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CVE-2025-64529— SpiceDB's WriteRelationships fails silently if payload is too big

Quick assessment

Affected
authzed spicedb
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.

SpiceDB是Authzed团队的一个细粒度权限数据库。 SpiceDB 1.45.2之前版本存在安全漏洞，该漏洞源于使用排除运算符时未正确处理写入关系调用，可能导致权限检查结果错误。

AI Predicted 8.6 Difficulty: Moderate EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-64529

Vulnerability Information
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Vulnerability Title
SpiceDB's WriteRelationships fails silently if payload is too big
Source: CVE Program / CVE List V5
Vulnerability Description
SpiceDB is an open source database system for creating and managing security-critical application permissions. In versions prior to 1.45.2, users who use the exclusion operator somewhere in their authorization schema; have configured their SpiceDB server such that `--write-relationships-max-updates-per-call` is bigger than 6500; and issue calls to WriteRelationships with a large enough number of updates that cause the payload to be bigger than what their datastore allows; will receive a successful response from their `WriteRelationships` call, when in reality that call failed, and receive incorrect permission check results, if those relationships had to be read to resolve the relation involving the exclusion. Version 1.45.2 contains a patch for the issue. As a workaround, set `--write-relationships-max-updates-per-call` to `1000`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U
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
SpiceDB 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SpiceDB是Authzed团队的一个细粒度权限数据库。 SpiceDB 1.45.2之前版本存在安全漏洞，该漏洞源于使用排除运算符时未正确处理写入关系调用，可能导致权限检查结果错误。
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
authzed spicedb < 1.45.2 -

II. Public POCs for CVE-2025-64529

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III. Intelligence Information for CVE-2025-64529

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IV. Related Vulnerabilities

Same product: spicedb
Same vendor: authzed
Same weakness: CWE-770

V. Comments for CVE-2025-64529

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