CVE-2026-63073

Что произошло

Issue summary: OpenSSL CMP response validation passed an unexpected response sender distinguished name directly as the format string to `ERR_raise_data()`. Impact summary: A malicious or intercepted CMP endpoint can crash a CMP client that enforces an expected sender or uses a pinned server certificate whose subject becomes the default expected sender. CWE: CWE-134 (Use of Externally-Controlled Format String) Description: When validating a received CMP message, ossl_cmp_msg_check_update() converts the peer-supplied sender distinguished name with X509_NAME_oneline() and passes it directly as the format argument to ERR_raise_data(). Percent characters survive the conversion, so a sender DN such as "CN=%s%n" reaches BIO_vsnprintf() as an attacker-controlled format string with no matching variadic arguments. This path is only reached when the caller configures an expected sender or pins a server certificate, which is the normal configuration for a CMP client validating server responses. Since the attacker controls the format string but none of the variadic arguments, such specifiers as %s and %n dereference or write through unrelated stack contents and crash the client. The reliable consequence is a denial of service, when the response comes from a malicious or intercepted CMP endpoint. There is no controlled memory write, arbitrary-address read, or reliable path to remote code execution. FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.

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": "4.0.0",
  "lessThan": "4.0.2",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "3.6.0",
  "lessThan": "3.6.4",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "3.5.0",
  "lessThan": "3.5.8",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "3.4.0",
  "lessThan": "3.4.7",
  "versionType": "semver"
}

CVSS: оценки и векторы

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

Источники и ссылки

{
  "cwes": [
    "cve"
  ],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-04T21:18:59.677672+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T20:28:06.848933+00:00"
  },
  "scores": [
    "cve"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T20:28:06.848933+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T20:28:06.848933+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-04T21:18:59.677672+00:00"
  },
  "references": [
    "cve"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T20:28:06.848933+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены05.11.2026, 00:19
2. Данные обновлены04.11.2026, 00:14
3. Данные обновлены03.11.2026, 00:13
4. Данные обновлены02.11.2026, 00:12
5. Данные обновлены31.10.2026, 11:59
6. Данные обновлены29.10.2026, 12:35
7. Появились сведения об исправлении28.10.2026, 23:28

Личная заметка и статус

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