# CVE-2026-41507: Remote Code Execution (RCE) via String Literal Injection into math-codegen

> Attackers can execute arbitrary system commands by injecting code into math expressions processed by the math-codegen library.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 8 May 2026
- **Updated:** 8 May 2026
- **Also known as:** GHSA-p6x5-p4xf-cc4r

## What is CVE-2026-41507?

CVE-2026-41507 is a critical code injection vulnerability in mauriciopoppe math-codegen, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

math-codegen generates code from mathematical expressions. Prior to version 0.4.3, string literal content passed to cg.parse() is injected verbatim into a new Function() body without sanitization. This allows an attacker to execute arbitrary system commands when user-controlled input reaches the parser. Any application exposing a math evaluation endpoint where user input flows into cg.parse() is vulnerable to full RCE. This issue has been patched in version 0.4.3.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-41507?

2 open source packages ship an affected version, including math-codegen. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `math-codegen` | npm | All versions | 0.4.3 |
| `math-codegen` | npm | All versions | 0.4.3 |

Products: Mauriciopoppe Math-Codegen.

## How do I fix CVE-2026-41507?

Upgrade math-codegen to 0.4.3 or later.

## Is CVE-2026-41507 being exploited?

There is no known exploitation of CVE-2026-41507 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41507 and fix it if it is affected.

What it is: CVE-2026-41507 is a critical code injection vulnerability in mauriciopoppe math-codegen, published on 8 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-2026-41507 in the wild and no public exploit code.

Affected packages and fixed versions:
- math-codegen (npm): affected all versions; fixed in 0.4.3
- math-codegen (npm): affected all versions; fixed in 0.4.3

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-2026-41507/ (Markdown: https://insights.sbomify.com/CVE-2026-41507/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41507
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41507
- OSV: https://osv.dev/vulnerability/CVE-2026-41507

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-41507/
Summaries are generated and may contain mistakes; the official description above is the record.