libarchive RAR5 Decompression archive_read_data infinite loop

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in libarchive. This affects the function archive_read_data of the component RAR5 Decompression Handler. Performing a manipulation results in infinite loop. This vulnerability is cataloged as CVE-2026-4111. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in libarchive (version now known). It has been classified as problematic. This affects the function archive_read_data of the component RAR5 Decompression Handler. The manipulation with an unknown input leads to a infinite loop vulnerability. CWE is classifying the issue as CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. This is going to have an impact on availability. The summary by CVE is:

A flaw was identified in the RAR5 archive decompression logic of the libarchive library, specifically within the archive_read_data() processing path. When a specially crafted RAR5 archive is processed, the decompression routine may enter a state where internal logic prevents forward progress. This condition results in an infinite loop that continuously consumes CPU resources. Because the archive passes checksum validation and appears structurally valid, affected applications cannot detect the issue before processing. This can allow attackers to cause persistent denial-of-service conditions in services that automatically process archives.

It is possible to read the advisory at access.redhat.com. This vulnerability is uniquely identified as CVE-2026-4111 since 03/13/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 302158 (Linux Distros Unpatched Vulnerability : CVE-2026-4111), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (302158), EUVD (EUVD-2026-12031) and CERT Bund (WID-SEC-2026-0785). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • Oracle Linux
  • RESF Rocky Linux
  • Open Source libarchive
  • Red Hat OpenShift

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (redhat): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 302158
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-4111

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/13/2026 Advisory disclosed
03/13/2026 +0 days CVE reserved
03/13/2026 +0 days VulDB entry created
04/29/2026 +47 days VulDB entry last update

Sourcesinfo

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2026-4111 (🔒)
GCVE (CVE): GCVE-0-2026-4111
GCVE (VulDB): GCVE-100-350979
EUVD: 🔒
CERT Bund: WID-SEC-2026-0785 - libarchive: Schwachstelle ermöglicht Denial of Service

Entryinfo

Created: 03/13/2026 14:07
Updated: 04/29/2026 20:08
Changes: 03/13/2026 14:07 (62), 03/13/2026 15:50 (1), 03/16/2026 10:01 (2), 03/20/2026 04:11 (7), 03/20/2026 21:02 (1), 03/27/2026 13:49 (1), 04/29/2026 20:08 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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