# CVE-2026-43988: Vanetza: Remote Denial of Service via Uncaught Exception in ASN.1/OER Parsing

> Remote attackers can crash the Vanetza application by sending malformed ASN.1/OER packets that trigger an uncaught exception.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:** No
- **Published:** 26 May 2026
- **Updated:** 27 May 2026
- **Also known as:** GHSA-j6cj-rp87-mfrx

## What is CVE-2026-43988?

CVE-2026-43988 is a high-severity denial of service vulnerability in riebl vanetza, published on 26 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vanetza is an open-source implementation of the ETSI C-ITS protocol suite. In 26.02 and earlier, a denial-of-service vulnerability was identified in the ASN.1/OER parsing pipeline of Vanetza. When processing malformed network packets containing corrupted ASN.1/OER structures (e.g., invalid length fields or malformed certificate encoding), the ASN.1 wrapper (asn1c_wrapper.cpp) raises a std::runtime_error. This exception is not caught at the parsing boundary and propagates to std::terminate, resulting in process termination. This vulnerability is fixed with commit 62dfe58a8342512b6e1947d75821402ada524f1a.

Weakness: CWE-248 (Uncaught Exception)

## Which versions are affected by CVE-2026-43988?


## How do I fix CVE-2026-43988?

No fix has been published for CVE-2026-43988 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-43988 being exploited?

There is no known exploitation of CVE-2026-43988 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-43988 and fix it if it is affected.

What it is: CVE-2026-43988 is a high-severity denial of service vulnerability in riebl vanetza, published on 26 May 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-2026-43988 in the wild and no public exploit code.

Affected product: riebl vanetza. 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-2026-43988/ (Markdown: https://insights.sbomify.com/CVE-2026-43988/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-43988
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-43988
- OSV: https://osv.dev/vulnerability/CVE-2026-43988

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-43988/
Summaries are generated and may contain mistakes; the official description above is the record.