CVE-2026-34831

Что произошло

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Files#fail sets the Content-Length response header using String#size instead of String#bytesize. When the response body contains multibyte UTF-8 characters, the declared Content-Length is smaller than the number of bytes actually sent on the wire. Because Rack::Files reflects the requested path in 404 responses, an attacker can trigger this mismatch by requesting a non-existent path containing percent-encoded UTF-8 characters. This results in incorrect HTTP response framing and may cause response desynchronization in deployments that rely on the incorrect Content-Length value. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "< 2.2.23"
}

{
  "status": "affected",
  "version": ">= 3.0.0.beta1, < 3.1.21"
}

{
  "status": "affected",
  "version": ">= 3.2.0, < 3.2.6"
}

CVSS: оценки и векторы

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Источники и ссылки

{
  "cwes": [
    "cve"
  ],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-02T21:12:24.236052+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T21:14:18.643288+00:00"
  },
  "scores": [
    "cve"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T21:14:18.643288+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T21:14:18.643288+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-02T21:12:24.236052+00:00"
  },
  "references": [
    "cve"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T21:14:18.643288+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены03.11.2026, 00:12
2. Данные обновлены31.10.2026, 11:58
3. Данные обновлены29.10.2026, 12:24
4. Опубликована29.10.2026, 00:14

Личная заметка и статус

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