CVE-2026-118173— MISP Guard 标签验证绕过漏洞
一分钟漏洞结论
影响对象
MISP misp-guard
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
MISP Guard 是一款用于在 MISP 情报源数据上实施安全策略的代理组件，其存在对必需分类法标签（taxonomy tags）的验证检查不完整的问题。当情报源事件或其属性携带属于必需分类法（例如 TLP）的标签时，该代理仅验证是否至少有一个标签与配置允许的标签列表匹配，而未验证该事件或属性上存在的所有属于该必需分类法的标签是否均包含在允许列表中。因此，一个事件或属性可能同时携带允许标签（如 ）和未允许标签（如 或 ），仍能通过 MISP Guard 的策略检查。这导致被标记为更高密级或更高敏感度的数据，能够
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| MISP | misp-guard | < 1.4 |
affected |
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一、 漏洞 CVE-2026-118173 基础信息
漏洞信息
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Vulnerability Title
MISP Guard Incomplete Tag Validation Allows Non-Allowed Taxonomy Tags to Bypass Feed Policy Enforcement
来源: CVE Program / CVE List V5
Vulnerability Description
MISP Guard, a proxy that enforces security policies on MISP feed data, contained an incomplete validation check for required taxonomy tags. When a feed event or its attributes carried tags belonging to a required taxonomy (for example, TLP), the guard only verified that at least one tag of that taxonomy matched the configured allowed list. It did not verify that every tag of the required taxonomy present on the event or attribute was in the allowed list. As a result, an event or attribute could simultaneously carry an allowed tag (e.g., tlp:clear) and a non-allowed tag (e.g., tlp:red or tlp:amber) and still pass the guard's policy check. This allowed data marked with a higher classification or sensitivity level to be distributed through feeds configured to only distribute lower-classification data, effectively bypassing the intended data-handling restrictions. The vulnerability affected both event-level and attribute-level tag validation, including attributes nested within objects and shadow attributes. An attacker with the ability to author or modify MISP events in a feed source could include non-allowed taxonomy tags alongside allowed ones to exfiltrate more sensitive data to feed consumers than the guard policy intended to permit.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| MISP | misp-guard | 0 ~ 1.4 |
cpe:2.3:a:misp:misp-guard:*:*:*:*:*:*:*:*
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二、漏洞 CVE-2026-118173 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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