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CVE-2025-55303

Unauthorized third-party images in Astro’s _image endpoint

Published: Aug 19, 2025Updated: Nov 25, 2025 Sources: CVE List NVD GHSACWE-79
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.6%
Top 56.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
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Description

Astro is a web framework for content-driven websites. In versions of astro before 5.13.2 and 4.16.18, the image optimization endpoint in projects deployed with on-demand rendering allows images from unauthorized third-party domains to be served. On-demand rendered sites built with Astro include an /_image endpoint which returns optimized versions of images. A bug in impacted versions of astro allows an attacker to bypass the third-party domain restrictions by using a protocol-relative URL as the image source, e.g. /_image?href=//example.com/image.png. This vulnerability is fixed in 5.13.2 and 4.16.18.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79CWE-115

Affected Products

astroastro
Mixed
OSS Libraries / web-framework
astrowithastro
Library
OSS Libraries / web-framework
astronpmOSS Libraries
@astrojs/nodenpmOSS Libraries
astrooss-projectUSOSS Librariesaka @astrojs/node, @astrojs/cloudflare
withastrooss-projectOSS Librariesaka astro, @astrojs/cloudflare
npmpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
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References

https://github.com/withastro/astro/commit/4d16de7f95db5d1ec1ce88610d2a95e606e83820
github.com
https://github.com/withastro/astro/security/advisories/GHSA-xf8x-j4p2-f749
github.com
https://nvd.nist.gov/vuln/detail/CVE-2025-55303
nvd.nist.gov
and 1 more references View all →

Timeline

Published
Aug 19, 2025
Last Updated
Nov 25, 2025

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