CVE-2026-49834— sigstore-go: Multi-log threshold bypass via single compromised log
Quick assessment
Affected
sigstore sigstore-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
sigstore sigstore-go是sigstore组织开源的一个 Sigstore 的客户端库。 sigstore-go 1.2.0之前版本存在加密问题漏洞，该漏洞源于计数逻辑问题，允许一个受破坏的透明度日志或证书透明度日志满足多日志阈值要求并绕过多日志策略。
Possible ATT&CK Techniques 1 AI
T1553.005 · Mark-of-the-Web BypassAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| sigstore | sigstore-go | < 1.2.0 |
affected |
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I. Basic Information for CVE-2026-49834
Vulnerability Information
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Vulnerability Title
sigstore-go: Multi-log threshold bypass via single compromised log
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
sigstore-go 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sigstore sigstore-go是sigstore组织开源的一个 Sigstore 的客户端库。 sigstore-go 1.2.0之前版本存在加密问题漏洞，该漏洞源于计数逻辑问题，允许一个受破坏的透明度日志或证书透明度日志满足多日志阈值要求并绕过多日志策略。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| sigstore | sigstore-go | < 1.2.0 | - |
|
II. Public POCs for CVE-2026-49834
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-49834 (2)
Vendor Advisories for CVE-2026-49834 (1)
Vendor Pages for CVE-2026-49834 (1)
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🔗 Release v1.2.0 · sigstore/sigstore-go · GitHub x_refsource_MISC
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V. Comments for CVE-2026-49834
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