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12 vulnerabilities by KoaJS
CVE-2026-27959 (GCVE-0-2026-27959)
Vulnerability from nvd – Published: 2026-02-26 01:45 – Updated: 2026-02-26 19:32
VLAI
Title
Koa has Host Header Injection via `ctx.hostname`
Summary
Koa is middleware for Node.js using ES2017 async functions. Prior to versions 3.1.2 and 2.16.4, Koa's `ctx.hostname` API performs naive parsing of the HTTP Host header, extracting everything before the first colon without validating the input conforms to RFC 3986 hostname syntax. When a malformed Host header containing a `@` symbol is received, `ctx.hostname` returns `evil[.]com` - an attacker-controlled value. Applications using `ctx.hostname` for URL generation, password reset links, email verification URLs, or routing decisions are vulnerable to Host header injection attacks. Versions 3.1.2 and 2.16.4 fix the issue.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/koajs/koa/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/koajs/koa/commit/55ab9bab044ea… | x_refsource_MISC |
| https://github.com/koajs/koa/commit/b76ddc01fdb70… | x_refsource_MISC |
Impacted products
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CVE-2025-62595 (GCVE-0-2025-62595)
Vulnerability from nvd – Published: 2025-10-21 16:20 – Updated: 2025-10-21 16:35
VLAI
Title
Koa Vulnerable to Open Redirect via Trailing Double-Slash (//) in back Redirect Logic
Summary
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.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/koajs/koa/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/koajs/koa/commit/769fd75cc6b30… | x_refsource_MISC |
Impacted products
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CVE-2025-8129 (GCVE-0-2025-8129)
Vulnerability from nvd – Published: 2025-07-25 04:02 – Updated: 2025-07-25 12:01
VLAI
Title
KoaJS Koa HTTP Header response.js back redirect
Summary
A vulnerability, which was classified as problematic, was found in KoaJS Koa up to 3.0.0. Affected is the function back in the library lib/response.js of the component HTTP Header Handler. The manipulation of the argument Referrer leads to open redirect. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-601 - Open Redirect
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.317514 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.317514 | signaturepermissions-required |
| https://vuldb.com/?submit.619741 | third-party-advisory |
| https://github.com/koajs/koa/issues/1892 | issue-tracking |
| https://github.com/koajs/koa/issues/1892#issue-32… | exploitissue-tracking |
Credits
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CVE-2025-32379 (GCVE-0-2025-32379)
Vulnerability from nvd – Published: 2025-04-09 15:56 – Updated: 2025-04-09 20:45
VLAI
Title
XSS at ctx.redirect() function in Koajs
Summary
Koa is expressive middleware for Node.js using ES2017 async functions. In koa < 2.16.1 and < 3.0.0-alpha.5, passing untrusted user input to ctx.redirect() even after sanitizing it, may execute javascript code on the user who use the app. This issue is patched in 2.16.1 and 3.0.0-alpha.5.
Severity
5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/koajs/koa/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/koajs/koa/commit/ff25eb4a7f239… | x_refsource_MISC |
Impacted products
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}
CVE-2025-25200 (GCVE-0-2025-25200)
Vulnerability from nvd – Published: 2025-02-12 17:59 – Updated: 2025-02-12 19:29
VLAI
Title
Koa has Inefficient Regular Expression Complexity
Summary
Koa is expressive middleware for Node.js using ES2017 async functions. Prior to versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3, Koa uses an evil regex to parse the `X-Forwarded-Proto` and `X-Forwarded-Host` HTTP headers. This can be exploited to carry out a Denial-of-Service attack. Versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3 fix the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/koajs/koa/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/koajs/koa/commit/5054af6e31ffd… | x_refsource_MISC |
| https://github.com/koajs/koa/commit/5f294bb1c7c8d… | x_refsource_MISC |
| https://github.com/koajs/koa/commit/93fe903fc9666… | x_refsource_MISC |
| https://github.com/koajs/koa/blob/master/lib/requ… | x_refsource_MISC |
| https://github.com/koajs/koa/blob/master/lib/requ… | x_refsource_MISC |
| https://github.com/koajs/koa/releases/tag/2.15.4 | x_refsource_MISC |
Impacted products
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CVE-2023-49803 (GCVE-0-2023-49803)
Vulnerability from nvd – Published: 2023-12-11 22:42 – Updated: 2024-08-02 22:01
VLAI
Title
@koa/cors has overly permissive origin policy
Summary
@koa/cors npm provides Cross-Origin Resource Sharing (CORS) for koa, a web framework for Node.js. Prior to version 5.0.0, the middleware operates in a way that if an allowed origin is not provided, it will return an `Access-Control-Allow-Origin` header with the value of the origin from the request. This behavior completely disables one of the most crucial elements of browsers - the Same Origin Policy (SOP), this could cause a very serious security threat to the users of this middleware. If such behavior is expected, for instance, when middleware is used exclusively for prototypes and not for production applications, it should be heavily emphasized in the documentation along with an indication of the risks associated with such behavior, as many users may not be aware of it. Version 5.0.0 fixes this vulnerability.
Severity
8.6 (High)
CWE
- CWE-346 - Origin Validation Error
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/koajs/cors/security/advisories… | x_refsource_CONFIRM |
| https://github.com/koajs/cors/commit/f31dac99f535… | x_refsource_MISC |
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CVE-2026-27959 (GCVE-0-2026-27959)
Vulnerability from cvelistv5 – Published: 2026-02-26 01:45 – Updated: 2026-02-26 19:32
VLAI
Title
Koa has Host Header Injection via `ctx.hostname`
Summary
Koa is middleware for Node.js using ES2017 async functions. Prior to versions 3.1.2 and 2.16.4, Koa's `ctx.hostname` API performs naive parsing of the HTTP Host header, extracting everything before the first colon without validating the input conforms to RFC 3986 hostname syntax. When a malformed Host header containing a `@` symbol is received, `ctx.hostname` returns `evil[.]com` - an attacker-controlled value. Applications using `ctx.hostname` for URL generation, password reset links, email verification URLs, or routing decisions are vulnerable to Host header injection attacks. Versions 3.1.2 and 2.16.4 fix the issue.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/koajs/koa/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/koajs/koa/commit/55ab9bab044ea… | x_refsource_MISC |
| https://github.com/koajs/koa/commit/b76ddc01fdb70… | x_refsource_MISC |
Impacted products
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CVE-2025-62595 (GCVE-0-2025-62595)
Vulnerability from cvelistv5 – Published: 2025-10-21 16:20 – Updated: 2025-10-21 16:35
VLAI
Title
Koa Vulnerable to Open Redirect via Trailing Double-Slash (//) in back Redirect Logic
Summary
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.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/koajs/koa/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/koajs/koa/commit/769fd75cc6b30… | x_refsource_MISC |
Impacted products
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CVE-2025-8129 (GCVE-0-2025-8129)
Vulnerability from cvelistv5 – Published: 2025-07-25 04:02 – Updated: 2025-07-25 12:01
VLAI
Title
KoaJS Koa HTTP Header response.js back redirect
Summary
A vulnerability, which was classified as problematic, was found in KoaJS Koa up to 3.0.0. Affected is the function back in the library lib/response.js of the component HTTP Header Handler. The manipulation of the argument Referrer leads to open redirect. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-601 - Open Redirect
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.317514 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.317514 | signaturepermissions-required |
| https://vuldb.com/?submit.619741 | third-party-advisory |
| https://github.com/koajs/koa/issues/1892 | issue-tracking |
| https://github.com/koajs/koa/issues/1892#issue-32… | exploitissue-tracking |
Credits
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CVE-2025-32379 (GCVE-0-2025-32379)
Vulnerability from cvelistv5 – Published: 2025-04-09 15:56 – Updated: 2025-04-09 20:45
VLAI
Title
XSS at ctx.redirect() function in Koajs
Summary
Koa is expressive middleware for Node.js using ES2017 async functions. In koa < 2.16.1 and < 3.0.0-alpha.5, passing untrusted user input to ctx.redirect() even after sanitizing it, may execute javascript code on the user who use the app. This issue is patched in 2.16.1 and 3.0.0-alpha.5.
Severity
5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/koajs/koa/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/koajs/koa/commit/ff25eb4a7f239… | x_refsource_MISC |
Impacted products
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CVE-2025-25200 (GCVE-0-2025-25200)
Vulnerability from cvelistv5 – Published: 2025-02-12 17:59 – Updated: 2025-02-12 19:29
VLAI
Title
Koa has Inefficient Regular Expression Complexity
Summary
Koa is expressive middleware for Node.js using ES2017 async functions. Prior to versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3, Koa uses an evil regex to parse the `X-Forwarded-Proto` and `X-Forwarded-Host` HTTP headers. This can be exploited to carry out a Denial-of-Service attack. Versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3 fix the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/koajs/koa/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/koajs/koa/commit/5054af6e31ffd… | x_refsource_MISC |
| https://github.com/koajs/koa/commit/5f294bb1c7c8d… | x_refsource_MISC |
| https://github.com/koajs/koa/commit/93fe903fc9666… | x_refsource_MISC |
| https://github.com/koajs/koa/blob/master/lib/requ… | x_refsource_MISC |
| https://github.com/koajs/koa/blob/master/lib/requ… | x_refsource_MISC |
| https://github.com/koajs/koa/releases/tag/2.15.4 | x_refsource_MISC |
Impacted products
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CVE-2023-49803 (GCVE-0-2023-49803)
Vulnerability from cvelistv5 – Published: 2023-12-11 22:42 – Updated: 2024-08-02 22:01
VLAI
Title
@koa/cors has overly permissive origin policy
Summary
@koa/cors npm provides Cross-Origin Resource Sharing (CORS) for koa, a web framework for Node.js. Prior to version 5.0.0, the middleware operates in a way that if an allowed origin is not provided, it will return an `Access-Control-Allow-Origin` header with the value of the origin from the request. This behavior completely disables one of the most crucial elements of browsers - the Same Origin Policy (SOP), this could cause a very serious security threat to the users of this middleware. If such behavior is expected, for instance, when middleware is used exclusively for prototypes and not for production applications, it should be heavily emphasized in the documentation along with an indication of the risks associated with such behavior, as many users may not be aware of it. Version 5.0.0 fixes this vulnerability.
Severity
8.6 (High)
CWE
- CWE-346 - Origin Validation Error
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/koajs/cors/security/advisories… | x_refsource_CONFIRM |
| https://github.com/koajs/cors/commit/f31dac99f535… | x_refsource_MISC |
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"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-346",
"description": "CWE-346: Origin Validation Error",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-12-11T22:42:17.547Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/koajs/cors/security/advisories/GHSA-qxrj-hx23-xp82",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/koajs/cors/security/advisories/GHSA-qxrj-hx23-xp82"
},
{
"name": "https://github.com/koajs/cors/commit/f31dac99f5355c41e7d4dd3c4a80c5f154941a11",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/koajs/cors/commit/f31dac99f5355c41e7d4dd3c4a80c5f154941a11"
}
],
"source": {
"advisory": "GHSA-qxrj-hx23-xp82",
"discovery": "UNKNOWN"
},
"title": "@koa/cors has overly permissive origin policy"
}
},
"cveMetadata": {
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"assignerShortName": "GitHub_M",
"cveId": "CVE-2023-49803",
"datePublished": "2023-12-11T22:42:17.547Z",
"dateReserved": "2023-11-30T13:39:50.865Z",
"dateUpdated": "2024-08-02T22:01:26.009Z",
"state": "PUBLISHED"
},
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}