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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

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'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

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

cve-icon OpenCVE Enrichment

Updated: 2026-10-13T07:25:17Z

Weaknesses