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PHP 4 contains an integer-overflow flaw in its 16-bit variable reference counter. An attacker able to drive the reference count past its representable range can cause incorrect reference-count handling, resulting in destruction of the same variable twice. The resulting memory-lifetime corruption can be leveraged for arbitrary code execution in context-dependent circumstances.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability example in which integer overflow in a reference counter leads to double destruction of a variable.
An integer overflow in a reference counter that can cause double destruction of a variable.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.