Heap overwrite via unchecked original filename copy
Published Sep 14, 2026 · Updated Sep 14, 2026
Heap-based buffer overflow in libarchive 3.8.0 through 3.8.1 allows context-dependent attackers to overwrite heap memory during gzip writing. archive_compressor_gzip_open uses strcpy to copy the original-filename option into a heap buffer without checking the destination size. Reachability requires a caller to supply an attacker-controlled original filename; archive input does not populate that option, so ordinary extraction is unaffected.
Summary
What happened
Heap-based buffer overflow in libarchive 3.8.0 through 3.8.1 allows context-dependent attackers to overwrite heap memory during gzip writing. archive_compressor_gzip_open uses strcpy to copy the original-filename option into a heap buffer without checking the destination size. Reachability requires a caller to supply an attacker-controlled original filename; archive input does not populate that option, so ordinary extraction is unaffected.
The record
- CVE
- CVE-2025-64031
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Vendor
- libarchive
- Product
- libarchive
- Classifications
- CWE-122
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 14, 2026CVE publishedPublication date reported by the CVE source.
- Sep 14, 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=3.8.0 <3.8.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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