# CVE-2026-2259: aardappel lobster Parsing parser.h ParseStatements memory corruption

> Local attackers can exploit memory corruption in the Lobster parser to potentially execute arbitrary code or cause denial of service.

- **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-xfpq-772f-h5qw

## What is CVE-2026-2259?

CVE-2026-2259 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 vulnerability has been found in aardappel lobster up to 2025.4. Affected by this issue is the function lobster::Parser::ParseStatements in the library dev/src/lobster/parser.h of the component Parsing. The manipulation leads to memory corruption. The attack can only be performed from a local environment. The exploit has been disclosed to the public and may be used. The identifier of the patch is 2f45fe860d00990e79e13250251c1dde633f1f89. Applying a patch is the recommended action to fix 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-2026-2259?

It affects 1 product.


Products: Strlen Lobster.

## How do I fix CVE-2026-2259?

No fix has been published for CVE-2026-2259 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2259 being exploited?

There is no known exploitation of CVE-2026-2259 in the wild and no public exploit code.

## 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-2026-2258](https://insights.sbomify.com/CVE-2026-2258/): aardappel lobster wfc.h WaveFunctionCollapse memory corruption (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2259 and fix it if it is affected.

What it is: CVE-2026-2259 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: There is no known exploitation of CVE-2026-2259 in the wild and no public exploit code.

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-2026-2259/ (Markdown: https://insights.sbomify.com/CVE-2026-2259/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2259
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2259
- OSV: https://osv.dev/vulnerability/CVE-2026-2259

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2259/
Summaries are generated and may contain mistakes; the official description above is the record.