CVE-2026-48791 (GCVE-0-2026-48791)

Vulnerability from cvelistv5 – Published: 2026-08-12 23:42 – Updated: 2026-08-12 23:42
VLAI
Title
Sigstore Java has a vulnerability with bundle verification of integratedTime
Summary
sigstore-java is a sigstore java client for interacting with sigstore infrastructure. Version 2.0.0 erroneously removed verification of the integrated (Rekor entry) time) against the Fulcio certificate. Version 2.1.0 re-added this verification with enhancements that adhere to the Sigstore verification spec. The old sigstore-conformance test for this check was built incorrectly. This vulnerability impacts only users verifying bundles with `dev.sigstore:sigstore-java:2.0.0`. Older versions are not affected; it is fixed in `dev.sigstore:sigstore-java:2.1.0` A malicious actor may exploit this if they were able to access a users system and exfiltrate the temporary private key used during signing and then reuse an old fulcio certificate later without requiring direct access to the user's credentials. Users may protect themselves by re-verifying their artifacts using the newest sigstore-java or another current sigstore client. Transparency logs may also be audited for unauthorized signatures for a suspected reused identity.
Severity
2 (Low)
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
sigstore sigstore-java Affected: = 2.0.0
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    "cna": {
      "affected": [
        {
          "product": "sigstore-java",
          "vendor": "sigstore",
          "versions": [
            {
              "status": "affected",
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      "descriptions": [
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          "value": "sigstore-java is a sigstore java client for interacting with sigstore infrastructure. Version 2.0.0 erroneously removed verification of the integrated (Rekor entry) time) against the Fulcio certificate. Version 2.1.0 re-added this verification with enhancements that adhere to the Sigstore verification spec. The old sigstore-conformance test for this check was built incorrectly. This vulnerability impacts only users verifying bundles with `dev.sigstore:sigstore-java:2.0.0`. Older versions are not affected; it is fixed in `dev.sigstore:sigstore-java:2.1.0` A malicious actor may exploit this if they were able to access a users system and exfiltrate the temporary private key used during signing and then reuse an old fulcio certificate later without requiring direct access to the user\u0027s credentials. Users may protect themselves by re-verifying their artifacts using the newest sigstore-java or another current sigstore client. Transparency logs may also be audited for unauthorized signatures for a suspected reused identity."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 2,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N",
            "version": "3.1"
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
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          "tags": [
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          "url": "https://github.com/sigstore/sigstore-java/security/advisories/GHSA-qqw8-7c2r-jxch"
        },
        {
          "name": "https://github.com/sigstore/sigstore-java/pull/1008",
          "tags": [
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          "url": "https://github.com/sigstore/sigstore-java/pull/1008"
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          "name": "https://github.com/sigstore/sigstore-java/commit/4b7a49ebb1813f5b1ff113bcad63246358222d61",
          "tags": [
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          "url": "https://github.com/sigstore/sigstore-java/commit/4b7a49ebb1813f5b1ff113bcad63246358222d61"
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          "tags": [
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          "url": "https://github.com/sigstore/sigstore-java/commit/b529335728fc5cfb574161b4b3c06859a8a2aa88"
        }
      ],
      "source": {
        "advisory": "GHSA-qqw8-7c2r-jxch",
        "discovery": "UNKNOWN"
      },
      "title": "Sigstore Java has a vulnerability with bundle verification of integratedTime"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-48791",
    "datePublished": "2026-08-12T23:42:23.573Z",
    "dateReserved": "2026-05-22T20:18:20.366Z",
    "dateUpdated": "2026-08-12T23:42:23.573Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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