CVE-2026-50568— Fission 安全漏洞

Fission: SanitizeFilePath lexical HasPrefix bypass permits sibling-directory escape

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, SanitizeFilePath in pkg/utils/utils.go validated that a path stayed under a safe directory by calling strings.HasPrefix(path, safedir). This is a lexical check, not a directory boundary check: /packages-extra/evil starts with /packages, so it passed. The function did not enforce a path-separator boundary, so any sibling directory whose name began with the safe-directory string was accepted. Callers included the builder's Clean handler (pkg/builder/builder.go:208) and the fetcher's Fetch / Upload handlers (pkg/fetcher/fetcher.go). A tenant who could pre-create or control a sibling directory under the fetcher / builder's shared volume could induce a write or read outside the intended safe directory. This issue has been patched in version 1.25.0.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

对路径等价的解析不恰当

Fission 安全漏洞

Fission是Fission开源的一个基于Kubernetes的函数部署框架。 Fission 1.25.0之前版本存在安全漏洞，该漏洞源于SanitizeFilePath函数使用字符串前缀检查而非目录边界检查，导致以安全目录字符串开头的兄弟目录被接受，租户可通过控制fetcher/构建器共享卷下的兄弟目录诱导写入或读取安全目录之外的文件。

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