{"id":"CVE-2026-109380","title":"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()","summary":"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, archiv…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-1284"],"vendor":"ayuhito","product":"modern-tar","affected":["modern-tar >= 0.3.5 <= 0.8.5"],"published":"2026-10-12","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:18:44.867","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109380","references":[{"url":"https://github.com/ayuhito/modern-tar","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ayuhito/modern-tar/blob/v0.8.5/src/tar/encoding.ts","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ayuhito/modern-tar/commit/181c8cb75351867535057817ada4802a90fe416e","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ayuhito/modern-tar/pull/195","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/modern-tar-0.3.5-through-0.8.5-memory-exhaustion-via-malformed-octal-size-field","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"epss":0.00446,"epssPercentile":0.38624,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-13T15:39:56.714376Z"},"ingestedAt":"2026-10-12T22:05:40.355Z","slug":"CVE-2026-109380","body":"## Overview\n\nmodern-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}