CVE-2026-33454
CriticalCVSS 9.4Exploitation Probability (EPSS)
Low risk45th percentile — higher than 45% of all known CVEs
Summary
The Camel-Mail component does not filter MIME headers in the inbound direction, allowing an attacker to inject Camel headers into the Exchange. This affects Apache Camel versions from 3.0.0 before 4.14.6 and from 4.15.0 before 4.18.1.
Risk Assessment
An attacker can deliver a crafted email to a mailbox monitored by a Camel application, potentially altering route behavior and leading to unauthorized actions in components such as camel-bean, camel-exec, or camel-sql.
Recommendation
Upgrade to version 4.19.0, or for LTS releases, to 4.18.1 (for 4.18.x) or 4.14.6 (for 4.14.x).
Original NVD description (English source)
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.