CVE-2026-111273 unarr through 1.1.1 Off-by-One Heap Buffer Overflow via tar_get_name
Attackers can crash the application by supplying a crafted TAR archive that triggers a heap buffer overflow in the unarr library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-111273?
CVE-2026-111273 is a medium-severity memory corruption vulnerability in selmf unarr, published on 15 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
unarr through 1.1.1 contains an off-by-one heap-based buffer overflow in tar_get_name() in tar/parse-tar.c, reachable through the ar_entry_get_name() API. Attackers can supply a crafted TAR archive with a full ustar prefix and name to write a NUL byte past the allocation, corrupting heap memory and crashing the process.
Weakness: CWE-193
Which versions are affected by CVE-2026-111273?
How do I fix CVE-2026-111273?
No fix has been published for CVE-2026-111273 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-2026-111273 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111273 exists.
Sources
Also known as DEBIAN-CVE-2026-111273, GHSA-2v49-qr2f-xxxp, UBUNTU-CVE-2026-111273.