{"cve":"CVE-2026-56139","nvd":{"published":"2026-07-06T09:16:39.157","modified":"2026-07-09T03:03:18.000","status":"Analyzed","description":"Generation of Error Message Containing Sensitive Information vulnerability in Apache Camel Undertow Component.\n\nThe camel-undertow HTTP server consumer exposes a muteException option that controls what is returned to the client when a route processing error occurs. This option defaulted to false, whereas the other Camel HTTP server components (camel-http / camel-jetty / camel-servlet and camel-platform-http) default it to true. With muteException=false, when a request triggers an exception during route processing the consumer writes the full Throwable stack trace into the HTTP response body as text/plain instead of returning an empty body. Any unauthenticated client that can reach the endpoint and cause a processing error - for example by sending a malformed request body, an invalid parameter, or otherwise triggering a route-internal failure - therefore receives a complete Java stack trace. Such a stack trace can disclose sensitive internal information, including credentials embedded in exception messages, internal host names and IP addresses, filesystem paths, dependency and version details, database and class names, and the application's internal structure, which an attacker can use to plan further attacks. In addition, for Rest DSL consumers the muteException option was not honoured at all: the RestUndertowHttpBinding was created with a hard-coded false, so the stack trace was returned even when muteException=true had been configured.\nThis issue affects Apache Camel: from 4.0.0 before 4.14.8, from 4.15.0 before 4.18.3, from 4.19.0 before 4.21.0.\n\nUsers 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. For deployments that cannot upgrade immediately, set muteException=true explicitly on the camel-undertow consumer (for example undertow: http://0.0.0.0:8080/api?muteException=true , or globally via the camel.component.undertow.mute-exception=true property), so that processing errors no longer return the stack trace to the client; note that on affected releases this workaround does not cover Rest DSL consumers, whose binding ignores the option until the fix is applied.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-209"],"references":["https://camel.apache.org/security/CVE-2026-56139.html","http://www.openwall.com/lists/oss-security/2026/07/05/29"],"products":["apache:camel"],"source":"nvd","synced_at":"2026-10-19T22:42:16.820116992+00:00"},"epss":{"cve":"CVE-2026-56139","score":0.00574,"percentile":0.47418,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-hjg2-f45w-c566","url":"https://osv.dev/vulnerability/GHSA-hjg2-f45w-c566","summary":"Apache Camel-Undertow: The muteException consumer option defaulted to false, so a processing error returned the full Java stack trace in the HTTP response body","modified":"2026-08-28T20:25:39.018392Z","packages":[{"ecosystem":"Maven","name":"org.apache.camel:camel-undertow","purl":"pkg:maven/org.apache.camel/camel-undertow","ranges":[">=4.0.0 <4.14.8"],"fixed":["4.14.8"]},{"ecosystem":"Maven","name":"org.apache.camel:camel-undertow","purl":"pkg:maven/org.apache.camel/camel-undertow","ranges":[">=4.15.0 <4.18.3"],"fixed":["4.18.3"]},{"ecosystem":"Maven","name":"org.apache.camel:camel-undertow","purl":"pkg:maven/org.apache.camel/camel-undertow","ranges":[">=4.19.0 <4.21.0"],"fixed":["4.21.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}