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CVE-2026-23831— Rekor COSE v0.0.1 Canonicalize crashes when passed empty Message

Quick assessment

Affected
sigstore rekor
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.

Rekor是sigstore开源的一款开源软件，能够为软件项目供应链中生成的元数据提供一个不可变的防篡改分类账。 Rekor 1.4.3及之前版本存在代码问题漏洞，该漏洞源于处理空消息时未初始化sign1Msg，可能导致空指针取消引用。

CVSS 5.3 · Medium EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2026-23831

Vulnerability Information
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Vulnerability Title
Rekor COSE v0.0.1 Canonicalize crashes when passed empty Message
Source: CVE Program / CVE List V5
Vulnerability Description
Rekor is a software supply chain transparency log. In versions 1.4.3 and below, the entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec.message, causing nil Pointer Dereference. Function validate() returns nil (success) when message is empty, leaving sign1Msg uninitialized, and Canonicalize() later dereferences v.sign1Msg.Payload. A malformed proposed entry of the cose/v0.0.1 type can cause a panic on a thread within the Rekor process. The thread is recovered so the client receives a 500 error message and service still continues, so the availability impact of this is minimal. This issue has been fixed in version 1.5.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Rekor 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rekor是sigstore开源的一款开源软件，能够为软件项目供应链中生成的元数据提供一个不可变的防篡改分类账。 Rekor 1.4.3及之前版本存在代码问题漏洞，该漏洞源于处理空消息时未初始化sign1Msg，可能导致空指针取消引用。
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 rekor < 1.5.0 -

II. Public POCs for CVE-2026-23831

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III. Intelligence Information for CVE-2026-23831

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Vendor Advisories for CVE-2026-23831 (1)

IV. Related Vulnerabilities

Same product: rekor
Same vendor: sigstore
Same weakness: CWE-476

V. Comments for CVE-2026-23831

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