What is CVE-2026-43623?

CVE-2026-43623 is a high-severity vulnerability in Rxi Microtar, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-06-01.

How severe is CVE-2026-43623?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Rxi Microtar

CVE-2026-43623

microtar through 0.1.0 contains a stack-based buffer overflow vulnerability in the raw_to_header() function in src/microtar.c that allows attackers to corrupt adjacent stack memory by supplying a crafted TAR archive with non-null-terminate…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (11.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Rxi Microtar — versions 0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-43623?: CVE-2026-43623 is a high-severity vulnerability in Rxi Microtar, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-06-01.
How severe is CVE-2026-43623?: High severity. CVSS v3 base score is 8.8 out of 10.