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Vulnerability Details :

CVE-2026-27959

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-26 Feb, 2026 | 01:45
Updated At-26 Feb, 2026 | 19:32
Rejected At-
Credits

Koa has Host Header Injection via `ctx.hostname`

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:26 Feb, 2026 | 01:45
Updated At:26 Feb, 2026 | 19:32
Rejected At:
â–¼CVE Numbering Authority (CNA)
Koa has Host Header Injection via `ctx.hostname`

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.

Affected Products
Vendor
koajs
Product
koa
Versions
Affected
  • >= 3.0.0, < 3.1.2
  • < 2.16.4
Problem Types
TypeCWE IDDescription
CWECWE-20CWE-20: Improper Input Validation
Type: CWE
CWE ID: CWE-20
Description: CWE-20: Improper Input Validation
Metrics
VersionBase scoreBase severityVector
3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qm
x_refsource_CONFIRM
https://github.com/koajs/koa/commit/55ab9bab044ead4e82c70a30a4f9dc0fc9c1b6df
x_refsource_MISC
https://github.com/koajs/koa/commit/b76ddc01fdb703e51652b0fd131d16394cadcfeb
x_refsource_MISC
Hyperlink: https://github.com/koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qm
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/koajs/koa/commit/55ab9bab044ead4e82c70a30a4f9dc0fc9c1b6df
Resource:
x_refsource_MISC
Hyperlink: https://github.com/koajs/koa/commit/b76ddc01fdb703e51652b0fd131d16394cadcfeb
Resource:
x_refsource_MISC
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:26 Feb, 2026 | 02:16
Updated At:28 Feb, 2026 | 00:55

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Type: Secondary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CPE Matches

koajs
koajs
>>koa>>Versions before 2.16.14(exclusive)
cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*
koajs
koajs
>>koa>>Versions from 3.0.0(inclusive) to 3.1.2(exclusive)
cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*
Weaknesses
CWE IDTypeSource
CWE-20Primarysecurity-advisories@github.com
NVD-CWE-noinfoPrimarynvd@nist.gov
CWE ID: CWE-20
Type: Primary
Source: security-advisories@github.com
CWE ID: NVD-CWE-noinfo
Type: Primary
Source: nvd@nist.gov
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/koajs/koa/commit/55ab9bab044ead4e82c70a30a4f9dc0fc9c1b6dfsecurity-advisories@github.com
Patch
https://github.com/koajs/koa/commit/b76ddc01fdb703e51652b0fd131d16394cadcfebsecurity-advisories@github.com
Patch
https://github.com/koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qmsecurity-advisories@github.com
Exploit
Vendor Advisory
Hyperlink: https://github.com/koajs/koa/commit/55ab9bab044ead4e82c70a30a4f9dc0fc9c1b6df
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/koajs/koa/commit/b76ddc01fdb703e51652b0fd131d16394cadcfeb
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qm
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory

Change History

0
Information is not available yet

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Vendor-n/aOpenBSD
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CWE ID-CWE-20
Improper Input Validation
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