Vulnerability · Published Nov 19, 2025 · Assigned by GitHub_M

CVE-2025-64765Astro middleware authentication checks based on url.pathname can be bypassed via url encoded values

Medium 6.9

In plain English

A medium-severity path traversal in astro from withastro. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.5%top 54.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Astro is a web framework. Prior to version 5.15.8, a mismatch exists between how Astro normalizes request paths for routing/rendering and how the application’s middleware reads the path for validation checks. Astro internally applies decodeURI() to determine which route to render, while the middleware uses context.url.pathname without applying the same normalization (decodeURI). This discrepancy may allow attackers to reach protected routes using encoded path variants that pass routing but bypass validation checks. This issue has been patched in version 5.15.8.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	astro	5.15.8	GHSA-ggxq-hp9w-j794

Affected products (as reported)

Vendor	Product	Versions
withastro	astro	< 5.15.8

Weakness: CWE-22 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794 x_refsource_CONFIRM
https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce x_refsource_MISC