Service crash via malformed Redis bulk response
Published Aug 6, 2026 · Updated Aug 6, 2026
Heap-based buffer overflow in the APR redis client in Apache Portable Runtime Utility 1.6.0 through 1.6.3 allows attackers to crash applications. The grab_bulk_resp function accepts a Redis bulk-string length below two, subtracts two from it, and writes a terminator through the resulting out-of-bounds index. Exploitation requires control of the queried Redis server or a man-in-the-middle position; the observed consequence is an application crash, not code execution.
Summary
What happened
Heap-based buffer overflow in the APR redis client in Apache Portable Runtime Utility 1.6.0 through 1.6.3 allows attackers to crash applications. The grab_bulk_resp function accepts a Redis bulk-string length below two, subtracts two from it, and writes a terminator through the resulting out-of-bounds index. Exploitation requires control of the queried Redis server or a man-in-the-middle position; the observed consequence is an application crash, not code execution.
The record
- CVE
- CVE-2026-34501
- Published
- Aug 6, 2026
- Updated
- Aug 6, 2026
- Vendor
- The Apache Software Foundation
- Product
- Apache Portable Runtime Utility
- Classifications
- CWE-122, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 6, 2026CVE publishedPublication date reported by the CVE source.
- Aug 6, 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=1.6.0 <=1.6.3
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
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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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