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PhpSpreadsheet (>= 4.0.0, <= 5.8.0)

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medium advisory

PhpSpreadsheet Gnumeric Reader Unbounded Gzip Expansion Leads to Denial of Service

The PhpOffice PhpSpreadsheet library is vulnerable to a denial of service (DoS) attack, identified as CVE-2026-59932, where its Gnumeric reader processes attacker-supplied `.gnumeric` files containing gzipped content without enforcing a decompressed-size limit, causing memory exhaustion and application crashes.

PhpSpreadsheet +4 denial-of-service vulnerability php ghsa software-supply-chain
1t