---
schema_version: '1.0'
id: security-20260705-496239
url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-34182
url_hash: 4962392e58c758ae786c58b199b8ba9fab03dbae12532f9d1e4311abd06ee0c5
canonical_url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-34182
source: osv:debian
category: security/os
category_raw: cve/os
region: null
tags:
- cve
- DEBIAN-CVE-2026-34182
- severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- openssl
- Debian
lang: en
published_at: '2026-06-09T17:17:04Z'
fetched_at: '2026-07-05T15:34:34Z'
updated_at: '2026-07-05T15:36:30Z'
status: published
content_hash: 1b9897d4d8a0b078f58da8fd3fa2d72c9e8ded0ad64a690def2720e21e86da76
license_note: full
summary: '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 vulnerabilitie'
summary_source: rss
summary_en: '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 vulnerabilitie'
entities: []
key_facts: []
related: []
related_auto: []
title: DEBIAN-CVE-2026-34182 — openssl
---

# DEBIAN-CVE-2026-34182 — openssl

## TL;DR
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 vulnerabilitie

## Key Points
- cve / DEBIAN-CVE-2026-34182 / severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N / openssl / Debian

## Details
**Severity:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
**Advisory:** DEBIAN-CVE-2026-34182

**Affected (your watchlist):**
- `Debian:openssl` 3.0.11-1~deb12u2 → no fixed version listed [rpi]

**Details:**
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 the chosen AEAD cipher for a given AuthEnvelopedData container to be a single byte long, allowing an attacker to brute force CMS decryption, producing an integrity bypass for applications that trust CMS_decrypt() to reject modified content.  The FIPS modules are not affected by this issue.

**References:**
- https://security-tracker.debian.org/tracker/CVE-2026-34182

_Data: OSV.dev (upstream: debian) — https://osv.dev/vulnerability/DEBIAN-CVE-2026-34182_

## Source
元記事: [DEBIAN-CVE-2026-34182 — openssl](https://osv.dev/vulnerability/DEBIAN-CVE-2026-34182) — published 2026-06-09T17:17:04Z