---
schema_version: '1.0'
id: security-20260705-0d61a0
url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-28386
url_hash: 0d61a0a13e0c03f86112d0beef67fa62022461c7393906ece2ce52c8ec31332b
canonical_url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-28386
source: osv:debian
category: security/os
category_raw: cve/os
region: null
tags:
- cve
- DEBIAN-CVE-2026-28386
- severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- openssl
- Debian
lang: en
published_at: '2026-04-07T22:16:20Z'
fetched_at: '2026-07-05T15:34:34Z'
updated_at: '2026-07-05T15:36:29Z'
status: published
content_hash: 6750c7483e4c0f75eadcad6761645b080fa5a8c4a6120253d0066f5a379d5973
license_note: full
summary: 'Issue summary: Applications using AES-CFB128 encryption or decryption on
  systems with AVX-512 and VAES support can trigger an out-of-bounds read of up to
  15 bytes when processing partial cipher blocks.  Impact summary: This out-of-bounds
  read may trigger a crash which leads to De'
summary_source: rss
summary_en: 'Issue summary: Applications using AES-CFB128 encryption or decryption
  on systems with AVX-512 and VAES support can trigger an out-of-bounds read of up
  to 15 bytes when processing partial cipher blocks.  Impact summary: This out-of-bounds
  read may trigger a crash which leads to De'
entities: []
key_facts: []
related: []
related_auto: []
title: DEBIAN-CVE-2026-28386 — openssl
---

# DEBIAN-CVE-2026-28386 — openssl

## TL;DR
Issue summary: Applications using AES-CFB128 encryption or decryption on systems with AVX-512 and VAES support can trigger an out-of-bounds read of up to 15 bytes when processing partial cipher blocks.  Impact summary: This out-of-bounds read may trigger a crash which leads to De

## Key Points
- cve / DEBIAN-CVE-2026-28386 / severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H / openssl / Debian

## Details
**Severity:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
**Advisory:** DEBIAN-CVE-2026-28386

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

**Details:**
Issue summary: Applications using AES-CFB128 encryption or decryption on systems with AVX-512 and VAES support can trigger an out-of-bounds read of up to 15 bytes when processing partial cipher blocks.  Impact summary: This out-of-bounds read may trigger a crash which leads to Denial of Service for an application if the input buffer ends at a memory page boundary and the following page is unmapped. There is no information disclosure as the over-read bytes are not written to output.  The vulnerable code path is only reached when processing partial blocks (when a previous call left an incomplete block and the current call provides fewer bytes than needed to complete it). Additionally, the input buffer must be positioned at a page boundary with the following page unmapped. CFB mode is not used in TLS/DTLS protocols, which use CBC, GCM, CCM, or ChaCha20-Poly1305 instead. For these reasons the issue was assessed as Low severity according to our Security Policy.  Only x86-64 systems with AVX-512 and VAES instruction support are affected. Other architectures and systems without VAES support use different code paths that are not affected.  OpenSSL FIPS module in 3.6 version is affected by this issue.

**References:**
- https://security-tracker.debian.org/tracker/CVE-2026-28386

_Data: OSV.dev (upstream: debian) — https://osv.dev/vulnerability/DEBIAN-CVE-2026-28386_

## Source
元記事: [DEBIAN-CVE-2026-28386 — openssl](https://osv.dev/vulnerability/DEBIAN-CVE-2026-28386) — published 2026-04-07T22:16:20Z