# CVE-2019-25364: Win10 MailCarrier 2.51 - 'POP3 User' Remote Buffer Overflow

> Remote attackers can execute arbitrary code on Win10 MailCarrier by sending a crafted oversized buffer to the POP3 service.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Feb 2026
- **Updated:** 28 Jul 2026
- **Also known as:** GHSA-jm9g-c5gq-m5v9

## What is CVE-2019-25364?

CVE-2019-25364 is a critical memory corruption vulnerability in TABS Laboratories Corporation Win10 MailCarrier, published on 18 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

MailCarrier 2.51 contains a buffer overflow vulnerability in the POP3 USER command that allows remote attackers to execute arbitrary code. Attackers can send a crafted oversized buffer to the POP3 service, overwriting memory and potentially gaining remote system access.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2019-25364?

It affects 1 product.


Products: Tabslab Mailcarrier.

## How do I fix CVE-2019-25364?

No fix has been published for CVE-2019-25364 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-25364 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25364 exists.

## Other vulnerabilities in TABS Laboratories Corporation Win10 MailCarrier

- [CVE-2019-11682](https://insights.sbomify.com/CVE-2019-11682/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-11395](https://insights.sbomify.com/CVE-2019-11395/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-25646](https://insights.sbomify.com/CVE-2019-25646/): Tabs Mail Carrier 2.5.1 Buffer Overflow via MAIL FROM (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-25364 and fix it if it is affected.

What it is: CVE-2019-25364 is a critical memory corruption vulnerability in TABS Laboratories Corporation Win10 MailCarrier, published on 18 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25364 exists.

Affected product: TABS Laboratories Corporation Win10 MailCarrier. 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-2019-25364/ (Markdown: https://insights.sbomify.com/CVE-2019-25364/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-25364
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-25364
- OSV: https://osv.dev/vulnerability/CVE-2019-25364

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-25364/
Summaries are generated and may contain mistakes; the official description above is the record.