Vulnerability-Lookup

CVE-2026-48815 (GCVE-0-2026-48815)

Vulnerability from cvelistv5 – Published: 2026-07-14 20:27 – Updated: 2026-07-15 12:56

Title

sigstore-js: `certificateOIDs` verification constraints are silently dropped and never enforced

Summary

sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 4.1.1, the documented certificateOIDs option in sigstore.verify() is accepted by the public API but discarded before verification, so required certificate extension OIDs are never checked and applications relying on certificateOIDs to restrict which certificates may sign artifacts can accept unauthorized certificates. This issue is fixed in version 4.1.1.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/sigstore/sigstore-js/security/…	x_refsource_CONFIRM
https://github.com/sigstore/sigstore-js/pull/1658	x_refsource_MISC
https://github.com/sigstore/sigstore-js/commit/78…	x_refsource_MISC
https://github.com/sigstore/sigstore-js/releases/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
sigstore	sigstore-js	Affected: < 4.1.1

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-48815

Vulnerability from fkie_nvd - Published: 2026-07-14 21:17 - Updated: 2026-07-15 14:18

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/sigstore/sigstore-js/commit/7845532f9d17f6f765363dbee82b01bd159fb52b
	security-advisories@github.com	https://github.com/sigstore/sigstore-js/pull/1658
	security-advisories@github.com	https://github.com/sigstore/sigstore-js/releases/tag/sigstore%404.1.1
	security-advisories@github.com	https://github.com/sigstore/sigstore-js/security/advisories/GHSA-52v5-jr5w-gjxr
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/sigstore/sigstore-js/security/advisories/GHSA-52v5-jr5w-gjxr

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "sigstore-js",
          "vendor": "sigstore",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.1.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 4.1.1, the documented certificateOIDs option in sigstore.verify() is accepted by the public API but discarded before verification, so required certificate extension OIDs are never checked and applications relying on certificateOIDs to restrict which certificates may sign artifacts can accept unauthorized certificates. This issue is fixed in version 4.1.1."
    }
  ],
  "id": "CVE-2026-48815",
  "lastModified": "2026-07-15T14:18:15.313",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
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        "ssvcData": {
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          "options": [
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            }
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          "role": "CISA Coordinator",
          "timestamp": "2026-07-15T12:56:21.913994Z",
          "version": "2.0.3"
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  "published": "2026-07-14T21:17:01.370",
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      "url": "https://github.com/sigstore/sigstore-js/commit/7845532f9d17f6f765363dbee82b01bd159fb52b"
    },
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      "source": "security-advisories@github.com",
      "url": "https://github.com/sigstore/sigstore-js/pull/1658"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sigstore/sigstore-js/releases/tag/sigstore%404.1.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sigstore/sigstore-js/security/advisories/GHSA-52v5-jr5w-gjxr"
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}

GHSA-52V5-JR5W-GJXR

Vulnerability from github – Published: 2026-07-01 19:58 – Updated: 2026-07-01 19:58

Summary

sigstore's `certificateOIDs` verification constraints are silently dropped and never enforced

Details

Summary

The documented certificateOIDs option in sigstore.verify() is accepted by the public API but discarded before verification, so required certificate extension OIDs are never checked.

Details

The public verify options include certificateOIDs and the documentation says those OID/value pairs “must be present in the certificate’s extension list.” The policy-construction path used by sigstore.verify() and createVerifier() only copies the SAN and issuer settings into the verification policy and completely ignores certificateOIDs.

As a result, callers can believe they are constraining verification to certificates carrying specific Fulcio or workload-identifying OIDs, while the actual verifier never receives those constraints. Any bundle that satisfies the remaining checks is accepted even if the required OID extensions are absent or mismatched.

This is reachable from supported usage through the documented certificateOIDs verify option.

PoC

const { createVerificationPolicy } = require("sigstore/dist/config");

const policy = createVerificationPolicy({
  certificateIssuer: "https://issuer.example",
  certificateIdentityEmail: "victim@example.com",
  certificateOIDs: {
    "1.2.3.4": "required-value",
  },
});

console.log("certificateOIDs" in policy, JSON.stringify(policy));
// false {"subjectAlternativeName":"victim@example.com","extensions":{"issuer":"https://issuer.example"}}

Impact

Applications that rely on certificateOIDs to restrict which certificates may sign artifacts receive no such protection. Unauthorized certificates that should be rejected on extension policy can be accepted as long as they satisfy the remaining verification checks.

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "sigstore"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-48815"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-01T19:58:28Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe documented `certificateOIDs` option in `sigstore.verify()` is accepted by the public API but discarded before verification, so required certificate extension OIDs are never checked.\n\n### Details\n\nThe public verify options include `certificateOIDs` and the documentation says those OID/value pairs \u201cmust be present in the certificate\u2019s extension list.\u201d The policy-construction path used by `sigstore.verify()` and `createVerifier()` only copies the SAN and issuer settings into the verification policy and completely ignores `certificateOIDs`.\n\nAs a result, callers can believe they are constraining verification to certificates carrying specific Fulcio or workload-identifying OIDs, while the actual verifier never receives those constraints. Any bundle that satisfies the remaining checks is accepted even if the required OID extensions are absent or mismatched.\n\nThis is reachable from supported usage through the documented `certificateOIDs` verify option.\n\n### PoC\n\n```javascript\nconst { createVerificationPolicy } = require(\"sigstore/dist/config\");\n\nconst policy = createVerificationPolicy({\n  certificateIssuer: \"https://issuer.example\",\n  certificateIdentityEmail: \"victim@example.com\",\n  certificateOIDs: {\n    \"1.2.3.4\": \"required-value\",\n  },\n});\n\nconsole.log(\"certificateOIDs\" in policy, JSON.stringify(policy));\n// false {\"subjectAlternativeName\":\"victim@example.com\",\"extensions\":{\"issuer\":\"https://issuer.example\"}}\n```\n\n### Impact\n\nApplications that rely on `certificateOIDs` to restrict which certificates may sign artifacts receive no such protection. Unauthorized certificates that should be rejected on extension policy can be accepted as long as they satisfy the remaining verification checks.",
  "id": "GHSA-52v5-jr5w-gjxr",
  "modified": "2026-07-01T19:58:28Z",
  "published": "2026-07-01T19:58:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sigstore/sigstore-js/security/advisories/GHSA-52v5-jr5w-gjxr"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sigstore/sigstore-js"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sigstore\u0027s `certificateOIDs` verification constraints are silently dropped and never enforced"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-48815 (GCVE-0-2026-48815)

FKIE_CVE-2026-48815

GHSA-52V5-JR5W-GJXR

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature