CVE-2026-39245— kevva decompress 安全漏洞

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decompress before 4.2.2 contains an improper path containment check that enables directory traversal and arbitrary file write. The safeMakeDir function (index.js line 29) and the extraction path validation (index.js line 106) use String.indexOf() to verify the resolved path is within the output directory: realDestinationDir.indexOf(realOutputPath) !== 0. This check is flawed because it does not enforce a path separator boundary. For example, "/tmp/app_config".indexOf("/tmp/app") returns 0, incorrectly passing the check even though /tmp/app_config is outside /tmp/app. Combined with the unvalidated symlink creation in the same package, an attacker can write arbitrary files to directories adjacent to the extraction target. This is a bypass of the fix for CVE-2020-12265. The correct check requires appending a path separator: realParentPath.indexOf(realOutputPath + path.sep) !== 0.

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kevva decompress 安全漏洞

个人开发者 decompress是个人开发者个人开发者的一个文件解压缩工具。 kevva decompress 4.2.2之前版本存在路径遍历漏洞，该漏洞源于safeMakeDir函数和提取路径验证使用String.indexOf()未能正确执行路径分隔符边界检查，可能导致目录遍历攻击和任意文件写入。

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