CVE-2026-33454Network attack vector

Route manipulation via unfiltered MIME headers

Published Apr 27, 2026 · Updated Apr 27, 2026

Header injection in Apache Camel 3.0.0 through 4.14.5 and 4.15.0 through 4.18.0 allows remote attackers to alter mail-driven routes. MailHeaderFilterStrategy configures only the outbound Camel-prefix filter, so inbound MIME headers enter the Exchange without the corresponding check. Exploitation requires delivery to a mailbox consumed by camel-mail and a downstream component that treats the injected headers as route controls, where effects include command or SQL behavior changes.

CVSS severity9.4
Critical
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Header injection in Apache Camel 3.0.0 through 4.14.5 and 4.15.0 through 4.18.0 allows remote attackers to alter mail-driven routes. MailHeaderFilterStrategy configures only the outbound Camel-prefix filter, so inbound MIME headers enter the Exchange without the corresponding check. Exploitation requires delivery to a mailbox consumed by camel-mail and a downstream component that treats the injected headers as route controls, where effects include command or SQL behavior changes.

The record

CVE
CVE-2026-33454
Published
Apr 27, 2026
Updated
Apr 27, 2026
Vendor
The Apache Software Foundation
Product
Apache Camel
Classifications
CWE-1173, CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 27, 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=3.0.0 <4.14.6
  2. Affected versionversion=4.15.0 <4.18.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Camelversion=3.0.0 <4.14.6; version=4.15.0 <4.18.1

Published CVSS scores

9.4redhat-SADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
9.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1173Improper Use of Validation Framework
CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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