CVE-2026-109380
modern-tar 0.3.5 through 0.8.5 contains a memory exhaustion vulnerability that allows attackers to…
- Risk score
- 58/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 12 Oct 2026
Open in the live forecast Today's forecast
What to know
- 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 s…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.5 high
- Remotely exploitable without logging in
References
- https://github.com/ayuhito/modern-tar
- https://github.com/ayuhito/modern-tar/blob/v0.8.5/src/tar/encoding.ts
- https://github.com/ayuhito/modern-tar/commit/181c8cb75351867535057817ada4802a90fe416e
- https://github.com/ayuhito/modern-tar/pull/195
- https://www.vulncheck.com/advisories/modern-tar-0.3.5-through-0.8.5-memory-exhaustion-via-malformed-octal-size-field
Original 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.
Last activity 12 Oct 2026. Patch Forecast updates every hour.