Bypass in Astro Web Framework Image Pipeline Affects Multiple Versions
CVE-2026-27829

6.5MEDIUM

Key Information:

Vendor

Withastro

Status
Astro
Vendor
CVE Published:
26 February 2026

What is CVE-2026-27829?

In the Astro web framework, versions 9.0.0 through 9.5.3 contain a vulnerability in the image pipeline that allows attackers to bypass configured domain restrictions. This occurs when the 'inferSize' option is utilized, permitting image fetching from unauthorized remote hosts, regardless of developer permissions set through 'image.domains' or 'image.remotePatterns'. Consequently, an attacker capable of influencing image URLs can exploit this flaw, leading to potential server-side request forgery (SSRF) attacks against internal services and cloud metadata endpoints. The issue has been rectified in Astro version 9.5.4.

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Affected Version(s)

astro >= 9.0.0, < 9.5.4

References

https://github.com/withastro/astro/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/withastro/astro/commit/e01e98b063e90d2...
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CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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