CVE-2026-55993: Apache Camel: Improper Input Validation, Exposure of Sensitive Information to an Unauthorized Actor, Server-Side Request Forgery
This Apache advisory covers CVE-2026-55993 in Apache Camel.
Key facts
- Vendor rating
- High, CVSS 7.5
- CISA KEV
- Not listed (catalogue checked )
- Affected
- 4.0.0 through 4.14.8; 4.15.0 through 4.18.3; 4.19.0 through 4.21.0.
- Fixed in
- 4.21.0, 4.14.8, 4.18.3
- Source published
- Source revised
- Listed by VulniPulse
- Record changed
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
Improper Input Validation, Exposure of Sensitive Information to an Unauthorized Actor, Server-Side Request Forgery (SSRF) vulnerability in Apache Camel in Atmosphere Websocket Component.
The camel-atmosphere-websocket consumer mapped inbound WebSocket query parameters into the Camel Exchange header map without applying any HeaderFilterStrategy (WebsocketConsumer.sendEventNotification() iterates the query-string map collected in WebsocketConsumer.service() and copies each entry into the Exchange).
Because nothing blocked the Camel header namespace, a client connecting to the WebSocket endpoint could set Camel-internal control headers - including CamelHttpUri (Exchange.HTTP_URI) - simply by supplying them as query parameters.
In a route where the WebSocket consumer feeds a downstream HTTP producer, the injected CamelHttpUri redirects the server-side HTTP request to an attacker-chosen destination (server-side request forgery - for example to an internal service or a cloud metadata endpoint).
In addition, the HTTP producer resolves Camel property placeholders on the resulting (attacker-controlled) URI, so placeholders embedded in the injected value - such as an environment-variable reference, an application property, or a vault reference - are resolved to their real values and sent to the attacker, disclosing environment variables, application properties and vault secrets.
Text from the source record.
- 4.0.0 through 4.14.8
- 4.15.0 through 4.18.3
- 4.19.0 through 4.21.0.
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-55993
Upgrade to a fixed release named by Apache:
- 4.21.0
- 4.14.8
- 4.18.3
Vendor guidance
- Users are recommended to 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.
- The fix makes the consumer apply the HeaderFilterStrategy it already inherits from the HTTP/servlet stack, filtering the Camel header namespace case-insensitively on inbound mapping, so externally-supplied Camel* / camel* headers are no longer copied into the Exchange.
- For deployments that cannot upgrade immediately, strip the Camel control headers from the inbound message before they reach any downstream producer (for example removeHeaders('Camel*') and removeHeaders('camel*') at the start of the route), require authentication on the WebSocket endpoint, and avoid bridging an untrusted consumer directly into an HTTP producer whose target URI can be driven from message headers.
CVE-2026-55993 in other vendors' advisories
- Apache: CVE-2026-71300
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