Authenticated code execution via Lua unpack overflow
Published Oct 3, 2025 · Updated Oct 3, 2025
Integer overflow in Redis before 8.2.2 allows remote authenticated users to execute code through a specially crafted Lua script. The luaB_unpack function uses signed arithmetic to calculate the requested result count before checking stack capacity, and luaH_getnum decrements an attacker-controlled integer key before bounds checking. Access to the EVAL or FUNCTION command families is required; successful exploitation corrupts memory and can crash the server or execute code.
Summary
What happened
Integer overflow in Redis before 8.2.2 allows remote authenticated users to execute code through a specially crafted Lua script. The luaB_unpack function uses signed arithmetic to calculate the requested result count before checking stack capacity, and luaH_getnum decrements an attacker-controlled integer key before bounds checking. Access to the EVAL or FUNCTION command families is required; successful exploitation corrupts memory and can crash the server or execute code.
The record
- CVE
- CVE-2025-46817
- Published
- Oct 3, 2025
- Updated
- Oct 3, 2025
- Vendor
- Redis
- Product
- Redis
- Classifications
- CWE-190, T1190
- 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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Redis Lua unpack integer-overflow proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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