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CVE-2026-49835— Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality

Quick assessment

Affected
sigstore timestamp-authority
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 timestamp-authority是sigstore组织的一款数字时间戳授权服务软件。 Sigstore timestamp-authority 2.1.0之前版本存在资源管理错误漏洞，该漏洞源于全局wrapMetrics中间件在路由前记录原始HTTP请求路径和方法，可能导致未经身份验证的远程攻击者通过随机路径和HTTP方法创建无限时间序列条目从而耗尽内存。

CVSS 5.9 · Medium EPSS 0.74% · P53

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
sigstore timestamp-authority < 2.1.0 affected
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I. Basic Information for CVE-2026-49835

Vulnerability Information
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Vulnerability Title
Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality
Source: CVE Program / CVE List V5
Vulnerability Description
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.1.0, the global wrapMetrics middleware records raw HTTP request path r.URL.Path and raw HTTP request method r.Method as Prometheus labels for latency and request count metric vectors before routing, allowing an unauthenticated remote attacker to issue requests with random paths such as /api/v1/timestamp/<uuid> or random HTTP methods and create unbounded permanent time-series entries that exhaust memory. This issue is fixed in version 2.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Sigstore timestamp-authority 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sigstore timestamp-authority是sigstore组织的一款数字时间戳授权服务软件。 Sigstore timestamp-authority 2.1.0之前版本存在资源管理错误漏洞，该漏洞源于全局wrapMetrics中间件在路由前记录原始HTTP请求路径和方法，可能导致未经身份验证的远程攻击者通过随机路径和HTTP方法创建无限时间序列条目从而耗尽内存。
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 timestamp-authority < 2.1.0 -

II. Public POCs for CVE-2026-49835

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III. Intelligence Information for CVE-2026-49835

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Patches & Fixes for CVE-2026-49835 (1)

Vendor Advisories for CVE-2026-49835 (1)

Vendor Pages for CVE-2026-49835 (1)

IV. Related Vulnerabilities

Same product: timestamp-authority
Same vendor: sigstore
Same weakness: CWE-770

V. Comments for CVE-2026-49835

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