CVE-2026-33454
CriticalCVSS 9.4Exploitation Probability (EPSS)
Low risk46th percentile - higher than 46% of all known CVEs
Summary
The Camel-Mail component in Apache Camel fails to filter MIME headers in the 'in' direction, allowing an attacker to inject Camel-specific headers by delivering a crafted email. The vulnerability affects versions from 3.0.0 to 4.14.5 and from 4.15.0 to 4.18.0.
Risk Assessment
An attacker can alter the behavior of a Camel route, impacting downstream components (e.g., camel-bean, camel-exec, camel-sql), potentially leading to unauthorized code execution or data manipulation.
Recommendation
Upgrade immediately to Apache Camel version 4.19.0, or to 4.18.1 for 4.18.x LTS, or to 4.14.6 for 4.14.x LTS.
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.