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PatchSiren cyber security CVE debrief

CVE-2026-46584 Apache CVE debrief

The Apache Camel Mail Component is vulnerable to Improper Input Validation and Exposure of Sensitive Information to an Unauthorized Actor. The camel-mail producer scans the outgoing Exchange for message headers in the mail.smtp. / mail.smtps. namespace and builds a per-message JavaMail sender with those values applied as JavaMail session properties, overriding the endpoint configuration.

Vendor
Apache
Product
Camel
CVSS
LOW 3.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-06
Original CVE updated
2026-07-08
Advisory published
2026-07-06
Advisory updated
2026-07-08

Who should care

Users of Apache Camel, particularly those using the camel-mail component, should be aware of this vulnerability. The vulnerability affects Apache Camel versions from 4.0.0 before 4.14.8, from 4.15.0 before 4.18.3, and from 4.19.0 before 4.21.0.

Technical summary

The camel-mail producer (MailProducer.getSender) scanned the outgoing Exchange for message headers in the mail.smtp. / mail.smtps. namespace and, when any were present, built a per-message JavaMail sender with those values applied as JavaMail session properties, overriding the endpoint configuration. This namespace is Camel-internal - only MailProducer interprets it - and was not blocked by any HeaderFilterStrategy, so the values could originate from any inbound protocol (for example platform-http query parameters or request headers, or JMS / Kafka messages from untrusted producers) that feeds a route ending in an smtp / smtps producer without an intervening removeHeaders.

Defensive priority

Medium

Recommended defensive actions

  • Upgrade to version 4.21.0, which fixes the issue.
  • If users are on the 4.14.x LTS releases stream, then they are suggested to upgrade to 4.14.8.
  • If users are on the 4.18.x releases stream, then they are suggested to upgrade to 4.18.3.
  • For deployments that cannot upgrade immediately, strip the namespace before the mail producer with removeHeaders('mail.smtp.*') and removeHeaders('mail.smtps.*') between any untrusted ingress and the smtp / smtps.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record was published on 2026-07-06T09:16:36.927Z and was last modified on 2026-07-08T15:06:26.423Z. The NVD entry is currently Analyzed. Evidence is limited to public sources and may not reflect all affected systems or potential attack vectors. Defenders should verify system configurations, review logs for suspicious activity related to mail producers and smtp/smtps endpoints, and ensure proper mitigations are in place.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-06T09:16:36.927Z and has not been modified since then. The NVD entry is currently Analyzed.