# CVE-2025-53816: GHSL-2025-058 - 7-Zip Multi-byte write heap buffer overflow in NCompress::NRar5::CDecoder

> A heap buffer overflow in the RAR5 handler allows attackers to cause memory corruption and denial of service via crafted archives.

- **Severity:** Medium 5.5 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Jul 2025
- **Updated:** 11 May 2026
- **Also known as:** DEBIAN-CVE-2025-53816, UBUNTU-CVE-2025-53816

## What is CVE-2025-53816?

CVE-2025-53816 is a medium-severity memory corruption vulnerability in ipavlov 7-Zip, published on 17 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

7-Zip is a file archiver with a high compression ratio. Zeroes written outside heap buffer in RAR5 handler may lead to memory corruption and denial of service in versions of 7-Zip prior to 25.0.0. Version 25.0.0 contains a fix for the issue.

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2025-53816?

It affects 1 product.


Products: 7-Zip 7-Zip.

## How do I fix CVE-2025-53816?

Upgrade to a fixed version.

## Is CVE-2025-53816 being exploited?

There is no known exploitation of CVE-2025-53816 in the wild and no public exploit code.

## Other vulnerabilities in ipavlov 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-2025-53816 and fix it if it is affected.

What it is: CVE-2025-53816 is a medium-severity memory corruption vulnerability in ipavlov 7-Zip, published on 17 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-53816 in the wild and no public exploit code.

Affected product: ipavlov 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-2025-53816/ (Markdown: https://insights.sbomify.com/CVE-2025-53816/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-53816
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-53816
- OSV: https://osv.dev/vulnerability/CVE-2025-53816

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-53816/
Summaries are generated and may contain mistakes; the official description above is the record.