---
schema_version: '1.0'
id: security-20260705-f31bc6
url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-28388
url_hash: f31bc6da4a3546547444861426e6ddfa162455273cd7fc841c730cc69a66a8a4
canonical_url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-28388
source: osv:debian
category: security/os
category_raw: cve/os
region: null
tags:
- cve
- DEBIAN-CVE-2026-28388
- 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: 8d637cae99aa543d9db07885b7be2847634793f65b233fec7e9115737e575a4f
license_note: full
summary: 'Issue summary: When a delta CRL that contains a Delta CRL Indicator extension
  is processed a NULL pointer dereference might happen if the required CRL Number
  extension is missing.  Impact summary: A NULL pointer dereference can trigger a
  crash which leads to a Denial of Service f'
summary_source: rss
summary_en: 'Issue summary: When a delta CRL that contains a Delta CRL Indicator extension
  is processed a NULL pointer dereference might happen if the required CRL Number
  extension is missing.  Impact summary: A NULL pointer dereference can trigger a
  crash which leads to a Denial of Service f'
entities: []
key_facts: []
related: []
related_auto: []
title: DEBIAN-CVE-2026-28388 — openssl
---

# DEBIAN-CVE-2026-28388 — openssl

## TL;DR
Issue summary: When a delta CRL that contains a Delta CRL Indicator extension is processed a NULL pointer dereference might happen if the required CRL Number extension is missing.  Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service f

## Key Points
- cve / DEBIAN-CVE-2026-28388 / 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-2026-28388

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

**Details:**
Issue summary: When a delta CRL that contains a Delta CRL Indicator extension is processed a NULL pointer dereference might happen if the required CRL Number extension is missing.  Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service for an application.  When CRL processing and delta CRL processing is enabled during X.509 certificate verification, the delta CRL processing does not check whether the CRL Number extension is NULL before dereferencing it. When a malformed delta CRL file is being processed, this parameter can be NULL, causing a NULL pointer dereference.  Exploiting this issue requires the X509_V_FLAG_USE_DELTAS flag to be enabled in the verification context, the certificate being verified to contain a freshestCRL extension or the base CRL to have the EXFLAG_FRESHEST flag set, and an attacker to provide a malformed CRL to an application that processes it.  The vulnerability is limited to Denial of Service and cannot be escalated to achieve code execution or memory disclosure. For that reason the issue was assessed as Low severity according to our Security Policy.  The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

**References:**
- https://security-tracker.debian.org/tracker/CVE-2026-28388

_Data: OSV.dev (upstream: debian) — https://osv.dev/vulnerability/DEBIAN-CVE-2026-28388_

## Source
元記事: [DEBIAN-CVE-2026-28388 — openssl](https://osv.dev/vulnerability/DEBIAN-CVE-2026-28388) — published 2026-04-07T22:16:20Z