CVE-2026-109380
modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1284 |
| Vendor | ayuhito |
| Product | modern-tar |
| Published | Oct 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ayuhito / modern-tar
0.3.5 ≤ 0.8.5
References
github.com: https://github.com/ayuhito/modern-tar/pull/195 github.com: https://github.com/ayuhito/modern-tar/commit/181c8cb75351867535057817ada4802a90fe416e github.com: https://github.com/ayuhito/modern-tar/blob/v0.8.5/src/tar/encoding.ts github.com: https://github.com/ayuhito/modern-tar vulncheck.com: https://www.vulncheck.com/advisories/modern-tar-0.3.5-through-0.8.5-memory-exhaustion-via-malformed-octal-size-field
Credits
Lum Humolli