CVE-2026-59731 (CVSS 8.2)

Description

Astro 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.

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CVSS v3.1 Score

8.2

HIGH

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

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-647 CWE-647

References

Other References

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

Frequently Asked Questions

What is CVE-2026-59731? +

Astro 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. It has a CVSS v3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-59731? +

CVE-2026-59731 has a CVSS v3.1 score of 8.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-59731? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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