Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') Affecting expat package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-EXPAT-21707491
- published25 Oct 2026
- disclosed22 Oct 2026
- creditUnknown
Introduced: 22 Oct 2026
NewCVE-2026-115506 (opens in a new tab)How to fix?
There is no fixed version for expat.
Overview
Affected versions of this package are vulnerable to Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') due to delayed detection in the accountingDiffTolerated function. An attacker can exhaust system resources by submitting a specially crafted XML document containing a large DTD with deeply nested entity expansions.