CVE-2026-126364

Description

Astro is a web framework for content-driven websites. From 5.14.3 until 7.4.7, Astro's /_image endpoint compared the requested local-image path with the build output directory without preserving case on case-sensitive filesystems. A sibling directory whose path differed from the output directory only by letter case could therefore pass the containment check, allowing an unauthenticated requester to read image files accepted by the image service from outside the output directory. Exploitation required on-demand rendering with the @astrojs/node adapter, a case-sensitive filesystem, and a preexisting case-variant sibling directory; ordinary traversal to unrelated paths was already rejected. This issue is fixed in Astro version 7.4.7.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 6.3CVSS 4.0, Mediumfrom the CNA (GitHub_M)CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 12 Nov 2026 Published

Weakness

• CWE-22
• CWE-178

References

• https://github.com/withastro/astro/security/advisories/GHSA-r3h5-4585-7x3wx_refsource_CONFIRM
• https://github.com/withastro/astro/commit/7da442bb286e0c29e1c9e1add6727b7cbf434f1ax_refsource_MISC
• https://github.com/withastro/astro/releases/tag/astro@7.4.7x_refsource_MISC