# CVE-2026-2258: aardappel lobster wfc.h WaveFunctionCollapse memory corruption

> Local attackers can trigger memory corruption in the WaveFunctionCollapse function of the Lobster library, potentially leading to code execution or crashes.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **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:** No
- **Published:** 10 Feb 2026
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-8837-98gj-mqw6

## What is CVE-2026-2258?

CVE-2026-2258 is a medium-severity memory corruption vulnerability in aardappel lobster, published on 10 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw has been found in aardappel lobster up to 2025.4. Affected by this vulnerability is the function WaveFunctionCollapse in the library dev/src/lobster/wfc.h. Executing a manipulation can lead to memory corruption. The attack can only be executed locally. The exploit has been published and may be used. This patch is called c2047a33e1ac2c42ab7e8704b33f7ea518a11ffd. It is advisable to implement a patch to correct this issue.

Weakness: CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-2258?

It affects 1 product.


Products: Strlen Lobster.

## How do I fix CVE-2026-2258?

No fix has been published for CVE-2026-2258 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2258 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2258 exists.

## Other vulnerabilities in aardappel lobster

- [CVE-2026-2887](https://insights.sbomify.com/CVE-2026-2887/): aardappel lobster idents.h TypeName recursion (medium 4.8)
- [CVE-2026-2259](https://insights.sbomify.com/CVE-2026-2259/): aardappel lobster Parsing parser.h ParseStatements memory corruption (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2258 and fix it if it is affected.

What it is: CVE-2026-2258 is a medium-severity memory corruption vulnerability in aardappel lobster, published on 10 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2258 exists.

Affected product: aardappel lobster. 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-2026-2258/ (Markdown: https://insights.sbomify.com/CVE-2026-2258/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2258
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2258
- OSV: https://osv.dev/vulnerability/CVE-2026-2258

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2258/
Summaries are generated and may contain mistakes; the official description above is the record.