@astrojs/netlify generates an overly-broad Netlify Image CDN allowlist because remotePatterns.pathname metacharacters are not escaped

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-73425: 0.27% estimated exploitation activity in the next 30 days; percentile 19.15 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The @astrojs/netlify adapter converts each image.remotePatterns entry into a regular expression that is written to .netlify/v1/config.json under images.remoteimages. Netlify's Image CDN uses these regexes as the allowlist that decides which remote image URLs it will optimize. remotePatternToRegex() escapes . in the hostname but interpolates the literal pathname into the regex without escaping regex metacharacters. As a result, the generated allowlist is broader than the pattern the developer declared, and broader than Astro's canonical matchPattern() helper (which compares non-wildcard pathnames by exact string equality). This is a residual of the same bug class addressed in CVE-2026-54300 (PR #17018, commit 1310277d). That fix corrected wildcard semantics and added a $ anchor but did not add metacharacter escaping for literal pathnames. Details In packages/integrations/netlify/src/index.ts, remotePatternToRegex() escapes dots in the hostname: but interpolates the pathname…

Published by the source

20 Jul 2026, 23:24 UTC

Last modified by the source

13 Aug 2026, 15:30 UTC

Source last checked

26 Oct 2026, 13:01 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-hp3v-mfqw-h74c

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-hp3v-mfqw-h74c

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# Patch Next advisory brief: CVE-2026-73425

Advisory: @astrojs/netlify generates an overly-broad Netlify Image CDN allowlist because remotePatterns.pathname metacharacters are not escaped
IDs: CVE-2026-73425, GHSA-hp3v-mfqw-h74c
Record: https://patchnext.com/advisories/cve-2026-73425 (revision 2, source checked 26 Oct 2026, 13:01 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 3.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @astrojs/netlify 8.1.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @astrojs/netlify: affected < 8.1.2; fixed in 8.1.2

## Suggested inspection (read-only)
- `npm ls @astrojs/netlify --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @astrojs/netlify.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-hp3v-mfqw-h74c (OSV record GHSA-hp3v-mfqw-h74c lists affected ranges: npm @astrojs/netlify >=0 <8.1.2 (fixed))
- Verified: https://github.com/advisories/GHSA-hp3v-mfqw-h74c (GitHub-reviewed advisory GHSA-hp3v-mfqw-h74c lists affected ranges: npm @astrojs/netlify >=0 <8.1.2)

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