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CVE-2026-25545

Astro @astrojs/node server-side request forgery (SSRF)

8.6 HIGHPublic exploitEPSS 1.94%
  1. Published24 Feb 2026

Description

Astro is a web framework. Prior to version 9.5.4, Server-Side Rendered pages that return an error with a prerendered custom error page (eg. `404.astro` or `500.astro`) are vulnerable to SSRF. If the `Host:` header is changed to an attacker's server, it will be fetched on `/500.html` and they can redirect this to any internal URL to read the response body through the first request. An attacker who can access the application without `Host:` header validation (eg. through finding the origin IP behind a proxy, or just by default) can fetch their own server to redirect to any internal IP. With this they can fetch cloud metadata IPs and interact with services in the internal network or localhost. For this to be vulnerable, a common feature needs to be used, with direct access to the server (no proxies). Version 9.5.4 fixes the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

Astro @astrojs/node< 9.5.4

Remediation

Fixed in
Astro @astrojs/node≥ 9.5.4

References

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Frequently asked

Is CVE-2026-25545 being actively exploited?

CVE-2026-25545 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.94%.

How severe is CVE-2026-25545?

CVE-2026-25545 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 1.94% probability of exploitation.

Which products are affected by CVE-2026-25545?

Affected products include Astro @astrojs/node.

How do I fix CVE-2026-25545?

Upgrade affected software to a fixed version, for example Astro @astrojs/node 9.5.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-25545 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.