Apache Camel: Camel-Mail Header Injection via Unfiltered mail.smtp Headers in the MimeMultipart Data Format (Incomplete Fix of CVE-2026-46584)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85314
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-19 11:17:24 UTC
Updated2026-10-19 20:45:51 UTC
DescriptionImproper Input Validation vulnerability in Apache Camel Mail component. This issue affects Apache Camel: from 4.0.0 before 4.18.5, from 4.19.0 before 4.22.1. CVE-2026-46584 addressed mail headers reaching the Exchange without passing through a header filter, but the MimeMultipart data format retained an unfiltered path: unmarshalling a multipart message mapped mail.smtp headers onto the Exchange with no filter applied. Those names sit outside the Camel namespace that consumer filters block, so a message crafted by an external sender could still set them, and the mail.smtp namespace influences how a downstream mail producer connects and sends. This is an incomplete fix of CVE-2026-46584 rather than a new class of defect: a deployment that applied that advisory and considered camel-mail settled remained exposed on this path. Upgrade to Apache Camel 4.23.0, which fixes the issue. Users on the 4.18.x LTS releases stream should upgrade to 4.18.5. Users on the 4.22.x LTS releases stream should upgrade to 4.22.1. The MimeMultipart data format now applies the header filter on unmarshal, closing the path CVE-2026-46584 left open. For deployments that cannot upgrade immediately, strip the namespace after the data format with removeHeaders("mail.smtp*") before any mail producer.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem Types: CWE-20 | CWE-20 CWE-20 Improper Input Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Camel affected 4.0.0 4.18.5 maven Not specified
CNA Apache Software Foundation Apache Camel affected 4.19.0 4.22.1 maven Not specified
CNA Apache Software Foundation Apache Camel unaffected 4.18.5 maven Not specified
CNA Apache Software Foundation Apache Camel unaffected 4.22.1 maven Not specified
CNA Apache Software Foundation Apache Camel unaffected 4.23.0 maven Not specified

References

ReferenceSourceLinkTags
camel.apache.org/security/CVE-2026-85314.html [email protected] camel.apache.org
github.com/apache/camel/pull/25766 [email protected] github.com
github.com/apache/camel/pull/25568 [email protected] github.com
issues.apache.org/jira/browse/CAMEL-24419 [email protected] issues.apache.org
github.com/apache/camel/pull/25765 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Claude Security (en)

CNA: Andrea Cosentino (en)

Additional Advisory Data

Solutions

CNA: Upgrade to Apache Camel 4.23.0, which fixes the issue. Users on the 4.18.x LTS releases stream should upgrade to 4.18.5. Users on the 4.22.x LTS releases stream should upgrade to 4.22.1. The MimeMultipart data format now applies the header filter on unmarshal, closing the path CVE-2026-46584 left open.

Workarounds

CNA: For deployments that cannot upgrade immediately, strip the namespace after the data format with removeHeaders("mail.smtp*") before any mail producer.

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