CVE-2026-109380modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field
Updated under an hour ago ()
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It affects ayuhito modern-tar. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.45%, higher than 37% of scored CVEs.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-1284
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.45% (percentile 37)
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 13, 2026
- First seen by InfoSec Signals
- Oct 12, 2026
Affected products
ayuhito modern-tar ayuhito:modern_tar (from the name) | from 0.3.5 through 0.8.5 | CNA record |
References
- https://github.com/ayuhito/modern-tar/pull/195issue-tracking, patch
- https://github.com/ayuhito/modern-tar/commit/181c8cb75351867535057817ada4802a90fe416epatch
- https://github.com/ayuhito/modern-tar/blob/v0.8.5/src/tar/encoding.tstechnical-description
- https://github.com/ayuhito/modern-tarproduct
- https://www.vulncheck.com/advisories/modern-tar-0.3.5-through-0.8.5-memory-exhaustion-via-malformed-octal-size-fieldthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.