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Vulnerabilities

Vulnerability · CVE-2026-25545

Astro is a web framework.

Published Feb 24, 2026 · catalog updated Jun 17, 2026 · Astro is a web

Check if you run it

No confirmed exploitation is on record for CVE-2026-25545. EPSS is 1.98%. Act only if a listed version of Astro is a web is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Astro is a web).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.98%
Remediation
Advisory link
Affected products
cpe astro/@astrojs/node

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. or ) are vulnerable to SSRF. If the header is changed to an attacker's server, it will be fetched on 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 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe astro/@astrojs/nodeversion unspecified

How to fix CVE-2026-25545

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-25545. EPSS is 1.98%. Act only if a listed version of Astro is a web is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-918: Server-Side Request Forgery (SSRF). EPSS 1.98%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 24, 2026 · NIST NVD

    Detected

    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. or ) are vulnerable to SSRF. If the header is changed to an attacker's server, it will be fetched on 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 header v

  2. Jun 17, 2026 · NIST NVD

    Updated

    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. or ) are vulnerable to SSRF. If the header is changed to an attacker's server, it will be fetched on 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 header v

Sources

  • CVE.orgVulnerability recordCVE-2026-25545

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-25545

    30-day exploitation probability 2.0%

    first.org
  • NIST NVDVulnerability recordCVE-2026-25545

    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. or ) are vulnerable to SSRF. If the header is changed to an attacker's server, it will be fetched on `/500.ht

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.