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ALPINE-CVE-2026-34182

Type: advisorySource: OSV1 source record

Issue Summary: Cryptographic Message Services (CMS) processing fails to perform sufficient input validation on the cipher and tag length fields of AuthEnvelopedData containers, leading to various potential compromises. Impact Summary: Attackers making use of these vulnerabilities may achieve key-equivalent functionality for a given CMS recipient and/or bypass integrity validation for a given message. In one use case, an attacker may send a CMS message containing AuthEnvelopedData with the cipher specified as a non-AEAD cipher. OpenSSL erroneously allows this selection, and attempts to decrypt and validate the message. An on-path attacker who captures one legitimate AES-GCM AuthEnvelopedData addressed to the victim can re-emit it with the recipientInfos set left byte-for-byte intact, so the victim's private key still unwraps the genuine CEK (the content-encryption key), but with the inner OID rewritten to AES-256-OFB (Output Feedback Mode, an unauthenticated keystream mode) and with an attacker-chosen IV and ciphertext. The victim initializes AES-256-OFB under the real CEK, never consults the MAC field, and CMS_decrypt() returns success. If the application under attack responds to the attacker with any indicator showing success or failure of the decryption effort, it is possible for the attacker to use this as an oracle to obtain key equivalent functionality for the CEK used for the chosen recipient of the message. In another use case, an attacker can reduce the tag length of

Announced Source revision 1
Original source ↗

ALPINE-CVE-2026-34182

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:ALPINE-CVE-2026-34182

openssl

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
3.3.7-r1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

openssl

Source reference: /affected/1/package/name

Affected versions
Not stated in this record
Fixed versions
3.5.7-r0

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

openssl

Source reference: /affected/2/package/name

Affected versions
Not stated in this record
Fixed versions
3.5.7-r0

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

openssl

Source reference: /affected/3/package/name

Affected versions
Not stated in this record
Fixed versions
3.5.7-r0

Source reference: /affected/3/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "3.0.0"
          },
          {
            "fixed": "3.3.7-r1"
          }
        ]
      }
    ],
    "package": {
      "name": "openssl",
      "purl": "pkg:apk/alpine/openssl?arch=source",
      "ecosystem": "Alpine:v3.21"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-34182.json"
    },
    "ecosystem_specific": {}
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "3.0.0"
          },
          {
            "fixed": "3.5.7-r0"
          }
        ]
      }
    ],
    "package": {
      "name": "openssl",
      "purl": "pkg:apk/alpine/openssl?arch=source",
      "ecosystem": "Alpine:v3.22"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-34182.json"
    },
    "ecosystem_specific": {}
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "3.0.0"
          },
          {
            "fixed": "3.5.7-r0"
          }
        ]
      }
    ],
    "package": {
      "name": "openssl",
      "purl": "pkg:apk/alpine/openssl?arch=source",
      "ecosystem": "Alpine:v3.23"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-34182.json"
    },
    "ecosystem_specific": {}
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "3.0.0"
          },
          {
            "fixed": "3.5.7-r0"
          }
        ]
      }
    ],
    "package": {
      "name": "openssl",
      "purl": "pkg:apk/alpine/openssl?arch=source",
      "ecosystem": "Alpine:v3.24"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-34182.json"
    },
    "ecosystem_specific": {}
  }
]

Publisher severity

No explicit severity was provided.

Event
#54294 · Revision 1
Added to Heist Feed
Publisher date
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