Astro 6.4.7 Authorization Bypass via Decode Iteration Limit and Rewrite Path Canonicalization Mismatch

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Summary

CVECVE-2026-59731
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 17:17:25 UTC
Updated2026-07-08 17:17:25 UTC
DescriptionAstro is a web framework for content-driven websites. Version 6.4.7 performs authorization decisions on a partially decoded pathname after reaching the iterative URL decoder limit, while later rewrite route matching performs an additional decodeURI() operation and can resolve the request to a protected route. This issue is fixed in version 6.4.8.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Problem Types: CWE-647 | CWE-647 CWE-647: Use of Non-Canonical URL Paths for Authorization Decisions

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Withastro Astro affected >= 6.4.7, < 6.4.8 Not specified

References

ReferenceSourceLinkTags
github.com/withastro/astro/releases/tag/[email protected] [email protected] github.com
github.com/withastro/astro/commit/27c80ea92248993e5fce94b2c26d87d611ab6785 [email protected] github.com
github.com/withastro/astro/security/advisories/GHSA-vj59-8hwv-xxmv [email protected] github.com
github.com/withastro/astro/pull/17109 [email protected] github.com
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