Process-memory disclosure or crash via Lua delimiter underflow
Published Oct 3, 2025 · Updated Oct 3, 2025
Out-of-bounds read in Redis 8.2.1 and earlier allows remote authenticated users to expose process memory or crash the server via Lua. The bundled Lua lexer's skip_sep function represents a malformed long-string delimiter with a negative separator count that read_long_string uses in buffer offset and length arithmetic. Redis credentials and permission to execute Lua are required; successful exploitation reads adjacent process memory or interrupts the service with a crash.
Summary
What happened
Out-of-bounds read in Redis 8.2.1 and earlier allows remote authenticated users to expose process memory or crash the server via Lua. The bundled Lua lexer's skip_sep function represents a malformed long-string delimiter with a negative separator count that read_long_string uses in buffer offset and length arithmetic. Redis credentials and permission to execute Lua are required; successful exploitation reads adjacent process memory or interrupts the service with a crash.
The record
- CVE
- CVE-2025-46819
- Published
- Oct 3, 2025
- Updated
- Oct 3, 2025
- Vendor
- Redis
- Product
- Redis
- Classifications
- CWE-125, CWE-190, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 3, 2025CVE publishedPublication date reported by the CVE source.
- Oct 3, 2025Record 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=< 8.2.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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