CVE-2026-33769
published 2026-03-24CVE-2026-33769: Astro is a web framework. From version 2.10.10 to before version 5.18.1, this issue concerns Astro's remotePatterns path enforcement for remote URLs used by…
PriorityP432medium5.3CVSS 3.1
AVNACLPRNUINSUCLINAN
EPSS
0.33%
24.2th percentile
Astro is a web framework. From version 2.10.10 to before version 5.18.1, this issue concerns Astro's remotePatterns path enforcement for remote URLs used by server-side fetchers such as the image optimization endpoint. The path matching logic for /* wildcards is unanchored, so a pathname that contains the allowed prefix later in the path can still match. As a result, an attacker can fetch paths outside the intended allowlisted prefix on an otherwise allowed host. This issue has been patched in version 5.18.1.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| astro | astro | >= 2.10.10 < 5.18.1 | 5.18.1 |
| astro | astro | >= 2.10.10 < 5.18.1 | 5.18.1 |
| withastro | astro | — | — |
CVSS provenance
nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
nvdv4.02.9LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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OSV
Astro: Remote allowlist bypass via unanchored matchPathname wildcard
osv·2026-03-26
CVE-2026-33769 [LOW] Astro: Remote allowlist bypass via unanchored matchPathname wildcard
Astro: Remote allowlist bypass via unanchored matchPathname wildcard
## Summary
This issue concerns Astro's `remotePatterns` path enforcement for remote URLs used by server-side fetchers such as the image optimization endpoint. The path matching logic for `/*` wildcards is unanchored, so a pathname that contains the allowed prefix later in the path can still match. As a result, an attacker can fetch paths outside the intended allowlisted prefix on an otherwise allowed host. In our PoC, both the allowed path and a bypass path returned 200 with the same SVG payload, confirming the bypass.
## Impact
Attackers can fetch unintended remote resources on an allowlisted host via the image endpoint, expanding SSRF/data exposure beyond the configured path prefix.
## Description
Taint flow: request
GHSA
Astro: Remote allowlist bypass via unanchored matchPathname wildcard
ghsa·2026-03-26
CVE-2026-33769 [LOW] CWE-183 Astro: Remote allowlist bypass via unanchored matchPathname wildcard
Astro: Remote allowlist bypass via unanchored matchPathname wildcard
## Summary
This issue concerns Astro's `remotePatterns` path enforcement for remote URLs used by server-side fetchers such as the image optimization endpoint. The path matching logic for `/*` wildcards is unanchored, so a pathname that contains the allowed prefix later in the path can still match. As a result, an attacker can fetch paths outside the intended allowlisted prefix on an otherwise allowed host. In our PoC, both the allowed path and a bypass path returned 200 with the same SVG payload, confirming the bypass.
## Impact
Attackers can fetch unintended remote resources on an allowlisted host via the image endpoint, expanding SSRF/data exposure beyond the configured path prefix.
## Description
Taint flow: request
No detection rules found.
No public exploits indexed.
2026-03-24
Published