Description
Improper 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.
Published: 2026-10-19
Score: 6.5 Medium
EPSS: n/a
KEV: No
Impact: Mail Header Injection
Action: Immediate Patch
AI Analysis

Impact

Improper Input Validation in Apache Camel Mail component's MimeMultipart data format allows unfiltered mapping of mail.smtp headers onto the Exchange during unmarshalling. An attacker can craft a multipart message that injects arbitrary mail.smtp header values, influencing downstream mail producers and potentially enabling spoofed or malicious email sending. This vulnerability corresponds to CWE-20.

Affected Systems

Vulnerable versions include Apache Camel release 4..0 through 4.18.4, and 4.19.0 through 4.22.0. The fix is available in Apache Camel 4.23.0, with LTS streams receiving equivalent updates in 4.18.5 and 4.22.1.

Risk and Exploitability

The CVSS score of 6.5 places the issue in the medium severity range. EPSS is not available, and the vulnerability is not listed in the CISA KEV catalog. Exploitation would require an attacker to send a crafted multipart message to a Camel instance that processes mail, exploiting the unfiltered header path. The likely attack vector is remote via the mail component, and mitigations rely on applying the official patch or temporary header stripping.

Generated by OpenCVE AI on October 19, 2026 at 13:24 UTC.

Remediation

Vendor Solution

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.

Vendor Workaround

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

OpenCVE Recommended Actions

  • Upgrade to Apache Camel 4.23.0 (or 4.22.1 for stream 4.22, 4.18.5 for stream 4.18) to receive the definitive fix.
  • Apply the official workaround by stripping the mail.smtp namespace headers after the data format with removeHeaders("mail.smtp*") before any mail producer for immediate protection.
  • Restrict inbound traffic to Camel mail endpoints to trusted networks only to limit exposure to crafted multipart messages.

Generated by OpenCVE AI on October 19, 2026 at 13:24 UTC.

Tracking

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Advisories

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History

Mon, 19 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 19 Oct 2026 11:00:00 +0000

Type Values Removed Values Added
Description Improper 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.
Title Apache Camel: Camel-Mail Header Injection via Unfiltered mail.smtp Headers in the MimeMultipart Data Format (Incomplete Fix of CVE-2026-46584)
Weaknesses CWE-20
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-10-19T14:32:46.401Z

Reserved: 2026-09-03T16:45:25.143Z

Link: CVE-2026-85314

cve-icon Vulnrichment

Updated: 2026-10-19T14:32:37.424Z

cve-icon NVD

Status : Received

Published: 2026-10-19T11:17:24.700

Modified: 2026-10-19T15:17:07.947

Link: CVE-2026-85314

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-19T13:30:14Z

Weaknesses
  • CWE-20

    Improper Input Validation