Remote image allowlist bypass via unescaped path regex
Published Aug 12, 2026 · Updated Aug 12, 2026
Allowlist bypass in Astro's Netlify adapter before 8.1.2 allows remote attackers to optimize excluded images on an allowed host. The remotePatternToRegex() function inserts literal pathname values into Netlify allowlist regexes without escaping regular expression metacharacters. Exploitation requires a configured pathname containing such characters and a target image at an adjacent excluded path on the same allowed host.
Summary
What happened
Allowlist bypass in Astro's Netlify adapter before 8.1.2 allows remote attackers to optimize excluded images on an allowed host. The remotePatternToRegex() function inserts literal pathname values into Netlify allowlist regexes without escaping regular expression metacharacters. Exploitation requires a configured pathname containing such characters and a target image at an adjacent excluded path on the same allowed host.
The record
- CVE
- CVE-2026-73425
- Published
- Aug 12, 2026
- Updated
- Aug 12, 2026
- Vendor
- Astro Technology Company
- Product
- Astro
- Classifications
- T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 12, 2026CVE publishedPublication date reported by the CVE source.
- Aug 12, 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=< 8.1.2
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
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Weakness, pattern, technique
Public exploit references
- Upstream generated-regex proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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