Remote resource fetch via unanchored pathname wildcard
Published Mar 24, 2026 · Updated Mar 24, 2026
Improper input validation in Astro 2.10.10 through 5.18.0 allows remote attackers to fetch disallowed paths on allowlisted hosts. The matchPathname function removes an allowed /* prefix with an unanchored replace operation, so the prefix can occur later in a crafted path. The unauthenticated image endpoint is exposed only when remotePatterns permits the chosen host and a single-segment wildcard path; bypass requests can retrieve unintended remote resources and expose their data.
Summary
What happened
Improper input validation in Astro 2.10.10 through 5.18.0 allows remote attackers to fetch disallowed paths on allowlisted hosts. The matchPathname function removes an allowed /* prefix with an unanchored replace operation, so the prefix can occur later in a crafted path. The unauthenticated image endpoint is exposed only when remotePatterns permits the chosen host and a single-segment wildcard path; bypass requests can retrieve unintended remote resources and expose their data.
The record
- CVE
- CVE-2026-33769
- Published
- Mar 24, 2026
- Updated
- Mar 24, 2026
- Vendor
- Astro Technology Company
- Product
- Astro
- Classifications
- CWE-20, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 24, 2026CVE publishedPublication date reported by the CVE source.
- Mar 24, 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.
- Affected versionversion=>= 2.10.10, < 5.18.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
- Vendor advisory image-endpoint PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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