Local memory disclosure via malformed changeset varint
Published Jul 8, 2026 · Updated Jul 8, 2026
Buffer over-read in the SQLite Session Extension 3.53.1 allows local users to disclose adjacent memory via a malformed changeset blob. sessionVarintGet() accepted a high-bit TEXT length from the blob without clearing the high bit, so the merge path read beyond the caller-supplied buffer and copied adjacent bytes into output. Reachability requires an application with the Session Extension enabled to pass the blob to sqlite3changeset_concat() or sqlite3changegroup_add(); the demonstrated leak is four bytes, with no write or code execution.
Summary
What happened
Buffer over-read in the SQLite Session Extension 3.53.1 allows local users to disclose adjacent memory via a malformed changeset blob. sessionVarintGet() accepted a high-bit TEXT length from the blob without clearing the high bit, so the merge path read beyond the caller-supplied buffer and copied adjacent bytes into output. Reachability requires an application with the Session Extension enabled to pass the blob to sqlite3changeset_concat() or sqlite3changegroup_add(); the demonstrated leak is four bytes, with no write or code execution.
The record
- CVE
- CVE-2026-50813
- Published
- Jul 8, 2026
- Updated
- Jul 8, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-126, T1005
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 8, 2026CVE publishedPublication date reported by the CVE source.
- Jul 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
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.
Public exploit references
- Malformed changeset memory-disclosure proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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