---
cve: "CVE-2026-49834"
severity: "MEDIUM"
cvss: 5.9
epss: "11%"
vendor: "sigstore"
kev: false
exploited: false
published: "2026-07-17 20:17:21"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T14:34:22+02:00"
---

# CVE-2026-49834

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 8ca80c47ef03d26ebf174db7c296700b075b2c16 (Commit)
- dbb07e62623edd5b175fb9dd5a41dcb85a159207 (Commit)

## Referenzen

- <https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6>
- <https://github.com/sigstore/sigstore-go/pull/633>
- <https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207>
- <https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-49834) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_