Heap memory corruption via out-of-bounds four-byte write
Published Apr 4, 2025 · Updated Apr 7, 2025
Heap buffer overflow in c-blosc2 2.17.0 and earlier allows attackers to corrupt memory by compressing a crafted chunk. The _sw32 helper performs a four-byte store that crosses the end of a 34-byte heap allocation in the serial_blosc compression path. Exploitation requires low privileges and user interaction; the public reproducer demonstrates an AddressSanitizer-detected memory violation, while no code execution is established.
Summary
What happened
Heap buffer overflow in c-blosc2 2.17.0 and earlier allows attackers to corrupt memory by compressing a crafted chunk. The _sw32 helper performs a four-byte store that crosses the end of a 34-byte heap allocation in the serial_blosc compression path. Exploitation requires low privileges and user interaction; the public reproducer demonstrates an AddressSanitizer-detected memory violation, while no code execution is established.
The record
- CVE
- CVE-2025-29476
- Published
- Apr 4, 2025
- Updated
- Apr 7, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 4, 2025CVE publishedPublication date reported by the CVE source.
- Apr 7, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- OSS-Fuzz compress_chunk_fuzzer crash reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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