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CVE-2026-56812— phoenixframework phoenix 异常处理不当漏洞

一分钟漏洞结论

影响对象
phoenixframework phoenix
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。

phoenixframework phoenix是phoenixframework团队开源的一款Web开发框架。 phoenixframework phoenix 1.2.0-rc.0版本至1.5.15之前版本、1.6.0-rc.0版本至1.6.17之前版本、1.7.0-rc.0版本至1.7.24之前版本和1.8.0-rc.0版本至1.8.9之前版本存在异常处理不当漏洞，该漏洞源于对程序文件assets/js/phoenix/presence.js以及程序例程Presence.syncState和Pres

CVSS 6.3 · Medium EPSS 0.80% · P55

可能的 ATT&CK 技术 1 AI

T1429

影响版本矩阵 9

厂商产品 版本范围状态
phoenixframework phoenix 1.2.0-rc.0< 1.5.15 affected
1.6.0-rc.0< 1.6.17 affected
1.7.0-rc.0< 1.7.24 affected
1.8.0-rc.0< 1.8.9 affected
1.2.0-rc.0< 1.5.15 affected
1.6.0-rc.0< 1.6.17 affected
1.7.0-rc.0< 1.7.24 affected
1.8.0-rc.0< 1.8.9 affected
… +1 条更多
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一、 漏洞 CVE-2026-56812 基础信息

漏洞信息
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Vulnerability Title
Phoenix JavaScript presence client crashes on presence keys colliding with Object.prototype members in Presence.syncState/syncDiff
来源: CVE Program / CVE List V5
Vulnerability Description
Improper Check for Unusual or Exceptional Conditions vulnerability in phoenixframework phoenix (Presence JavaScript client) allows an attacker with ordinary channel access to cause a persistent client-side denial of service against every viewer of a presence channel topic. This vulnerability is associated with program files assets/js/phoenix/presence.js and program routines Presence.syncState and Presence.syncDiff. The Phoenix JavaScript presence client checks whether a presence already exists with a bare truthiness test (state[key]) instead of an own-property check. Presence keys can be attacker-controlled, because applications track presences under a username or id supplied by the client. A user who joins a channel choosing a key that is an Object.prototype member name (__proto__, constructor, toString, hasOwnProperty, and similar) makes that lookup return JavaScript's built-in Object.prototype instead of undefined. Because the prototype is truthy, the code treats it as an existing presence and reads .metas.map(...) off it, which throws an uncaught TypeError. The exception propagates out of the presence message handler, so the local state is never updated and onSync() never fires. Because the malicious key is tracked on the server, it is re-pushed on every presence update and keeps re-throwing, so presence sync stays broken for every viewer of that channel topic until the attacker leaves. Both syncState and syncDiff use the same unsafe existence-check pattern. The impact is limited to the affected topic and is a read-time confusion of the prototype object, not a mutation of Object.prototype (it is not prototype pollution). This issue affects phoenix: from 1.2.0-rc.0 before 1.5.15, from 1.6.0-rc.0 before 1.6.17, from 1.7.0-rc.0 before 1.7.24, and from 1.8.0-rc.0 before 1.8.9; phoenix: from 1.2.0-rc.0 before 1.5.15, from 1.6.0-rc.0 before 1.6.17, from 1.7.0-rc.0 before 1.7.24, and from 1.8.0-rc.0 before 1.8.9.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
来源: CVE Program / CVE List V5
Vulnerability Title
phoenixframework phoenix 异常处理不当漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
phoenixframework phoenix是phoenixframework团队开源的一款Web开发框架。 phoenixframework phoenix 1.2.0-rc.0版本至1.5.15之前版本、1.6.0-rc.0版本至1.6.17之前版本、1.7.0-rc.0版本至1.7.24之前版本和1.8.0-rc.0版本至1.8.9之前版本存在异常处理不当漏洞，该漏洞源于对程序文件assets/js/phoenix/presence.js以及程序例程Presence.syncState和Pres
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
phoenixframework phoenix 1.2.0-rc.0 ~ 1.5.15 cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*
phoenixframework phoenix 1.2.0-rc.0 ~ 1.5.15 cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*
phoenixframework phoenix 2270aaf21bd02c6a6a1022820564efb605a97655 ~ * cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*

二、漏洞 CVE-2026-56812 的公开POC

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三、漏洞 CVE-2026-56812 的情报信息

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CVE-2026-56812 补丁与修复 (4)

CVE-2026-56812 厂商安全公告 (3)

IV. Related Vulnerabilities

Same product: phoenix
Same vendor: phoenixframework
Same weakness: CWE-754

V. Comments for CVE-2026-56812

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