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CVE-2026-61725— sevenz-rust2: unchecked 7z entry paths permit traversal and absolute-path file overwrites

Quick assessment

Affected
hasenbanck sevenz-rust2
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.

sevenz-rust2 是一款原生用 Rust 编写的 7z 压缩与解压工具。在 0.21.1 版本之前，解压由攻击者提供的 7z 归档文件时，可能导致文件被写入或覆盖到目标目录之外。在 中， 函数通过 计算每个目标路径，但未对归档中 UTF-16 编码的条目名称进行规范化，也未验证其是否包含在目标目录内；随后 使用 向该路径写入文件。若条目名称包含父目录组件（如 ），则会逃逸出解压根目录；若条目使用绝对路径，则 操作会完全忽略指定的目标目录。便捷入口函数 、 、 和 均使用此默认路径处理逻辑。攻击者通过覆盖可写

CVSS 6.1 · Medium
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I. Basic Information for CVE-2026-61725

Vulnerability Information
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Vulnerability Title
sevenz-rust2: unchecked 7z entry paths permit traversal and absolute-path file overwrites
Source: CVE Program / CVE List V5
Vulnerability Description
sevenz-rust2 is a Rust-native 7z compressor and `decompress`or. Prior to 0.21.1, extracting an attacker-supplied 7z archive can write or overwrite files outside the destination directory. In `src/util/decompress.rs`, `decompress_impl` computes each destination with `dest.join(entry.name())` without normalizing the archive's UTF-16 entry name or verifying containment, and `default_entry_extract_fn` writes to it with `File::create`. Parent-directory components escape the extraction root, and an absolute entry path makes the join discard the destination entirely. The convenience entry points `decompress`, `decompress_file`, `decompress_with_password`, and `decompress_file_with_password` all use this default path. Overwriting writable configuration, startup, cron, or build files can lead to code execution or persistence. The archive bytes are the attacker-controlled trust boundary, including for applications that automatically unpack uploaded or otherwise untrusted archives. This issue is fixed in version 0.21.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L
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
hasenbanck sevenz-rust2 < 0.21.1 -

II. Public POCs for CVE-2026-61725

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III. Intelligence Information for CVE-2026-61725

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Other References for CVE-2026-61725 (2)

IV. Related Vulnerabilities

Same weakness: CWE-22