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CVE-2026-109380— modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field

Quick assessment

Affected
ayuhito modern-tar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

modern-tar 0.3.5 至 0.8.5 版本存在一个内存耗尽漏洞。攻击者可通过 函数解析非八进制字节，生成负的条目大小，从而利用该漏洞。攻击者可构造一个可选经过 gzip 压缩的归档文件，并将其传入 函数。该函数会无限制地缓冲数据块，导致进程内存耗尽，并抑制后续条目的处理。

CVSS 7.5 · High EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
ayuhito modern-tar 0.3.5≤ 0.8.5 affected
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I. Basic Information for CVE-2026-109380

Vulnerability Information
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Vulnerability Title
modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ayuhito modern-tar 0.3.5 ~ 0.8.5 -

II. Public POCs for CVE-2026-109380

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-109380

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Patches & Fixes for CVE-2026-109380 (3)

Other References for CVE-2026-109380 (2)

IV. Related Vulnerabilities

Same weakness: CWE-1284

V. Comments for CVE-2026-109380

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