CVE-2026-49289 (GCVE-0-2026-49289)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:48 – Updated: 2026-08-19 18:04
VLAI
Title
SimpleSAMLphp SAML2: Possible DoS via XPath Transform
Summary
The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. In 4.19.2 and 4.20.2, the library permits attacker-controlled XPath transforms while processing XML signatures in specially crafted SAML messages. XPath evaluation can consume uncontrolled processing resources, allowing a remote unauthenticated attacker to deny service to any entity relying on SimpleSAMLphp or directly on the SAML2 library. The mitigation limits the number of transforms, permits only transform algorithms identified by the SAML 2.0 Core specification, and specifically rejects XPath transforms. This issue is fixed in versions 4.19.3 and 4.20.3.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 18:04 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Impacted products
Vendor Product Version CPE status
simplesamlphp saml2 Affected: >= 4.19.2, < 4.19.3
Affected: >= 4.20.2, < 4.20.3
guessed Create a notification for this product.
Show details on NVD website

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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