PHP Advisory Flags Unpatched RCE Risk in Rare Session Serialization Configurations

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The PHP project has issued an advance advisory, tracked as CVE-2026-115560, describing a remote code execution risk with no patch available yet. The issue arises only in a narrow setup where the session serialize handler starts as php_binary or php_serialize, is switched to php at runtime, and session upload progress remains enabled. Organizations are urged to review their configurations and application code and to disable upload progress as a temporary mitigation. The full technical advisory is expected in a future regular release, and no real-world exploitation has been reported so far. Potential impact includes execution of arbitrary code with the privileges of the PHP process.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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