CVE-2026-61725
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In sevenz-rust2 before 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.
Risk Assessment
Applications that automatically unpack uploaded or otherwise untrusted archives may allow an attacker to write files outside the destination directory, potentially leading to code execution or persistence. The archive bytes are the attacker-controlled trust boundary.
Recommendation
Upgrade sevenz-rust2 to version 0.21.1 or later. Avoid automatically unpacking untrusted archives without additional path validation.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS