# CVE-2026-46640: Twig: Arbitrary PHP code execution via `_self.(<string>)` macro-reference compilation

> Attackers can execute arbitrary PHP code by injecting malicious strings into Twig template macro references, affecting applications using the Twig library.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Jul 2026
- **Updated:** 16 Jul 2026
- **Also known as:** DEBIAN-CVE-2026-46640, GHSA-45vw-wh46-2vx8, UBUNTU-CVE-2026-46640

## What is CVE-2026-46640?

CVE-2026-46640 is a high-severity code injection vulnerability in twigphp Twig, published on 14 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Twig is a template language for PHP. From 3.15.0 until 3.26.0, _self.(<string>) and import-alias dynamic attribute syntax can concatenate an attacker-controlled string into a MacroReferenceExpression name without identifier validation, causing raw PHP to be emitted into the generated template source and executed at template-load time. This issue is fixed in version 3.26.0.

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

## Which versions are affected by CVE-2026-46640?

2 open source packages ship an affected version, including twig/twig. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `twig/twig` | Packagist | From 3.15.0 | 3.26.0 |
| `twig/twig` | Packagist | From 3.15.0 | 3.26.0 |

Products: Symfony Twig.

## How do I fix CVE-2026-46640?

Upgrade twig/twig to 3.26.0 or later.

## Is CVE-2026-46640 being exploited?

There is no known exploitation of CVE-2026-46640 in the wild and no public exploit code.

## Other vulnerabilities in twigphp Twig

- [CVE-2018-13818](https://insights.sbomify.com/CVE-2018-13818/): Code injection in n/a (critical 9.8)
- [CVE-2026-46633](https://insights.sbomify.com/CVE-2026-46633/): Twig: PHP code injection via `{% use %}` template name (high 8.7)
- [CVE-2026-24425](https://insights.sbomify.com/CVE-2026-24425/): Twig 2.16.x & 3.9.0-3.25.x Sandbox Bypass via SourcePolicyInterface (high 8.7)
- [CVE-2024-45411](https://insights.sbomify.com/CVE-2024-45411/): Twig has a possible sandbox bypass (high 8.6)
- [CVE-2026-46634](https://insights.sbomify.com/CVE-2026-46634/): Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name (high 7.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46640 and fix it if it is affected.

What it is: CVE-2026-46640 is a high-severity code injection vulnerability in twigphp Twig, published on 14 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-46640 in the wild and no public exploit code.

Affected packages and fixed versions:
- twig/twig (Packagist): affected from 3.15.0; fixed in 3.26.0
- twig/twig (Packagist): affected from 3.15.0; fixed in 3.26.0

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-2026-46640/ (Markdown: https://insights.sbomify.com/CVE-2026-46640/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46640
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46640
- OSV: https://osv.dev/vulnerability/CVE-2026-46640

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-46640/
Summaries are generated and may contain mistakes; the official description above is the record.