# CVE-2026-45761: Suricata detect: case-insensitive frame handling can cause heap buffer overflow during rule load

> A heap buffer overflow in Suricata's rule parser allows attackers to execute code or cause denial of service by loading crafted rules with mixed-case frame syntax.

- **Severity:** Low 3.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-45761, GHSA-r74x-74x5-r9vm, UBUNTU-CVE-2026-45761

## What is CVE-2026-45761?

CVE-2026-45761 is a low-severity memory corruption vulnerability in Oisf Suricata, published on 10 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, a crafted rule using mixed-case frame syntax could trigger a heap buffer overflow while Suricata is loading signatures. The issue is reached during rule parsing/loading rather than by network traffic alone. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, preprocess rules to check that frames are all lowercase and/or only load trusted rulesets.

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

## Which versions are affected by CVE-2026-45761?

It affects 1 product.


Products: Oisf Suricata.

## How do I fix CVE-2026-45761?

Upgrade to a fixed version.

## Is CVE-2026-45761 being exploited?

There is no known exploitation of CVE-2026-45761 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-2026-45761 and fix it if it is affected.

What it is: CVE-2026-45761 is a low-severity memory corruption vulnerability in Oisf Suricata, published on 10 Sep 2026. 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-2026-45761 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-2026-45761/ (Markdown: https://insights.sbomify.com/CVE-2026-45761/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45761
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45761
- OSV: https://osv.dev/vulnerability/CVE-2026-45761

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45761/
Summaries are generated and may contain mistakes; the official description above is the record.