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CVE-2026-19879

🗓️ 14 Aug 2026 14:51:36Reported by redhatType 
cve
 cve
🔗 web.nvd.nist.gov👁 5 Views

Undertow writeString() silently narrows Unicode to bytes in HTTP response headers, enabling truncation and information disclosure.

Related
Affected
Refs
[
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  },
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  },
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    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 10",
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    "packageName": "moditect",
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  },
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    "vendor": "Red Hat",
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    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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  },
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  },
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  },
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    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
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  },
  {
    "vendor": "Red Hat",
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    "vendor": "Red Hat",
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    "packageName": "undertow-servlet",
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    "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",
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      "cpe:/a:redhat:jboss_enterprise_application_platform:8"
    ]
  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
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  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat Single Sign-On 7",
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    "defaultStatus": "affected",
    "cpes": [
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    ]
  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat Single Sign-On 7",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "packageName": "undertow-servlet",
    "defaultStatus": "affected",
    "cpes": [
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    ]
  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat Single Sign-On 7",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "packageName": "undertow-websockets-jsr",
    "defaultStatus": "affected",
    "cpes": [
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    ]
  }
]

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14 Aug 2026 15:17Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.15.3
5