LowCVE-2026-15028

Libarchive: heap overflow oob read while parsing a tar archive contains a pax extended header (CVE-2026-15028)

Published 10.07.2026Last modified 09.10.2026Sources: Red Hat, Debian LTS, Ubuntu, BSI, CVE.org, Msrc Update Guide

What is affected, what to do

A flaw was found in libarchive. This vulnerability allows a remote attacker to trigger a heap overflow by providing a specially crafted tar archive.

Update Red Hat Enterprise Linux 10 to version 0:3.7.7-11.el10_2, Red Hat Cost Management On-Premise 1 to version 1791460851, Red Hat Hardened Images to version 3.8.8-2.1.hum1.

Affected: Red Hat Enterprise Linux 10 lt *..0:3.7.7-11.el10_2
Red Hat Cost Management On-Premise 1 lt *..1791460851
Red Hat Hardened Images lt *..3.8.8-2.1.hum1
Fixed in: Red Hat Enterprise Linux 10 0:3.7.7-11.el10_2
Red Hat Cost Management On-Premise 1 1791460851
Red Hat Hardened Images 3.8.8-2.1.hum1

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Metrics

3.9

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

3.9

CVSS v3

Severity Low on the scale from 0 to 10.

Source: Red Hat, Debian LTS, Ubuntu, BSI, CVE.org, Msrc Update Guide

0.2 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 10.4

Show all metrics

Severity: Low
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 40.80 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 3.9 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 3.9
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.2 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 10.4; Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 10.07.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 11 July 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-805

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

A flaw was found in libarchive. This vulnerability allows a remote attacker to trigger a heap overflow by providing a specially crafted tar archive. The issue occurs during the parsing of a PAX extended header containing a malformed SUN.holesdata sparse-file attribute. Successful exploitation could lead to a denial of service, making the system unavailable, or potentially allow for arbitrary code execution, giving the attacker control over the affected system.

Source: redhat_csaf, Debian LTS Advisories, Ubuntu Security Notices, BSI WID Portal, BSI CSAF, cvelistv5, Microsoft Security Update Guide, NVD (NIST)

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Red Hat	Red Hat Cost Management On-Premise 1	`< 1791460851`	`1791460851`
Red Hat	Red Hat Enterprise Linux 10	`< 0:3.7.7-11.el10_2`	`0:3.7.7-11.el10_2`
Red Hat	Red Hat Enterprise Linux 6	`—`	—
Red Hat	Red Hat Enterprise Linux 7	`—`	—
Red Hat	Red Hat Enterprise Linux 8	`—`	—
Red Hat	Red Hat Enterprise Linux 9	`—`	—
Red Hat	Red Hat Hardened Images	`< 3.8.8-2.1.hum1`	`3.8.8-2.1.hum1`
Red Hat	Red Hat OpenShift Container Platform 4	`—`	—

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	libarchive	`bookworm`
Linux	debian	libarchive	`bullseye`
Linux	ubuntu	libarchive	`focal`
Linux	ubuntu	libarchive	`jammy`
Linux	ubuntu	libarchive	`noble`
Linux	ubuntu	libarchive	`resolute`

Weakness classes (CWE)

CWE-805Buffer Access with Incorrect Length Value
Base
The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer.
Entry at MITRE CWE-805

References & sources

access.redhat.comRHSA-2026:38279Vendor advisory, x_refsource_REDHAT
access.redhat.comsecurity/cve/CVE-2026-15028Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2497970Issue tracking, x_refsource_REDHAT
github.comlibarchive/libarchive/issues/3251
github.comlibarchive/libarchive/pull/3253
access.redhat.comRHSA-2026:69553Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:79357Vendor advisory, x_refsource_REDHAT

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

09.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:79357

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/15xxx/CVE-2026-15028.json">CVE-2026-15028</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:79357