Out-of-bounds read via zero-length line buffer
Published Aug 25, 2026 · Updated Aug 25, 2026
Stack-buffer underflow in aria2 1.37.0 and earlier allows local users to trigger an out-of-bounds read via an input-list file. IOFile::getLine subtracts one from strlen(buf) without checking for zero, causing an empty C string to dereference buf[-1]. Exploitation requires aria2c to process a crafted input-list file; the published proof aborts under AddressSanitizer, while other consequences are not established.
Summary
What happened
Stack-buffer underflow in aria2 1.37.0 and earlier allows local users to trigger an out-of-bounds read via an input-list file. IOFile::getLine subtracts one from strlen(buf) without checking for zero, causing an empty C string to dereference buf[-1]. Exploitation requires aria2c to process a crafted input-list file; the published proof aborts under AddressSanitizer, while other consequences are not established.
The record
- CVE
- CVE-2026-75421
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- T1204.002
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 25, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- poc1.zipproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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