Apache Camel Security Advisory - CVE-2026-33454

Apache Camel security advisory: CVE-2026-33454

Severity

HIGH

Summary

Camel-Mail Message Header Injection via Improper Filtering

Versions affected

From 3.0.0 before 4.14.6, from 4.15.0 before 4.18.1.

Versions fixed

4.14.6, 4.18.1 and 4.19.0

Description

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).

Notes

The JIRA ticket: https://issues.apache.org/jira/browse/CAMEL-23222 refers to the various commits that resolved the issue, and have more details. This CVE is related to CVE-2025-27636, CVE-2025-29891 and CVE-2025-30177.

Mitigation

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.

Credit

This issue was discovered and reported by Hyunwoo Kim (@v4bel)

References

PGP signed advisory data: CVE-2026-33454.txt.asc
Mitre CVE Entry: https://www.cve.org/CVERecord?id=CVE-2026-33454