Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2025-66564— Sigstore Timestamp Authority allocates excessive memory during request parsing

Quick assessment

Affected
sigstore timestamp-authority
Exploitation
Public or AI PoC available; prioritize validation
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开源的一个RFC3161时间戳授权软件。 Sigstore Timestamp Authority 2.0.3之前版本存在安全漏洞，该漏洞源于api.ParseJSONRequest和api.getContentType函数对非信任数据处理不当，可能导致内存过度分配。

CVSS 7.5 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2025-66564

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Sigstore Timestamp Authority allocates excessive memory during request parsing
Source: CVE Program / CVE List V5
Vulnerability Description
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.0.3, Function api.ParseJSONRequest currently splits (via a call to strings.Split) an optionally-provided OID (which is untrusted data) on periods. Similarly, function api.getContentType splits the Content-Type header (which is also untrusted data) on an application string. As a result, in the face of a malicious request with either an excessively long OID in the payload containing many period characters or a malformed Content-Type header, a call to api.ParseJSONRequest or api.getContentType incurs allocations of O(n) bytes (where n stands for the length of the function's argument). This vulnerability is fixed in 2.0.3.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Sigstore Timestamp Authority 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sigstore Timestamp Authority是sigstore开源的一个RFC3161时间戳授权软件。 Sigstore Timestamp Authority 2.0.3之前版本存在安全漏洞，该漏洞源于api.ParseJSONRequest和api.getContentType函数对非信任数据处理不当，可能导致内存过度分配。
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 < 2.0.3 -

II. Public POCs for CVE-2025-66564

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8671 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2025-66564

请登录查看更多情报信息。

IV. Related Vulnerabilities

Same product: timestamp-authority
Same vendor: sigstore
Same weakness: CWE-405

V. Comments for CVE-2025-66564

No comments yet

Leave a comment