# 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.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N`)
- **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:** Yes
- **Published:** 5 Jun 2026
- **Updated:** 5 Jun 2026
- **Also known as:** ALPINE-CVE-2026-48112, DEBIAN-CVE-2026-48112, ECHO-2815-a409-45da, MINI-gph3-h5cm-gww5, UBUNTU-CVE-2026-48112

## 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.

Weakness: CWE-190 (Integer Overflow or Wraparound), CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-48112?

It affects 1 product.


Products: 7-Zip 7-Zip.

## How do I fix CVE-2026-48112?

Upgrade to a fixed version.

## 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

- [CVE-2025-0411](https://insights.sbomify.com/CVE-2025-0411/): 7-Zip Mark of the Web Bypass (high 7.0, exploited in the wild)
- [CVE-2008-6536](https://insights.sbomify.com/CVE-2008-6536/): Other in n/a (critical 10.0)
- [CVE-2026-48095](https://insights.sbomify.com/CVE-2026-48095/): GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer under-allocation (high 8.8)
- [CVE-2018-10172](https://insights.sbomify.com/CVE-2018-10172/): Privilege escalation in n/a (high 8.8)
- [CVE-2016-2335](https://insights.sbomify.com/CVE-2016-2335/): Memory corruption in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48112 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-48112 in the wild and no public exploit code.

Affected product: mcmilk 7-Zip. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-48112/ (Markdown: https://insights.sbomify.com/CVE-2026-48112/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48112
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48112
- OSV: https://osv.dev/vulnerability/CVE-2026-48112

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48112/
Summaries are generated and may contain mistakes; the official description above is the record.