# CVE-2025-26790: Memory corruption in Atlant

> Remote attackers can cause a denial of service in WithSecure Atlant via an out-of-bounds memory read during document processing.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-28x7-ppgv-4277

## What is CVE-2025-26790?

CVE-2025-26790 is a low-severity memory corruption vulnerability in WithSecure Atlant, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Withsecure Atlant with Capricorn engine before 2025-01-20_02 allows a Remote Denial of Service via an out-of-bounds memory read during processing of a document file by the antivirus engine.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2025-26790?


## How do I fix CVE-2025-26790?

No fix has been published for CVE-2025-26790 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-26790 being exploited?

There is no known exploitation of CVE-2025-26790 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-26790 and fix it if it is affected.

What it is: CVE-2025-26790 is a low-severity memory corruption vulnerability in WithSecure Atlant, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-26790 in the wild and no public exploit code.

Affected product: WithSecure Atlant. 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-2025-26790/ (Markdown: https://insights.sbomify.com/CVE-2025-26790/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-26790
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-26790
- OSV: https://osv.dev/vulnerability/CVE-2025-26790

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-26790/
Summaries are generated and may contain mistakes; the official description above is the record.