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CVE-2026-5745— Libarchive: a null pointer dereference vulnerability exists in the acl parser of libarchive

Quick assessment

Affected
Red Hat Red Hat Hardened Images
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libarchive是libarchive开源的一款多格式存档和压缩库。 libarchive存在代码问题漏洞，该漏洞源于ACL解析逻辑存在空指针取消引用，可能导致处理恶意存档文件时应用程序崩溃和拒绝服务。

CVSS 5.5 · Medium EPSS 0.17% · P6

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat Hardened Images 3.8.7-1.hum1< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any affected
any affected
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I. Basic Information for CVE-2026-5745

Vulnerability Information
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Vulnerability Title
Libarchive: a null pointer dereference vulnerability exists in the acl parser of libarchive
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libarchive. A NULL pointer dereference vulnerability exists in the ACL parsing logic, specifically within the archive_acl_from_text_nl() function. When processing a malformed ACL string (such as a bare "d" or "default" tag without subsequent fields), the function fails to perform adequate validation before advancing the pointer. An attacker can exploit this by providing a maliciously crafted archive, causing an application utilizing the libarchive API (such as bsdtar) to crash, resulting in a Denial of Service (DoS).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
libarchive 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libarchive是libarchive开源的一款多格式存档和压缩库。 libarchive存在代码问题漏洞，该漏洞源于ACL解析逻辑存在空指针取消引用，可能导致处理恶意存档文件时应用程序崩溃和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Hardened Images 3.8.7-1.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-5745

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III. Intelligence Information for CVE-2026-5745

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Vendor Advisories for CVE-2026-5745 (1)

Same Patch Batch · Red Hat · 2026-04-07 · 4 CVEs total

CVE-2026-4631 9.8 CRITICAL Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument i
CVE-2026-4740 8.2 HIGH Rhacm: open cluster management (ocm): cross-cluster privilege escalation via improper kube
CVE-2025-14821 7.8 HIGH Libssh: libssh: insecure default configuration leads to local man-in-the-middle attacks on

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-476

V. Comments for CVE-2026-5745

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