# CVE-2026-57228: Suricata smtp/mime: heap out-of-bounds read quoted-printable decoder

> Crafted SMTP traffic can cause a heap out-of-bounds read and crash Suricata when MIME decoding is enabled.

- **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Sep 2026
- **Updated:** 21 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-57228, GHSA-qxm4-q7vx-7xj4, UBUNTU-CVE-2026-57228

## What is CVE-2026-57228?

CVE-2026-57228 is a high-severity memory corruption vulnerability in Oisf Suricata, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 7.0.13 until 7.0.17, the SMTP MIME quoted-printable decoder in src/util-decode-mime.c can read one byte past a heap buffer when a quoted-printable escape sequence is split across traffic chunks and the following chunk contains exactly one byte. Crafted SMTP traffic can trigger the out-of-bounds read and crash Suricata when decode-quoted-printable MIME decoding is enabled. This issue is fixed in version 7.0.17.

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

## Which versions are affected by CVE-2026-57228?

It affects 1 product.


Products: Oisf Suricata.

## How do I fix CVE-2026-57228?

Upgrade to a fixed version.

## Is CVE-2026-57228 being exploited?

There is no known exploitation of CVE-2026-57228 in the wild and no public exploit code.

## Other vulnerabilities in Oisf Suricata

- [CVE-2023-35853](https://insights.sbomify.com/CVE-2023-35853/): Code injection in n/a (critical 9.8)
- [CVE-2021-37592](https://insights.sbomify.com/CVE-2021-37592/): Other in n/a (critical 9.8)
- [CVE-2018-10244](https://insights.sbomify.com/CVE-2018-10244/): Integer overflow in n/a (critical 9.8)
- [CVE-2026-94083](https://insights.sbomify.com/CVE-2026-94083/): Memory corruption in Suricata (critical 9.4)
- [CVE-2026-94084](https://insights.sbomify.com/CVE-2026-94084/): Use after free in Suricata (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57228 and fix it if it is affected.

What it is: CVE-2026-57228 is a high-severity memory corruption vulnerability in Oisf Suricata, published on 18 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-2026-57228 in the wild and no public exploit code.

Affected product: Oisf Suricata. 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-2026-57228/ (Markdown: https://insights.sbomify.com/CVE-2026-57228/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57228
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57228
- OSV: https://osv.dev/vulnerability/CVE-2026-57228

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57228/
Summaries are generated and may contain mistakes; the official description above is the record.