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Astro: Netlify Image CDN allowlist bypass enables SSRF

Type: advisorySources: OSV

Astro is a web framework for content-driven websites. From 5.2.0 until 8.2.4, the @astrojs/netlify adapter generates regular expressions for Netlify Image CDN remote-image allowlists without anchoring them to the beginning of the URL. Because Netlify evaluates these expressions with RegExp.test(), an allowed origin appearing only in a source URL's path or query can satisfy image.domains or image.remotePatterns while the URL's actual host remains attacker-controlled. An unauthenticated request to the public /.netlify/images endpoint can therefore cause the Image CDN to request attacker-selected URLs and may probe or reach internal services. Netlify egress protections may constrain reachable targets, and image transformation limits direct response exfiltration; no confidentiality or integrity impact has been demonstrated. This issue is fixed in version 8.2.4.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-102983
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 16:29 UTC · Revision 1

Source evidence

Astro: Netlify Image CDN allowlist bypass enables SSRF

core-osv · Original source

Published 30 Sept 2026, 14:32 UTC

Astro is a web framework for content-driven websites. From 5.2.0 until 8.2.4, the @astrojs/netlify adapter generates regular expressions for Netlify Image CDN remote-image allowlists without anchoring them to the beginning of the URL. Because Netlify evaluates these expressions with RegExp.test(), an allowed origin appearing only in a source URL's path or query can satisfy image.domains or image.remotePatterns while the URL's actual host remains attacker-controlled. An unauthenticated request to the public /.netlify/images endpoint can therefore cause the Image CDN to request attacker-selected URLs and may probe or reach internal services. Netlify egress protections may constrain reachable targets, and image transformation limits direct response exfiltration; no confidentiality or integrity impact has been demonstrated. This issue is fixed in version 8.2.4.

osv:CVE-2026-102983
Complete source record
{
  "id": "8d9cc2911b3e10fe5021f1c9ccd7c14c50ef7aa0216e68b6c8b89da9d2e1fe63",
  "url": "https://osv.dev/vulnerability/CVE-2026-102983",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Astro: Netlify Image CDN allowlist bypass enables SSRF",
    "summary": "Astro is a web framework for content-driven websites. From 5.2.0 until 8.2.4, the @astrojs/netlify adapter generates regular expressions for Netlify Image CDN remote-image allowlists without anchoring them to the beginning of the URL. Because Netlify evaluates these expressions with RegExp.test(), an allowed origin appearing only in a source URL's path or query can satisfy image.domains or image.remotePatterns while the URL's actual host remains attacker-controlled. An unauthenticated request to the public /.netlify/images endpoint can therefore cause the Image CDN to request attacker-selected URLs and may probe or reach internal services. Netlify egress protections may constrain reachable targets, and image transformation limits direct response exfiltration; no confidentiality or integrity impact has been demonstrated. This issue is fixed in version 8.2.4.",
    "evidence": "osv:CVE-2026-102983",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-102983",
      "aliases": [
        "CVE-2026-102983",
        "GHSA-4233-jc72-56c5"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/withastro/astro",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f7283e07c8c4f3ffca28e5e0621e126c7ff31eb9"
                },
                {
                  "fixed": "5eaf5246f7f73fed0b9ebf2deefdfcc4a7c8cf8b"
                },
                {
                  "fixed": "e362d4cf540b27730482455c8fc02efe57d16702"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.2.0"
                      },
                      {
                        "fixed": "8.2.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e362d4cf540b27730482455c8fc02efe57d16702"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "astro@7.2.4",
            "@astrojs/vercel@11.0.7",
            "@astrojs/react@6.0.4",
            "@astrojs/preact@6.0.4",
            "@astrojs/node@11.1.4",
            "@astrojs/netlify@8.2.3",
            "@astrojs/mdx@7.0.7",
            "@astrojs/markdown-satteri@0.3.7",
            "@astrojs/markdown-remark@7.2.4",
            "@astrojs/markdoc@2.0.8",
            "@astrojs/internal-helpers@0.10.4",
            "@astrojs/cloudflare@14.2.3",
            "astro@7.2.3",
            "@astrojs/vercel@11.0.6",
            "@astrojs/ts-plugin@1.10.11",
            "@astrojs/react@6.0.3",
            "@astrojs/preact@6.0.3",
            "@astrojs/node@11.1.3",
            "@astrojs/netlify@8.2.2",
            "@astrojs/mdx@7.0.6",
            "@astrojs/markdown-satteri@0.3.6",
            "@astrojs/markdown-remark@7.2.3",
            "@astrojs/markdoc@2.0.7",
            "@astrojs/internal-helpers@0.10.3",
            "@astrojs/cloudflare@14.2.2",
            "astro@7.2.2",
            "@astrojs/node@11.1.2",
            "astro@7.2.1",
            "@astrojs/underscore-redirects@1.0.4",
            "@astrojs/node@11.1.1",
            "@astrojs/netlify@8.2.1",
            "@astrojs/language-server@2.16.14",
            "@astrojs/cloudflare@14.2.1",
            "astro@7.2.0",
            "@astrojs/vue@7.0.2",
            "@astrojs/vercel@11.0.5",
            "@astrojs/upgrade@0.7.4",
            "@astrojs/solid-js@7.0.2",
            "@astrojs/node@11.1.0",
            "@astrojs/netlify@8.2.0",
            "@astrojs/cloudflare@14.2.0",
            "astro@7.1.6",
            "@astrojs/cloudflare@14.1.7",
            "astro@7.1.5",
            "astro-vscode@2.16.18",
            "@astrojs/vercel@11.0.4",
            "@astrojs/react@6.0.2",
            "@astrojs/preact@6.0.2",
            "@astrojs/node@11.0.3",
            "@astrojs/netlify@8.1.3",
            "@astrojs/mdx@7.0.5",
            "@astrojs/markdown-satteri@0.3.5",
            "@astrojs/markdown-remark@7.2.2",
            "@astrojs/markdoc@2.0.6",
            "@astrojs/internal-helpers@0.10.2",
            "@astrojs/cloudflare@14.1.6",
            "create-astro@5.2.3",
            "astro@7.1.4",
            "@astrojs/mdx@7.0.4",
            "@astrojs/markdoc@2.0.5",
            "@astrojs/cloudflare@14.1.5",
            "@astrojs/check@0.9.10",
            "@astrojs/markdoc@2.0.4",
            "@astrojs/language-server@2.16.13",
            "astro@7.1.3",
            "@astrojs/cloudflare@14.1.4",
            "astro@7.1.2",
            "astro@7.1.1",
            "astro@7.1.0",
            "astro@7.0.9",
            "@astrojs/vercel@11.0.3",
            "astro@7.0.8",
            "@astrojs/netlify@8.1.2",
            "@astrojs/mdx@7.0.3",
            "@astrojs/markdown-satteri@0.3.4",
            "@astrojs/language-server@2.16.12",
            "@astrojs/cloudflare@14.1.3",
            "astro@7.0.7",
            "@astrojs/telemetry@3.3.3",
            "@astrojs/cloudflare@14.1.2",
            "create-astro@5.2.2",
            "astro@7.0.6",
            "@astrojs/vercel@11.0.2",
            "@astrojs/ts-plugin@1.10.10",
            "@astrojs/solid-js@7.0.1",
            "@astrojs/react@6.0.1",
            "@astrojs/preact@6.0.1",
            "@astrojs/node@11.0.2",
            "@astrojs/netlify@8.1.1",
            "@astrojs/mdx@7.0.2",
            "@astrojs/markdown-satteri@0.3.3",
            "@astrojs/markdown-remark@7.2.1",
            "@astrojs/markdoc@2.0.3",
            "@astrojs/language-server@2.16.11",
            "@astrojs/internal-helpers@0.10.1",
            "@astrojs/cloudflare@14.1.1",
            "astro@7.0.5",
            "astro-vscode@2.16.17",
            "@astrojs/vue@7.0.1",
            "@astrojs/vercel@11.0.1",
            "@astrojs/svelte@9.0.1",
            "@astrojs/node@11.0.1",
            "@astrojs/netlify@8.1.0",
            "@astrojs/mdx@7.0.1",
            "@astrojs/markdoc@2.0.2",
            "@astrojs/cloudflare@14.1.0",
            "create-astro@5.2.1",
            "astro@7.0.4",
            "@astrojs/rss@4.0.19",
            "@astrojs/cloudflare@14.0.2",
            "create-astro@5.2.0",
            "astro@7.0.3",
            "@astrojs/upgrade@0.7.3",
            "@astrojs/markdoc@2.0.1",
            "@astrojs/cloudflare@14.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102983.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.058878088Z",
      "provider": "osv",
      "references": [
        "https://github.com/withastro/astro/releases/tag/@astrojs/netlify@8.2.4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102983.json",
        "https://github.com/withastro/astro/security/advisories/GHSA-4233-jc72-56c5",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-102983",
        "https://github.com/withastro/astro/commit/e362d4cf540b27730482455c8fc02efe57d16702",
        "https://github.com/withastro/astro/pull/17752"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-625",
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102983.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-102983",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487151,
  "published_at": "2026-09-30T14:32:03.861+00:00"
}