CVE-2026-109380
modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field
- State
- Published
- Severity
- 8.7 High
- Published
- Oct 12, 2026
- Updated
- Oct 13, 2026
- Reserved
- Oct 12, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-1284 Improper Validation of Specified Quantity in Input
Affected Products
| Product | Versions |
|---|---|
modern-tarayuhito |
|
References
- GitHub Pull Request #195issue-trackingpatch
- Patch Commitpatch
- Vulnerable code in encoding.tstechnical-description
- https://github.com/ayuhito/modern-tarproduct
- VulnCheck Advisory: modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Fieldthird-party-advisory
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