Vulnerability in @astrojs/netlify (CVE-2026-73425)
Summary
Vulnerability in @astrojs/netlify (CVE-2026-73425). Risk of unauthorized operations or information disclosure. Exploitable via image.remotePatterns. Mitigation: upgrade to 8.1.2 or later.
Original description
The description as published by the source.
Summary
The @astrojs/netlify adapter converts each image.remotePatterns entry into a regular expression that is written to .netlify/v1/config.json under images.remote_images. 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:
regexStr += hostname.replace(/\./g, '\\.');
but interpolates the pathname unescaped in all three branches, e.g. the exact-match branch:
regexStr += `(\\${pathname})`;
Any regex metacharacter in the literal path (., +, ?, (, [, ...) is therefore passed through raw. Because . matches any character (including /), a restrictive pattern is silently widened.
The security boundary on Netlify is the generated regex itself — Netlify's Image CDN enforces it dire…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-73425 has been found in @astrojs/netlify.
Attackers can target a specific entry point like image.remotePatterns over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 3.7/10.
What to do: upgrade @astrojs/netlify to 8.1.2 or later.
If unsure, ask your IT team or search "@astrojs/netlify CVE-2026-73425" on the vendor's site.
CVE-2026-73425 (@astrojs/netlify) — CWE-185 / CVSS v3 3.7
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: image.remotePatterns / images.remote_images / pathname / remotePatterns
Patched: 8.1.2 — apply immediately
Workaround: Avoid regex metacharacters (notably .) in image.remotePatterns[].pathname values, or scope the allowed host so that unintended paths are not reachable.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-185) exists in @astrojs/netlify. Attackers reach the vulnerable code path via image.remotePatterns without authentication.
Check the vendor advisory for the affected versions of @astrojs/netlify. Attack surface: image.remotePatterns / images.remote_images / pathname / remotePatterns.
Severity: Low (CVSS 3.7/10). Risk of unauthorized operations or information disclosure.
Update to 8.1.2.
Workaround: Avoid regex metacharacters (notably .) in image.remotePatterns[].pathname values, or scope the allowed host so that unintended paths are not reachable.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@astrojs/netlify' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r '@astrojs/netlify' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
@astrojs/netlifyを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
Avoid regex metacharacters (notably `.`) in `image.remotePatterns[].pathname` values, or scope the allowed host so that unintended paths are not reachable.パッチが適用されるまでの応急処置として、Avoid regex metacharacters (notably
.) inimage.remotePatterns[].pathnamevalues, or scope the allowed host so that unintended paths are not reachable. を実施。回避策の副作用 (機能低下) を確認した上で。 -
3Apply patch patch
Upgrade @astrojs/netlify to 8.1.2ステージング環境で 8.1.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
4Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com