Buffer overflow in Rxi Microtar

CVE-2026-71267

microtar's mtar_write_file_header and mtar_write_dir_header functions (src/microtar.c) copy a caller-supplied entry name into the 100-byte field of a stack-allocated mtar_header_t via strcpy(h.name, name), with no check that strlen(name) is less than 100 before the copy.

Vulnerability class: Buffer Overflow

EPSS: 0.003 (23.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-71267?
CVE-2026-71267 is a critical-severity vulnerability in Rxi Microtar, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-08-05.
How severe is CVE-2026-71267?
Critical severity. CVSS v3 base score is 9.8 out of 10.