CVE-Katalog

CVE-2026-19879

DEBIAN-

[CVE-Katalog]

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.

Schweregrad
Medium · CVSS 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.39% · Oct 27, 2026

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / releasePackageVersionStatusSource
Debian14undertow1.3.11-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.16-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.19-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.21-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.23-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.4-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.5-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.7-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.0-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.1-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.18-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.20-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]

Showing 12 observations. All 56 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
Debian14undertow1.3.11-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.16-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.19-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.21-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.23-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.4-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.5-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.3.7-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.0-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.1-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.18-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.20-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.21-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.21-2UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.22-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.23-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.23-2UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.23-3UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.25-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.25-2UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.3-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.4-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.6-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.7-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow1.4.8-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.0.23-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.0.25-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.0.26-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.0.27-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.0.28-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.0.29-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.0.30-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.1.0-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.1.1-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.1.3-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.0-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.10-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.12-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.13-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.14-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.16-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.17-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.18-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.19-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.2-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.20-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.21-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.3-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.4-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.5-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.2.8-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.3.18-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.3.18-2UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.3.20-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.3.8-1UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Debian14undertow2.3.8-2UnknownSource applicability is not established[DEBIAN-CVE-2026-19879]
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "undertow",
      "distro": "debian",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "14",
      "versions": [
        "1.3.11-1",
        "1.3.16-1",
        "1.3.19-1",
        "1.3.21-1",
        "1.3.23-1",
        "1.3.4-1",
        "1.3.5-1",
        "1.3.7-1",
        "1.4.0-1",
        "1.4.1-1",
        "1.4.18-1",
        "1.4.20-1",
        "1.4.21-1",
        "1.4.21-2",
        "1.4.22-1",
        "1.4.23-1",
        "1.4.23-2",
        "1.4.23-3",
        "1.4.25-1",
        "1.4.25-2",
        "1.4.3-1",
        "1.4.4-1",
        "1.4.6-1",
        "1.4.7-1",
        "1.4.8-1",
        "2.0.23-1",
        "2.0.25-1",
        "2.0.26-1",
        "2.0.27-1",
        "2.0.28-1",
        "2.0.29-1",
        "2.0.30-1",
        "2.1.0-1",
        "2.1.1-1",
        "2.1.3-1",
        "2.2.0-1",
        "2.2.10-1",
        "2.2.12-1",
        "2.2.13-1",
        "2.2.14-1",
        "2.2.16-1",
        "2.2.17-1",
        "2.2.18-1",
        "2.2.19-1",
        "2.2.2-1",
        "2.2.20-1",
        "2.2.21-1",
        "2.2.3-1",
        "2.2.4-1",
        "2.2.5-1",
        "2.2.8-1",
        "2.3.18-1",
        "2.3.18-2",
        "2.3.20-1",
        "2.3.8-1",
        "2.3.8-2"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-19879",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "DEBIAN-CVE-2026-19879",
      "provider_updated_at": "2026-10-01T03:02:30.146378542Z",
      "applicability_unknown": true
    }
  ]
}

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Referenzen

[FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]