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This occurs in ReadParams in fcgiapp.c.", "A flaw was found in the FCGI library. In affected versions, specially crafted nameLen or valueLen values in data sent to the IPC socket may result in a heap-based buffer overflow, which can cause an application crash or other undefined behavior. This occurs in ReadParams in fcgiapp.c."], "mitigation": {"lang": "en:us", "value": "No mitigation is currently available that meets Red Hat Product Security\u2019s standards for usability, deployment, applicability, or stability."}, "name": "CVE-2025-40907", "public_date": "2025-05-16T13:03:02Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40907\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40907\nhttp://www.openwall.com/lists/oss-security/2025/04/23/4\nhttps://github.com/FastCGI-Archives/fcgi2/issues/67\nhttps://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5\nhttps://github.com/perl-catalyst/FCGI/issues/14\nhttps://patch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patch\nhttps://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library"], "statement": "This vulnerability is Important rather than just a Moderate flaw because it stems from an integer overflow in the allocation size calculation during parameter parsing in the FastCGI implementation. 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