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CVE-2026-48816— sigstore-js: Insufficient Verification of Data Authenticity

Quick assessment

Affected
sigstore sigstore-js
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-js是美国sigstore组织的一个JavaScript签名服务库。 sigstore sigstore-js 3.1.1之前版本存在输入验证错误漏洞，该漏洞源于透明日志时间戳的生成方式可能导致不受信任的捆绑包影响证书有效性和时间戳阈值验证决策。

CVSS 6.5 · Medium EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
sigstore sigstore-js < 3.1.1 affected
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I. Basic Information for CVE-2026-48816

Vulnerability Information
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Vulnerability Title
sigstore-js: Insufficient Verification of Data Authenticity
Source: CVE Program / CVE List V5
Vulnerability Description
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.1.1, @sigstore/verify derives a transparency-log timestamp from tlogEntries[].integratedTime for bundle v0.2 inclusionProof-only entries even though the inclusion proof path does not cryptographically bind integratedTime, allowing an attacker who can supply an untrusted bundle to influence certificate validity and timestampThreshold verification decisions. This issue is fixed in version 3.1.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
sigstore sigstore-js 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sigstore sigstore-js是美国sigstore组织的一个JavaScript签名服务库。 sigstore sigstore-js 3.1.1之前版本存在输入验证错误漏洞，该漏洞源于透明日志时间戳的生成方式可能导致不受信任的捆绑包影响证书有效性和时间戳阈值验证决策。
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-js < 3.1.1 -

II. Public POCs for CVE-2026-48816

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III. Intelligence Information for CVE-2026-48816

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Patches & Fixes for CVE-2026-48816 (2)

Vendor Advisories for CVE-2026-48816 (1)

Vendor Pages for CVE-2026-48816 (1)

Same Patch Batch · sigstore · 2026-07-14 · 4 CVEs total

CVE-2026-59891 9.6 CRITICAL Credential confusion in  @sigstore/oci  can leak registry credentials to an attacker-contr
CVE-2026-48815 7.5 HIGH sigstore-js: `certificateOIDs` verification constraints are silently dropped and never enf
CVE-2026-48758 5.4 MEDIUM sigstore-js: DSSE payloadType type-binding failure

IV. Related Vulnerabilities

Same product: sigstore-js
Same vendor: sigstore
Same weakness: CWE-345

V. Comments for CVE-2026-48816

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