CVE-2026-114128

Astro is a web framework for content-driven websites. Prior to 7.3.2, Astro's JSX and MDX rendering pipeline treats string children of script and style elements as trusted HTML without distinguishing compiler-generated literal content from dynamic expression values. An application that passes attacker-controlled data directly as a dynamic child can allow a value containing a closing script or style tag to terminate the element and inject arbitrary HTML and JavaScript. Other JSX expression contexts escape dynamic strings automatically; the issue is limited to script and style children rendered through the astro:jsx renderer, including MDX components. Successful exploitation can produce reflected or stored cross-site scripting under the application's origin. This issue is fixed in 7.3.2.

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2026-10-21

Modified

2026-10-23

Record from

the NVD, synced 2026-10-23

Packages (OSV)

References

• https://github.com/withastro/astro/commit/a548223607b9bb146d5d90ddda495343f9a2a739
• https://github.com/withastro/astro/pull/17896
• https://github.com/withastro/astro/releases/tag/astro@7.3.2
• https://github.com/withastro/astro/security/advisories/GHSA-98hj-9722-w3j8

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