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TI-2026-71283 Aliases CVE-2026-109380GHSA-m6wr-6wgx-82mm

Memory exhaustion in modern-tar via malformed octal size field

Priority MEDIUM 44CWE-1284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

modern-tar from 0.3.5 through 0.8.5 parses size fields containing bytes that are not octal digits in readOctal(), which yields negative entry sizes (CWE-1284). An unauthenticated remote attacker can supply a crafted archive, optionally gzip-compressed, to unpackTar() that buffers chunks indefinitely, exhausting process memory and suppressing later entries.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00446 39th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ayuhitomodern-tar0.3.5 – 0.8.5—No fix listedCNA
  • modern-tar Vendorayuhito Affected 0.3.5 – 0.8.5 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for modern-tar.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 3 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109380
  2. 2026-10-13 Alias added: GHSA-m6wr-6wgx-82mm
  3. 2026-10-13 Affected versions changed · Red Hat
  4. 2026-10-13 CVSS score added · Red Hat
  5. 2026-10-13 CISA SSVC decision points changed

References

Patch 2

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences