---
id: CVE-2026-33454
title: The Camel-Mail component is vulnerable to Camel message header injection
summary: >-
  The Camel-Mail component is vulnerable to Camel message header injection. The
  custom header filter strategy used by the component (MailHeaderFilterStrategy)
  only filters the 'out' direction via setOutFilterStartsWith, while it does not
  c…
severity: critical
cvss: 9.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L'
cwe:
  - CWE-502
  - CWE-1173
published: '2026-04-27'
updated: '2026-06-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-33454'
references:
  - url: 'https://camel.apache.org/security/CVE-2026-33454.html'
    label: security@apache.org
  - url: 'https://access.redhat.com/errata/RHSA-2026:17668'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:19835'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-33454'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2463181'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33454.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-33454'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-33454'
tags:
  - nvd
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.01034
epssPercentile: 0.62286
ingestedAt: '2026-06-29T13:24:34.828Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/oscerd/CVE-2026-33454'
  checkedAt: '2026-09-25T08:20:55.061Z'
exploitAvailable: true
vendor: Red Hat
product: Red Hat build of Apache Camel 4 for Quarkus 3
affected:
  - build_of_apache_camel_4_for_quarkus 3
  - build_of_apache_camel_4_18_1_for_spring_boot 3.5.14
patched:
  - build_of_apache_camel_4_18_1_for_spring_boot 3.5.14
---

## Overview

The Camel-Mail component is vulnerable to Camel message header injection. The custom header filter strategy used by the component (MailHeaderFilterStrategy) only filters the 'out' direction via setOutFilterStartsWith, while it does not configure the 'in' direction via setInFilterStartsWith. As a result, when a Camel application consumes mail through camel-mail (for example via from(\"imap://...\") or from(\"pop3://...\")) the inbound filter check is skipped and Camel-prefixed MIME headers are mapped unfiltered into the Exchange. An attacker who can deliver an email to a mailbox monitored by such a consumer can inject Camel-specific headers that, for some Camel components downstream of the mail consumer (such as camel-bean, camel-exec, or camel-sql), can alter the behaviour of the route. This is the same pattern that was previously addressed in camel-undertow (CVE-2025-30177) and the broader incoming-header filter (CVE-2025-27636 and CVE-2025-29891).

This issue affects Apache Camel: from 3.0.0 before 4.14.6, from 4.15.0 before 4.18.1.

Users are recommended to upgrade to version 4.19.0, which fixes the issue. If users are on the 4.18.x LTS releases stream, then they are suggested to upgrade to 4.18.1. If users are on the 4.14.x LTS releases stream, then they are suggested to upgrade to 4.14.6.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:17668** · Red Hat · fixed in: Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14 · released 2026-05-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:17668)
- **Red Hat VEX** · Critical · affected: Red Hat build of Apache Camel 4 for Quarkus 3 · no fix planned: Red Hat build of Apache Camel 4 for Quarkus 3 · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33454.json)