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CVE-2009-1955 is an XML entity-expansion denial-of-service vulnerability in the Expat parser exposed through Apache APR-util's apr_xml interface before version 1.3.7. Apache HTTP Server deployments using mod_dav or mod_dav_svn can parse attacker-controlled XML containing a large number of nested DTD entity references. Insufficient restriction of recursive entity expansion permits a small XML document to expand excessively in memory, constituting an XML bomb (Billion Laughs-style) condition.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in the expat XML parser used by Apache APR-util's apr_xml_* interface, exploitable via crafted XML with many nested entity references, causing memory consumption.
An XML bomb vulnerability in a web server module, cited as an observed example related to CWE-409 data amplification.
An XML bomb vulnerability in a web server module, cited as an observed example related to CWE-409.
An XML bomb vulnerability in a web-server module that may permit denial of service through recursive XML entity expansion.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.