How severe is CVE-2025-59837?

CVE-2025-59837 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-59837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59837?

CVE-2025-59837 affects Astro. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59837?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-59837 have an EU (EUVD) identifier?

Yes. CVE-2025-59837 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36542.

When was CVE-2025-59837 published?

CVE-2025-59837 was published on 2025-10-28 and last updated on 2026-06-17.

CVE-2025-59837

CVE-2025-59837 is a high-severity vulnerability in Astro with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-36542
Weakness: CWE-79
Affected product: Astro
Published: 2025-10-28
Last modified: 2026-06-17

Description

Astro is a web framework that includes an image proxy. In versions 5.13.4 and later before 5.13.10, the image proxy domain validation can be bypassed by using backslashes in the href parameter, allowing server-side requests to arbitrary URLs. This can lead to server-side request forgery (SSRF) and potentially cross-site scripting (XSS). This vulnerability exists due to an incomplete fix for CVE-2025-58179. Fixed in 5.13.10.

Frequently asked questions

What is CVE-2025-59837?: Astro is a web framework that includes an image proxy. In versions 5.13.4 and later before 5.13.10, the image proxy domain validation can be bypassed by using backslashes in the href parameter, allowing server-side requests to arbitrary URLs. This can lead to server-side request forgery (SSRF) and potentially cross-site scripting (XSS). This vulnerability exists due to an incomplete fix for CVE-2025-58179. Fixed in 5.13.10.
How severe is CVE-2025-59837?: CVE-2025-59837 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-59837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59837?: CVE-2025-59837 affects Astro. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59837?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-59837 have an EU (EUVD) identifier?: Yes. CVE-2025-59837 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36542.
When was CVE-2025-59837 published?: CVE-2025-59837 was published on 2025-10-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:*

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