CVE-2026-40859Network attack vector

Code execution via unfiltered Java response deserialization

Published Jul 6, 2026 · Updated Jul 6, 2026

Unsafe deserialization in Apache Camel allows remote attackers controlling an HTTP backend to execute code through crafted error responses. The VertxHttpHelper.deserializeJavaObjectFromStream and NettyHttpHelper.deserializeJavaObjectFromStream paths pass serialized 5xx response bodies to raw ObjectInputStream instances without an ObjectInputFilter. Reachability requires transferException=true or allowJavaSerializedObject=true, the default throwExceptionOnFailure=true setting, an attacker-controlled backend or plain-HTTP interception, and a usable classpath gadget chain; default configurations are not affected.

CVSS severity8.1
High
EPSS probability0.89%
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 Apache Camel allows remote attackers controlling an HTTP backend to execute code through crafted error responses. The VertxHttpHelper.deserializeJavaObjectFromStream and NettyHttpHelper.deserializeJavaObjectFromStream paths pass serialized 5xx response bodies to raw ObjectInputStream instances without an ObjectInputFilter. Reachability requires transferException=true or allowJavaSerializedObject=true, the default throwExceptionOnFailure=true setting, an attacker-controlled backend or plain-HTTP interception, and a usable classpath gadget chain; default configurations are not affected.

The record

CVE
CVE-2026-40859
Published
Jul 6, 2026
Updated
Jul 6, 2026
Vendor
The Apache Software Foundation
Product
Apache Camel
Classifications
CWE-502, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 6, 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=4.0.0 <4.14.8
  2. Affected versionversion=4.15.0 <4.18.3
  3. Affected versionversion=4.19.0 <4.20.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Camelversion=4.0.0 <4.14.8; version=4.15.0 <4.18.3; version=4.19.0 <4.20.0

Published CVSS scores

8.1CISA-ADPCVSS: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.

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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
T1203Exploitation for Client Execution

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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