Allocation of Resources Without Limits or Throttling Affecting astro package, versions >=5.0.0 <5.17.3>=6.0.0-alpha.0 <6.0.0-beta.15
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Feb 2026
- disclosed24 Feb 2026
- creditKomiya
Introduced: 24 Feb 2026
NewCVE-2026-27729 (opens in a new tab)How to fix?
Upgrade astro to version 5.17.3, 6.0.0-beta.15 or higher.
Overview
astro is an Astro is a modern site builder with web best practices, performance, and DX front-of-mind.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in parseRequestBody(), when parsing Server Action requests. Attackers can trigger a crash by sending an excessively large POST request to an action endpoint, on a site with on-demand rendering. In the Node adapter (mode: 'standalone') an HTTP server with no body size protection is used, so the crashed process is automatically restarted, and repeated requests cause a persistent crash-restart loop.
Note: Action names are discoverable from HTML form attributes on any public page.
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm
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