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CVE-2026-54164— API Platform Core: Missing IRI type check enables resource type confusion

Quick assessment

Affected
api-platform core
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.

API Platform Core是API Platform团队开源的一个 API Platform 的服务器组件。 API Platform Core存在缓冲区错误漏洞，该漏洞源于序列化器的AbstractItemNormalizer在解析关系IRI时未验证返回的资源类型，导致类型混淆，可能使非预期类型的资源被静默赋值给关系属性。攻击者可以通过提交写请求，提供指向不同类型资源的关系IRI，从而绕过类型检查。以下版本受到影响：4.1.30之前版本、4.2.0版本至4.2.26之前版本和4.3.0版本至4.

CVSS 6.5 · Medium EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
api-platform core < 4.1.30 affected
>= 4.2.0, < 4.2.26 affected
>= 4.3.0, < 4.3.12 affected
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I. Basic Information for CVE-2026-54164

Vulnerability Information
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Vulnerability Title
API Platform Core: Missing IRI type check enables resource type confusion
Source: CVE Program / CVE List V5
Vulnerability Description
API Platform Core is a system to create hypermedia-driven REST and GraphQL APIs. In versions prior to 4.1.30, 4.2.26 and 4.3.12, the serializer's AbstractItemNormalizer does not validate the resource type returned when resolving relation IRIs, allowing type confusion where a resource of an unintended type can be silently assigned to a relation property. An attacker who can submit write requests (POST/PUT/PATCH) to an API Platform endpoint with writable relations can supply a relation IRI pointing to a resource of a different type than the relation's declared class. Because getResourceFromIri() does not pass an $operation to IriConverter::getResourceFromIri(), the is_a type guard at IriConverter.php:86 is skipped. For untyped relation properties (legacy @var-only style), the wrong-typed object is silently assigned, corrupting invariants and potentially feeding downstream logic that assumes the declared type (CWE-843). For typed properties (modern PHP 8.x), the substitution is blocked by Symfony's PropertyAccessor with an InvalidTypeException. This issue has been fixed in versions 4.1.30, 4.2.26 and 4.3.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5
Vulnerability Title
API Platform Core 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
API Platform Core是API Platform团队开源的一个 API Platform 的服务器组件。 API Platform Core存在缓冲区错误漏洞，该漏洞源于序列化器的AbstractItemNormalizer在解析关系IRI时未验证返回的资源类型，导致类型混淆，可能使非预期类型的资源被静默赋值给关系属性。攻击者可以通过提交写请求，提供指向不同类型资源的关系IRI，从而绕过类型检查。以下版本受到影响：4.1.30之前版本、4.2.0版本至4.2.26之前版本和4.3.0版本至4.
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
api-platform core < 4.1.30 -

II. Public POCs for CVE-2026-54164

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III. Intelligence Information for CVE-2026-54164

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Vendor Advisories for CVE-2026-54164 (1)

IV. Related Vulnerabilities

Same product: core
Same vendor: api-platform
Same weakness: CWE-843

V. Comments for CVE-2026-54164

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