CVE-2026-48112 GHSL-2026-122 7-Zip Ar SYMDEF OOB Read
A heap out-of-bounds read in 7-Zip's BSD SYMDEF parser allows attackers to read uninitialized heap data, potentially disclosing sensitive information.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-48112?
CVE-2026-48112 is a medium-severity memory corruption vulnerability in mcmilk 7-Zip, published on 5 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
7-Zip is a file archiver with a high compression ratio. Versions 9.18 through 26.00 contain a heap out-of-bounds read in 7-Zip Ar handler BSD SYMDEF parser. A 4-byte heap out-of-bounds read exists in the Unix ar archive parser in 7-Zip. When parsing a BSD-style __.SYMDEF symbol table, the ParseLibSymbols function reads a 32-bit namesSize field via Get32 at a position that can equal the buffer size, reading 4 bytes past the end of the heap allocation. This reads uninitialized heap data under the default allocator. Version 26.01 patches the issue.
Which versions are affected by CVE-2026-48112?
It affects 1 product.
Products include 7-Zip 7-Zip.
How do I fix CVE-2026-48112?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-48112 being exploited?
There is no known exploitation of CVE-2026-48112 in the wild and no public exploit code.
Other vulnerabilities in mcmilk 7-Zip
Sources
Also known as ALPINE-CVE-2026-48112, DEBIAN-CVE-2026-48112, ECHO-2815-a409-45da, MINI-gph3-h5cm-gww5, UBUNTU-CVE-2026-48112.