Authenticated code execution via sparse run-length overflow
Published Jul 7, 2025 · Updated Feb 4, 2026
Integer overflow in Redis HyperLogLog processing allows attackers to execute code through a malformed sparse encoding. In hllMerge, hllSparseToDense, and hllSparseRegHisto, unchecked run lengths overflow a signed index and drive writes before stack- or heap-resident register arrays. An authenticated account able to store crafted strings and invoke HyperLogLog operations can corrupt server memory, crash the process, or gain code execution.
Summary
What happened
Integer overflow in Redis HyperLogLog processing allows attackers to execute code through a malformed sparse encoding. In hllMerge, hllSparseToDense, and hllSparseRegHisto, unchecked run lengths overflow a signed index and drive writes before stack- or heap-resident register arrays. An authenticated account able to store crafted strings and invoke HyperLogLog operations can corrupt server memory, crash the process, or gain code execution.
The record
- CVE
- CVE-2025-32023
- Published
- Jul 7, 2025
- Updated
- Feb 4, 2026
- Vendor
- Redis
- Product
- Redis
- Classifications
- CWE-680, T1210
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 7, 2025CVE publishedPublication date reported by the CVE source.
- Feb 4, 2026Record 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=>= 2.8.0, < 6.2.19
- Affected versionversion=>= 7.0.0, < 7.2.10
- Affected versionversion=>= 7.4-rc1, < 7.4.5
- Affected versionversion=>= 8.0.0, < 8.0.3
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
- PlaidCTF Zerodeo PoC and exploitfunctional · demonstrated
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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