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CVE-2026-24122— Cosign Certificate Chain Expiry Validation Issue Allows Issuing Certificate Expiry to Be Overlooked

Quick assessment

Affected
sigstore cosign
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.

cosign是美国的一个 OCI 注册表中的容器签名、验证和存储。 Cosign 3.0.4及之前版本存在信任管理问题漏洞，该漏洞源于证书验证逻辑问题，可能导致在验证时错误地将已过期的签发证书视为有效。

CVSS 3.7 · Low EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1553.005 · Mark-of-the-Web Bypass
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I. Basic Information for CVE-2026-24122

Vulnerability Information
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Vulnerability Title
Cosign Certificate Chain Expiry Validation Issue Allows Issuing Certificate Expiry to Be Overlooked
Source: CVE Program / CVE List V5
Vulnerability Description
Cosign provides code signing and transparency for containers and binaries. In versions 3.0.4 and below, an issuing certificate with a validity that expires before the leaf certificate will be considered valid during verification even if the provided timestamp would mean the issuing certificate should be considered expired. When verifying artifact signatures using a certificate, Cosign first verifies the certificate chain using the leaf certificate's "not before" timestamp and later checks expiry of the leaf certificate using either a signed timestamp provided by the Rekor transparency log or from a timestamp authority, or using the current time. The root and all issuing certificates are assumed to be valid during the leaf certificate's validity. There is no impact to users of the public Sigstore infrastructure. This may affect private deployments with customized PKIs. This issue has been fixed in version 3.0.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
cosign 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cosign是美国的一个 OCI 注册表中的容器签名、验证和存储。 Cosign 3.0.4及之前版本存在信任管理问题漏洞，该漏洞源于证书验证逻辑问题，可能导致在验证时错误地将已过期的签发证书视为有效。
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 cosign < 3.0.5 -

II. Public POCs for CVE-2026-24122

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III. Intelligence Information for CVE-2026-24122

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IV. Related Vulnerabilities

Same product: cosign
Same vendor: sigstore
Same weakness: CWE-295

V. Comments for CVE-2026-24122

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