Is CVE-2026-109380 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-109380?

CVE-2026-109380 has a CVSS v3 severity of HIGH (7.5).

Back

CVE-2026-109380

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.