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Vulnerability · Published Aug 26, 2026 · Assigned by vmware

CVE-2026-47856JsonToObjectTransformer resolves the json__TypeId__ message header to an arbitrary class without an allow-list

Medium 6.3

In plain English

A medium-severity unsafe deserialization in Spring Integration from Spring. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.3%top 75.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Spring Integration's JSON to object conversion uses the json__TypeId__ header to choose the deserialization target type, and resolves that header value to a class with ClassUtils.forName and no type/package allow-list. Spring Integration 7.1.0 Spring Integration 7.0.0 - 7.0.5 Spring Integration 6.5.0 - 6.5.10 Spring Integration 6.4.0 - 6.4.12 Spring Integration 5.5.21 and earlier

Affected products (as reported)

VendorProductVersions
Spring Spring Integration 7.1.07.0.0 – through 7.0.56.5.0 – through 6.5.106.4.0 – through 6.4.120 – through 5.5.21

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

References