{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-19879", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-08-14T14:26:12.605Z", "datePublished": "2026-08-14T14:51:36.106Z", "dateUpdated": "2026-08-14T18:06:23.158Z" }, "containers": { "cna": { "title": "Io.undertow/undertow: undertow: http response header integrity issue due to character truncation", "metrics": [ { "other": { "content": { "value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1" }, "format": "CVSS" } ], "descriptions": [ { "lang": "en", "value": "A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The `writeString()` method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific Unicode characters in user-controlled input that an application places into response headers. This can lead to the truncation of these characters into ASCII control characters or special symbols, potentially resulting in limited integrity impact or information disclosure if the application does not properly sanitize user input." } ], "affected": [ { "vendor": "Red Hat", "product": "Red Hat build of Apache Camel for Spring Boot 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:camel_spring_boot:4" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Apache Camel for Spring Boot 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-parent", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:camel_spring_boot:4" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Apache Camel for Spring Boot 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-servlet", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:camel_spring_boot:4" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Apache Camel for Spring Boot 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-websockets-jsr", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:camel_spring_boot:4" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "moditect", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:10" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "pki-core:10.6/resteasy", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "pki-deps:10.6/resteasy", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "resteasy", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "jboss-eap-7/eap74-els-openjdk11-openshift-rhel8", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "jboss-eap-7/eap74-els-openjdk17-openshift-rhel8", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "jboss-eap-7/eap74-els-openjdk8-openshift-rhel8", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-parent", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-servlet", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-websockets-jsr", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 8", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:8" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 8", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-servlet", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:8" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 8", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-websockets-jsr", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:8" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jbosseapxp" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-servlet", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jbosseapxp" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-websockets-jsr", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jbosseapxp" ] }, { "vendor": "Red Hat", "product": "Red Hat Single Sign-On 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:red_hat_single_sign_on:7" ] }, { "vendor": "Red Hat", "product": "Red Hat Single Sign-On 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": 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Undertow should implement robust input validation and sanitization for all user-controlled data before it is placed into HTTP response headers. It is recommended to restrict header values to printable ASCII characters (0x20–0x7E) at the application level. Where available, use framework-provided header-safe encoding mechanisms to ensure proper handling of special characters." } ], "timeline": [ { "lang": "en", "time": "2026-08-14T14:14:58.978Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-08-14T14:35:09.145Z", "value": "Made public." } ], "providerMetadata": { "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-08-14T14:51:36.106Z" }, "x_generator": { "engine": "cvelib 1.8.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-08-14T17:41:34.677014Z", "id": "CVE-2026-19879", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-14T18:06:23.158Z" } } ] } }