# CVE-2026-45756: Symfony: JsonPath Evaluates Attacker-Controlled Regular Expressions in match()/search() Without Limits — ReDoS

> Attackers can cause denial of service in Symfony JsonPath by submitting malicious regular expressions that trigger catastrophic backtracking.

- **Severity:** High 8.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Jul 2026
- **Updated:** 21 Jul 2026
- **Also known as:** DEBIAN-CVE-2026-45756, GHSA-8v8v-g73j-492j, UBUNTU-CVE-2026-45756

## What is CVE-2026-45756?

CVE-2026-45756 is a high-severity denial of service vulnerability in Sensiolabs Symfony, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 7.3.0-BETA1 until 7.4.12 and 8.0.12, the JsonPath component compiles attacker-controlled match() and search() filter patterns directly into preg_match() without a length cap, i-regexp restriction, or bounded backtracking, allowing catastrophic-backtracking expressions to pin worker CPU and cause denial of service. This issue is fixed in versions 7.4.12 and 8.0.12.

Weakness: CWE-400 (Uncontrolled Resource Consumption), CWE-1333 (Inefficient Regular Expression Complexity)

## Which versions are affected by CVE-2026-45756?

8 open source packages ship an affected version, including symfony/json-path and symfony/symfony. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `symfony/json-path` | Packagist | From 7.3.0 | 7.4.12 |
| `symfony/json-path` | Packagist | From 7.3.0 | 7.4.12 |
| `symfony/json-path` | Packagist | From 8.0.0 | 8.0.12 |
| `symfony/json-path` | Packagist | From 8.0.0 | 8.0.12 |
| `symfony/symfony` | Packagist | From 7.3.0 | 7.4.12 |
| `symfony/symfony` | Packagist | From 7.3.0 | 7.4.12 |
| `symfony/symfony` | Packagist | From 8.0.0 | 8.0.12 |
| `symfony/symfony` | Packagist | From 8.0.0 | 8.0.12 |

Products: Sensiolabs Symfony.

## How do I fix CVE-2026-45756?

Upgrade symfony/json-path to a fixed version for your release line: 7.4.12 or 8.0.12.

## Is CVE-2026-45756 being exploited?

There is no known exploitation of CVE-2026-45756 in the wild and no public exploit code.

## Other vulnerabilities in Sensiolabs Symfony

- [CVE-2019-11325](https://insights.sbomify.com/CVE-2019-11325/): Improper Input Validation in Symfony (critical 9.8)
- [CVE-2017-11365](https://insights.sbomify.com/CVE-2017-11365/): Symfony Incorrect Access Control (critical 9.8)
- [CVE-2019-10913](https://insights.sbomify.com/CVE-2019-10913/): Invalid HTTP method overrides allow possible XSS or other attacks in Symfony (critical 9.8)
- [CVE-2018-11407](https://insights.sbomify.com/CVE-2018-11407/): Symfony Authentication Bypass (critical 9.8)
- [CVE-2016-2403](https://insights.sbomify.com/CVE-2016-2403/): Symfony Authentication Bypass (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45756 and fix it if it is affected.

What it is: CVE-2026-45756 is a high-severity denial of service vulnerability in Sensiolabs Symfony, published on 14 Jul 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-2026-45756 in the wild and no public exploit code.

Affected packages and fixed versions:
- symfony/json-path (Packagist): affected from 7.3.0; fixed in 7.4.12
- symfony/json-path (Packagist): affected from 7.3.0; fixed in 7.4.12
- symfony/json-path (Packagist): affected from 8.0.0; fixed in 8.0.12
- symfony/json-path (Packagist): affected from 8.0.0; fixed in 8.0.12
- symfony/symfony (Packagist): affected from 7.3.0; fixed in 7.4.12
- symfony/symfony (Packagist): affected from 7.3.0; fixed in 7.4.12
- symfony/symfony (Packagist): affected from 8.0.0; fixed in 8.0.12
- symfony/symfony (Packagist): affected from 8.0.0; fixed in 8.0.12

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-2026-45756/ (Markdown: https://insights.sbomify.com/CVE-2026-45756/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45756
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45756
- OSV: https://osv.dev/vulnerability/CVE-2026-45756

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45756/
Summaries are generated and may contain mistakes; the official description above is the record.