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CVE-2026-92709— Rsyslog: DynFile Path Traversal → Arbitrary File Write as Root → RCE

Quick assessment

Affected
rsyslog rsyslog
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.

Rsyslog 是一个高速的日志处理系统。在版本 1.15.0 至 8.2610.0 之间，Rsyslog 的 模块中的 功能有意允许模板生成灵活的路径输出，以支持将日志路由到不同目录或使用动态生成的文件名的合法部署场景。然而，当 模板使用受不可信输入影响的路径组件，且未显式进行安全路径处理时，该部署将变得不安全。在此配置下，渲染后的路径可能逃逸出管理员预期的日志目录。此问题不仅限于 RFC5424 中的 HOSTNAME 字段；任何能够传入 路径组件的不可信值都可能触发该条件。截至本公告发布时，尚无公开的修复补丁

CVSS 8.1 · High
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I. Basic Information for CVE-2026-92709

Vulnerability Information
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Vulnerability Title
Rsyslog: DynFile Path Traversal → Arbitrary File Write as Root → RCE
Source: CVE Program / CVE List V5
Vulnerability Description
Rsyslog is a rocket-fast system for log processing. From versions 1.15.0 to 8.2610.0, rsyslog's omfile dynaFile facility intentionally allows templates to generate flexible output paths. This supports valid deployments that route logs into different directories or use dynamically generated file names. A deployment becomes unsafe when a dynaFile template uses a value influenced by untrusted input as a path component without explicit secure-path handling. In that configuration, the rendered path can escape the operator's intended log directory. This is not limited to the RFC5424 HOSTNAME field. Any untrusted value that reaches a dynaFile path component can create the condition. At time of publication, there are no publicly available patches.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rsyslog rsyslog >= 1.15.0, <= 8.2610.0 -

II. Public POCs for CVE-2026-92709

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III. Intelligence Information for CVE-2026-92709

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Other References for CVE-2026-92709 (1)

IV. Related Vulnerabilities

Same product: rsyslog
Same vendor: rsyslog
Same weakness: CWE-22

V. Comments for CVE-2026-92709

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