CVE-2026-27829Public exploitNetwork attack vector

Server-side request forgery via unchecked inferSize URLs

Published Feb 26, 2026 · Updated Feb 26, 2026

Server-side request forgery in Astro 9.0.0 through 9.5.3 allows attackers to reach unauthorized hosts through crafted image URLs. The image pipeline's inferSize path fetches a supplied remote URL without applying the configured image.domains or image.remotePatterns allowlist. Exploitation requires inferSize and attacker influence over an image URL, enabling requests to internal services or cloud metadata endpoints.

CVSS severity6.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Astro 9.0.0 through 9.5.3 allows attackers to reach unauthorized hosts through crafted image URLs. The image pipeline's inferSize path fetches a supplied remote URL without applying the configured image.domains or image.remotePatterns allowlist. Exploitation requires inferSize and attacker influence over an image URL, enabling requests to internal services or cloud metadata endpoints.

The record

CVE
CVE-2026-27829
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
Astro Technology Company
Product
Astro
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 9.0.0, < 9.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Astro Technology Company · Astroversion=>= 9.0.0, < 9.5.4

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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