CVE-2026-41855Network attack vector

Arbitrary class instantiation via unrestricted JMS deserialization

Published Jun 9, 2026 · Updated Jun 9, 2026

Unsafe deserialization in Spring Framework's Jackson JMS converters allows remote attackers to instantiate arbitrary classes through JMS messages. The converters accept message-supplied type metadata without restricting deserialization to approved packages, allowing Jackson to resolve and construct attacker-selected gadget classes. Exploitation requires an untrusted JMS environment and Spring Framework 5.3.0 through 5.3.48, 6.1.0 through 6.1.27, 6.2.0 through 6.2.18, or 7.0.0 through 7.0.7; successful gadget execution permits unauthorized actions with application privileges.

CVSS severity8.1
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Spring Framework's Jackson JMS converters allows remote attackers to instantiate arbitrary classes through JMS messages. The converters accept message-supplied type metadata without restricting deserialization to approved packages, allowing Jackson to resolve and construct attacker-selected gadget classes. Exploitation requires an untrusted JMS environment and Spring Framework 5.3.0 through 5.3.48, 6.1.0 through 6.1.27, 6.2.0 through 6.2.18, or 7.0.0 through 7.0.7; successful gadget execution permits unauthorized actions with application privileges.

The record

CVE
CVE-2026-41855
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Spring
Product
Spring Framework
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.3.0 <5.3.49
  2. Affected versionversion=6.1.0 <6.1.28
  3. Affected versionversion=6.2.0 <6.2.19
  4. Affected versionversion=7.0.0 <7.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring · Spring Frameworkversion=5.3.0 <5.3.49; version=6.1.0 <6.1.28; version=6.2.0 <6.2.19; version=7.0.0 <7.0.8

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1VMwareCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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