# CVE-2026-126364: Astro: Image endpoint in @astrojs/node can read files from a case-variant sibling of the output directory on case-sensitive filesystems

Status: published. Published: 2026-11-12. Updated: 2026-11-12.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- withastro / astro: >= 5.14.3, < 7.4.7 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); 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; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-22, CWE-178

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/withastro/astro/security/advisories/GHSA-r3h5-4585-7x3w (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/withastro/astro/commit/7da442bb286e0c29e1c9e1add6727b7cbf434f1a (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/withastro/astro/releases/tag/astro@7.4.7 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-126364; retrieved 2026-11-12; source updated 2026-11-12

Revision: c31de361765ee4077e97b7c5b2840a0c5cd51e581af8f3a790e3ac690e3106cd

Canonical: https://y2.dev/cve/CVE-2026-126364

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