Executive Summary

CVE-2026-11822 is a memory corruption vulnerability in SQLite versions before 3.53.2, specifically in the FTS5 full-text search extension.

The vulnerability arises when attackers supply a crafted database containing malformed FTS5 page data, which triggers an out-of-bounds read in the fts5LeafSeek() function and a heap buffer overflow write in fts5ChunkIterate() due to an integer underflow.

This can be exploited when an FTS5 MATCH query is executed against the malicious database, potentially leading to process crashes, memory exhaustion, or arbitrary code execution.

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Impact Analysis

If exploited, this vulnerability can cause serious impacts including process crashes, memory exhaustion, and arbitrary code execution on systems using vulnerable SQLite versions.

This means an attacker could potentially crash applications relying on SQLite or execute malicious code, compromising system stability and security.

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Detection Guidance

Detection of this vulnerability involves identifying corrupt database records in the FTS5 extension of SQLite. A new test case named fts5corruptA.test was added to SQLite's test suite to detect such corrupt records.

While no specific network or system commands are provided in the resources, running the SQLite test suite including the fts5corruptA.test can help detect the presence of malformed FTS5 page data that triggers the vulnerability.

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Mitigation Strategies

The primary mitigation step is to upgrade SQLite to version 3.53.2 or later, where the vulnerability has been fixed.

Avoid using vulnerable versions of SQLite (versions before 3.53.2) especially when processing databases that use the FTS5 full-text search extension.

If upgrading immediately is not possible, restrict access to databases using FTS5 to trusted users and avoid executing FTS5 MATCH queries on untrusted or potentially malicious databases.

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