CVE-2026-109380CWE-1284

CVE-2026-109380

High · published October 13, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
37.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · 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
EPSS
0.00446 · 37.8th percentile
Weakness
CWE-1284 · Improper Validation of Specified Quantity in Input
Published
2026-10-13T01:17Z
References (5)
https://github.com/ayuhito/modern-tar · [email protected]https://github.com/ayuhito/modern-tar/blob/v0.8.5/src/tar/encoding.ts · [email protected]https://github.com/ayuhito/modern-tar/commit/181c8cb75351867535057817ada4802a90fe416e · [email protected]https://github.com/ayuhito/modern-tar/pull/195 · [email protected]https://www.vulncheck.com/advisories/modern-tar-0.3.5-through-0.8.5-memory-exhaustion-via-malformed-octal-size-field · [email protected]
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 20:55Z
    modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field
    cvelistv5
  • 12 OCT 20:55Z
    modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field
    cvelistv5