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CVE-2026-59729

CVE-2026-59729 · Astro: XSS via unescaped spread attribute names in renderHTMLElement (incomplete fix for CVE-2026-54298)

Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.

Astro is a web framework for content-driven websites. Versions prior to 7.0.6 are vulnerable to XSS through unescaped spread attribute names in renderHTMLElement. The fix for CVE-2026-54298 (GHSA-jrpj-wcv7-9fh9) added an INVALID_ATTR_NAME_CHAR guard to addAttribute() so that spread-prop attribute names containing "' >/= or whitespace are dropped. A second attribute-rendering path, renderHTMLElement() in packages/astro/src/runtime/server/render/dom.ts, has its own inline attribute loop that does not go through addAttribute() and was not updated. It interpolates the attribute name unescaped and only escapes the value, so untrusted prop keys spread onto a native-HTMLElement-subclass component can still break out of the attribute context. This issue has been fixed in version 7.0.6.

CVSS 5.1 · Media · EPSS 0,5% · Corrección disponible

Publicación
Actualización

Pila tecnológica: node

Productos y versiones afectados

  • astro

    Versiones
    • < 7.0.6: Afectada

    Sin corrección publicada

  • astro npm

    Intervalos de versiones afectados
    • SEMVER: < 7.0.6

    Actualiza a 7.0.6

Fuentes originales

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