CVE-2026-71267 microtar Stack Buffer Overflow in mtar_write_file_header() and mtar_write_dir_header()
A stack buffer overflow in microtar allows attackers to execute arbitrary code or cause denial of service via crafted file names.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71267?
CVE-2026-71267 is a critical memory corruption vulnerability in rxi microtar, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-121
Which versions are affected by CVE-2026-71267?
How do I fix CVE-2026-71267?
No fix has been published for CVE-2026-71267 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-71267 being exploited?
There is no known exploitation of CVE-2026-71267 in the wild and no public exploit code.
Sources
Also known as GHSA-3h9h-4m9g-9m4r.