modern-tar 0.3.5 through 0.8.5 contains a memory exhaustion vulnerability that allows attackers to produce negative entry sizes via non-octal bytes parsed by readOctal(). Attackers can supply a crafted, optionally gzip-compressed, archive to unpackTar() that buffers chunks indefinitely, exhausting process memory and suppressing later entries.
History

Tue, 13 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 13 Oct 2026 07:45:00 +0000

Type Values Removed Values Added
First Time appeared Ayuhito
Ayuhito modern-tar
Vendors & Products Ayuhito
Ayuhito modern-tar

Tue, 13 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

threat_severity

Important


Mon, 12 Oct 2026 21:00:00 +0000

Type Values Removed Values Added
Description modern-tar 0.3.5 through 0.8.5 contains a memory exhaustion vulnerability that allows attackers to produce negative entry sizes via non-octal bytes parsed by readOctal(). Attackers can supply a crafted, optionally gzip-compressed, archive to unpackTar() that buffers chunks indefinitely, exhausting process memory and suppressing later entries.
Title modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field
Weaknesses CWE-1284
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-12T20:55:11.774Z

Updated: 2026-10-13T15:40:11.463Z

Reserved: 2026-10-12T14:23:25.691Z

Link: CVE-2026-109380

cve-icon Vulnrichment

Updated: 2026-10-13T15:40:06.033Z

cve-icon NVD

Status : Deferred

Published: 2026-10-12T21:17:11.153

Modified: 2026-10-16T19:18:44.867

Link: CVE-2026-109380

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-12T20:55:11Z

Links: CVE-2026-109380 - Bugzilla