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CVE-2026-49834

Status: AnalyzedHigh (7.5)—

sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vulnerabilidad en librería expuesta (sigstore-go) accesible por red sin autenticación (AV:N PR:N UI:N) que permite eludir validación de firma de múltiples logs, comprometiendo integridad de verificación criptográfica (CWE-347, I:H).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account ManagementVulnerability ScanningRestrict File and Directory PermissionsRestrict Registry PermissionsRemote Data StorageNetwork Segmentation

Affected technologies (1)

Sigstore — Sigstore-go

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-49834",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
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            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
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          ],
          "version": "2.0.3",
          "timestamp": "2026-07-17T19:42:04.325650Z"
        }
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          "attackComplexity": "HIGH",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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  "published": "2026-07-17T20:17:21.963",
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    {
      "url": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0",
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    }
  ],
  "lastModified": "2026-07-30T13:18:22.090",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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