---
title: "CVE-2025-53620: Qwik's unhandled exception vulnerabilty can cause server crashes from malicious requests"
url: https://erroneo.us/security/cve/CVE-2025-53620/
description: "CVE-2025-53620 (@builder.io/qwik-city (npm)): @builder.io/qwik-city is the meta-framework for Qwik. When a Qwik Server Action QRL is executed it dynamically…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-07-09
date_modified: 2025-07-09
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-53620"
kev: false
cvss: 9.2
epss: 0.00356
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-53620: Qwik's unhandled exception vulnerabilty can cause server crashes from malicious requests

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.4% , percentile 28: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 28% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @builder.io/qwik-city (npm) < 1.13.0, fixed in 1.13.0 . Check your lockfile, including transitive dependencies.

## What it is

@builder.io/qwik-city is the meta-framework for Qwik. When a Qwik Server Action QRL is executed it dynamically load the file containing the symbol. When an invalid qfunc is sent, the server does not handle the thrown error. The error then causes Node JS to exit. This vulnerability is fixed in 1.13.0.

## Affected packages

- npm `@builder.io/qwik-city` < 1.13.0 → fixed: 1.13.0

## Affected products (CVE record)

- QwikDev qwik: < 1.13.0

## Severity

- GitHub_M CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H`
- GitHub CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.36% probability of exploitation activity in the next 30 days; percentile 28.

## Sources

- [GitHub Advisory GHSA-qr9h-j6xg-2j72](https://github.com/advisories/GHSA-qr9h-j6xg-2j72)
- [CVE.org record CVE-2025-53620](https://www.cve.org/CVERecord?id=CVE-2025-53620)
- [NVD entry CVE-2025-53620](https://nvd.nist.gov/vuln/detail/CVE-2025-53620)
- [github.com](https://github.com/QwikDev/qwik/security/advisories/GHSA-qr9h-j6xg-2j72)
- [github.com](https://github.com/QwikDev/qwik/pull/7342)
- [github.com](https://github.com/QwikDev/qwik/releases/tag/%40builder.io%2Fqwik%401.13.0)

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Source page: https://erroneo.us/security/cve/CVE-2025-53620/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt