---
schema_version: '1.0'
id: security-20260705-f5242e
url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-45445
url_hash: f5242e3a5995b2872e9dd12d2e93b23434bbbdaf42b20895c0f2fdcf9dda5ad6
canonical_url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-45445
source: osv:debian
category: security/os
category_raw: cve/os
region: null
tags:
- cve
- DEBIAN-CVE-2026-45445
- severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- openssl
- Debian
lang: en
published_at: '2026-06-09T17:17:18Z'
fetched_at: '2026-07-05T15:34:34Z'
updated_at: '2026-07-05T15:36:30Z'
status: published
content_hash: 4758fd99c8f390cf3ac754ec16634cdd961cff9e60293d33af8e843ff6afd44d
license_note: full
summary: 'Issue summary: When an application drives an AES-OCB context through the
  public EVP_Cipher() one-shot interface, the application-supplied initialisation
  vector (IV) is silently discarded.  Impact summary: Every message encrypted under
  the same key uses the same effective nonce re'
summary_source: rss
summary_en: 'Issue summary: When an application drives an AES-OCB context through
  the public EVP_Cipher() one-shot interface, the application-supplied initialisation
  vector (IV) is silently discarded.  Impact summary: Every message encrypted under
  the same key uses the same effective nonce re'
entities: []
key_facts: []
related: []
related_auto: []
title: DEBIAN-CVE-2026-45445 — openssl
---

# DEBIAN-CVE-2026-45445 — openssl

## TL;DR
Issue summary: When an application drives an AES-OCB context through the public EVP_Cipher() one-shot interface, the application-supplied initialisation vector (IV) is silently discarded.  Impact summary: Every message encrypted under the same key uses the same effective nonce re

## Key Points
- cve / DEBIAN-CVE-2026-45445 / severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N / openssl / Debian

## Details
**Severity:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
**Advisory:** DEBIAN-CVE-2026-45445

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

**Details:**
Issue summary: When an application drives an AES-OCB context through the public EVP_Cipher() one-shot interface, the application-supplied initialisation vector (IV) is silently discarded.  Impact summary: Every message encrypted under the same key uses the same effective nonce regardless of the IV supplied by the caller, resulting in (key, nonce) reuse and loss of confidentiality.  If the same code path is used to compute the authentication tag, the tag depends only on the (key, IV) pair and not on the plaintext or ciphertext, allowing universal forgery of arbitrary ciphertext from a single captured message.  OpenSSL provides two ways to drive a cipher: the documented streaming interface (EVP_CipherUpdate / EVP_CipherFinal_ex) and a lower-level one-shot, EVP_Cipher(), whose documentation explicitly recommends against use by applications in favour of EVP_CipherUpdate() and EVP_CipherFinal_ex().  The OCB provider's streaming handler flushes the application-supplied IV into the OCB context before processing data; the one-shot handler did not.  Every call to EVP_Cipher() on an AES-OCB context therefore ran with the all-zero key-derived offset state left by cipher initialisation, regardless of the caller's IV.  If EVP_EncryptFinal_ex() is subsequently used to obtain the authentication tag, the deferred IV setup runs at that point and clears the running checksum that should have been accumulated over the plaintext.  The resulting tag is a function of (key, IV) only and verifies against any ciphertext produced under the same (key, IV) pair.  The OpenSSL SSL/TLS implementation is not affected: AES-OCB is not a TLS cipher suite, and libssl does not call EVP_Cipher() in any case. Applications that drive AES-OCB through the documented streaming AEAD API (EVP_CipherUpdate / EVP_CipherFinal_ex) are not affected.  Only applications that combine the AES-OCB cipher with the EVP_Cipher() one-shot API are vulnerable.  The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue, as AES-OCB is outside the OpenSSL FIPS module boundary.

**References:**
- https://security-tracker.debian.org/tracker/CVE-2026-45445

_Data: OSV.dev (upstream: debian) — https://osv.dev/vulnerability/DEBIAN-CVE-2026-45445_

## Source
元記事: [DEBIAN-CVE-2026-45445 — openssl](https://osv.dev/vulnerability/DEBIAN-CVE-2026-45445) — published 2026-06-09T17:17:18Z