": "GHSA-mr6w-ch7c-mqqj",
"discovery": "UNKNOWN"
},
"title": "FreeRDP has Out-of-bounds Write"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-26955",
"datePublished": "2026-02-25T20:47:14.660Z",
"dateReserved": "2026-02-16T22:20:28.611Z",
"dateUpdated": "2026-06-30T03:19:59.119Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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