Arbitrary file overwrite via predictable symlink temp path
Published Jun 10, 2026 · Updated Jun 10, 2026
File overwrite in bit7z before 4.0.12 allows local users to overwrite arbitrary files during in-place archive updates. BitOutputArchive::compressToFile appends .tmp to the archive path, and CFileOutStream opens that predictable path with truncation while following symlinks. Exploitation requires write access to the archive directory and a later update by a process able to write the target; compressed formats corrupt the target, while TAR permits parser-accepted content injection.
Summary
What happened
File overwrite in bit7z before 4.0.12 allows local users to overwrite arbitrary files during in-place archive updates. BitOutputArchive::compressToFile appends .tmp to the archive path, and CFileOutStream opens that predictable path with truncation while following symlinks. Exploitation requires write access to the archive directory and a later update by a process able to write the target; compressed formats corrupt the target, while TAR permits parser-accepted content injection.
The record
- CVE
- CVE-2026-45384
- Published
- Jun 10, 2026
- Updated
- Jun 10, 2026
- Vendor
- Riccardo Ostani
- Product
- bit7z
- Classifications
- CWE-377, CWE-59, T1098.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 10, 2026CVE publishedPublication date reported by the CVE source.
- Jun 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.0.12
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-wjch-42rm-q53h proof of conceptfunctional · validated
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Technologies
Your stack
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Your stack
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