How severe is CVE-2025-62595?

CVE-2025-62595 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-62595 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-62595?

CVE-2025-62595 primarily affects Koajs Koa. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-62595?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-62595 have an EU (EUVD) identifier?

Yes. CVE-2025-62595 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35182.

When was CVE-2025-62595 published?

CVE-2025-62595 was published on 2025-10-21 and last updated on 2026-06-17.

CVE-2025-62595

CVE-2025-62595 is a medium-severity vulnerability in Koajs Koa with a CVSS 3.x base score of 4.3. 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-601.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-35182
Weakness: CWE-601
Affected product: Koajs Koa
Published: 2025-10-21
Last modified: 2026-06-17

Description

Koa is expressive middleware for Node.js using ES2017 async functions. In versions 2.16.2 to before 2.16.3 and 3.0.1 to before 3.0.3, a bypass to CVE-2025-8129 was discovered in the Koa.js framework affecting its back redirect functionality. In certain circumstances, an attacker can manipulate the Referer header to force a user’s browser to navigate to an external, potentially malicious website. This occurs because the implementation incorrectly treats some specially crafted URLs as safe relative paths. Exploiting this vulnerability could allow attackers to perform phishing, social engineering, or other redirect-based attacks on users of affected applications. This issue has been patched in version 3.0.3.

Frequently asked questions

What is CVE-2025-62595?: Koa is expressive middleware for Node.js using ES2017 async functions. In versions 2.16.2 to before 2.16.3 and 3.0.1 to before 3.0.3, a bypass to CVE-2025-8129 was discovered in the Koa.js framework affecting its back redirect functionality. In certain circumstances, an attacker can manipulate the Referer header to force a user’s browser to navigate to an external, potentially malicious website. This occurs because the implementation incorrectly treats some specially crafted URLs as safe relative paths. Exploiting this vulnerability could allow attackers to perform phishing, social engineering, or other redirect-based attacks on users of affected applications. This issue has been patched in version 3.0.3.
How severe is CVE-2025-62595?: CVE-2025-62595 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-62595 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-62595?: CVE-2025-62595 primarily affects Koajs Koa. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-62595?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-62595 have an EU (EUVD) identifier?: Yes. CVE-2025-62595 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35182.
When was CVE-2025-62595 published?: CVE-2025-62595 was published on 2025-10-21 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:2.16.2:*:*:*:*:node.js:*:*

More vulnerabilities in Koajs Koa

CVE-2026-27959 — High (CVSS 7.5): Koa is middleware for Node.js using ES2017 async functions. Prior to versions 3.1.2 and 2.16.4, Koa's `ctx.hostname`…
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CVE-2025-32379 — Medium (CVSS 5.0): Koa is expressive middleware for Node.js using ES2017 async functions. In koa < 2.16.1 and < 3.0.0-alpha.5, passing…
CVE-2025-8129 — Low (CVSS 3.5): A vulnerability, which was classified as problematic, was found in KoaJS Koa up to 3.0.0. Affected is the function back…

All CVEs affecting Koajs Koa →

Other CWE-601 (Open Redirect) vulnerabilities

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CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.

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