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CVE-2026-27829

Astro is vulnerable to SSRF due to missing allowlist enforcement in remote image inferSize

HIGH
7.2
CVSS Score
Published: February 26, 2026 at 12:36 AM UTC
Updated: June 17, 2026 at 10:27 AM UTC
2 products affected across 2 vendors@astrojs /nodeAstro

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Severity
HIGH7.2
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

Astro is a web framework. In versions 9.0.0 through 9.5.3, a bug in Astro's image pipeline allows bypassing `image.domains` / `image.remotePatterns` restrictions, enabling the server to fetch content from unauthorized remote hosts. Astro provides an `inferSize` option that fetches remote images at render time to determine their dimensions. Remote image fetches are intended to be restricted to domains the site developer has manually authorized (using the `image.domains` or `image.remotePatterns` options). However, when `inferSize` is used, no domain validation is performed — the image is fetched from any host regardless of the configured restrictions. An attacker who can influence the image URL (e.g., via CMS content or user-supplied data) can cause the server to fetch from arbitrary hosts. This allows bypassing `image.domains` / `image.remotePatterns` restrictions to make server-side requests to unauthorized hosts. This includes the risk of server-side request forgery (SSRF) against internal network services and cloud metadata endpoints. Version 9.5.4 fixes the issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

@astrojs /node· Astro
95%
9.0.0 ≤ v < 9.5.4
Astro· Withastro
60%
v < 9.5.4
Affected range stops below 9.5.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMExploitVendor Advisory
Source: cverecord
https://github.com/withastro/astro/security/advisories/GHSA-cj9f-h6r6-4cx2
x_refsource_MISCPatch
Source: cverecord
https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.2HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-918

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