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.
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Tue, 03 Nov 2026 17:00:00 +0000
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Mon, 02 Nov 2026 15:30:00 +0000
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Fri, 30 Oct 2026 22:15:00 +0000
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| 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. | |
| Title | sevenz-rust2: unchecked 7z entry paths permit traversal and absolute-path file overwrites | |
| Weaknesses | CWE-22 CWE-23 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-10-30T22:10:55.526Z
Updated: 2026-11-02T14:46:18.025Z
Reserved: 2026-07-10T18:59:00.046Z
Link: CVE-2026-61725
Updated: 2026-11-02T14:46:09.759Z
Status : Deferred
Published: 2026-10-30T23:17:11.743
Modified: 2026-11-02T19:35:33.347
Link: CVE-2026-61725
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