Process crash via truncated SQLAR allocation
Published Aug 25, 2026 · Updated Aug 25, 2026
Heap buffer overflow in SQLite SQLAR source snapshots allows attackers to crash the host process through a crafted function call. In sqlarUncompressFunc(), sqlite3_value_int64() supplies a 64-bit size that sqlite3_malloc(int) truncates while zlib uncompress() retains the full value and writes past the undersized heap allocation. Exploitation requires the optional SQLAR extension, attacker-controlled sqlar_uncompress() arguments, and LP64 type widths; the demonstrated result is a process abort, not code execution.
Summary
What happened
Heap buffer overflow in SQLite SQLAR source snapshots allows attackers to crash the host process through a crafted function call. In sqlarUncompressFunc(), sqlite3_value_int64() supplies a 64-bit size that sqlite3_malloc(int) truncates while zlib uncompress() retains the full value and writes past the undersized heap allocation. Exploitation requires the optional SQLAR extension, attacker-controlled sqlar_uncompress() arguments, and LP64 type widths; the demonstrated result is a process abort, not code execution.
The record
- CVE
- CVE-2026-39113
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- T1499.004
- Attack vector
- Unavailable
- Privileges
- Unavailable
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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What is affected?
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Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- SQLite SQLAR heap-buffer-overflow reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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