CVE-2009-5016: n/a vulnerability

CVE-2009-5016: Integer overflow in the xml_utf8_decode function in ext/xml/xml.c in PHP before 5.2.11 makes it easier for...

Integer overflow in the xml_utf8_decode function in ext/xml/xml.c in PHP before 5.2.11 makes it easier for remote attackers to bypass cross-site scripting (XSS) and SQL injection protection mechanisms via a crafted string that uses overlong UTF-8 encoding, a different vulnerability than CVE-2010-3870.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 07:24 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2009-5016 is a legacy PHP flaw where specially encoded UTF-8 text could make some defensive checks miss dangerous input. The business risk is highest for old PHP applications that trusted PHP/XML decoding as part of XSS or SQL injection filtering. Exposure is mainly legacy PHP before 5.2.11 or vendor packages lacking the relevant backport. Applications are more exposed if user-controlled XML or UTF-8 input feeds validation, sanitization, or database/browser output paths. Treat as a modernization and legacy exposure issue. It is not presented as actively exploited, but any internet-facing PHP 5.2-era system has broader support and security risk beyond this CVE. Mitigation focus: Upgrade PHP beyond 5.2.11 or apply vendor-supported backported packages.; Review Red Hat, Ubuntu, Fedora, or PHP guidance for package-specific fixes.; Do not rely on UTF-8 decoding alone as an injection defense..

Prepared: Jun 28, 2026, 01:17 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 12, 2010, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

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1Source links

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Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

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