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websafe-kb/07-framework-security/frameworks/koa/cases/koa-cve-2026-27959.md

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---
title: "Koa has Host Header Injection via ctx.hostname"
system_id: "koa"
category: "frameworks"
advisory_mode: "core"
published_date: "2026-02-26T22:42:57Z"
updated_date: "2026-02-26T23:36:36.294040Z"
severity: "low"
exploit_status: "unknown"
source_confidence: "official"
verification_status: "triage-manual"
verification_mode: "synthetic"
artifact_mode: "synthetic"
last_run_id: ""
target_types:
- "lab-local"
- "lab-public"
- "authorized-third-party"
allow_public_validation: "yes, with ownership or explicit authorization"
authorization_prerequisite: "asset ownership proof or explicit written authorization"
minimal_validation: "read-only probe, controlled payload, reversible test"
aliases:
- "CVE-2026-27959"
- "GHSA-7gcc-r8m5-44qm"
affected_versions:
- "introduced=3.0.0, fixed<3.1.2"
- "introduced=0, fixed<2.16.4"
fixed_versions:
- "3.1.2"
- "2.16.4"
entity_refs:
- "koa:system:root-system"
- "koa--project--koa:project:affected-component"
secure_code_topics:
- "proxy-trust-boundary"
- "ssrf-url-validation"
- "xss-output-encoding"
- "token-cookie-storage"
primary_source: "https://github.com/koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qm"
---
# Koa has Host Header Injection via ctx.hostname
## 本地实证状态
- 实证状态: `triage-manual`
- 实证方式: `synthetic`
- Artifact 模式: `synthetic`
- 最近运行: `-`
- 浏览器证据: `missing`
- Run Bundle: `-`
## 事件层
- Canonical ID: `koa--CVE-2026-27959`
- 系统: `koa`
- 严重度: `low`
- 来源置信度: `official`
- 官方主源: https://github.com/koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qm
- 影响版本: `introduced=3.0.0, fixed<3.1.2, introduced=0, fixed<2.16.4`
- 修复版本: `3.1.2, 2.16.4`
## 对象与版本映射
- Advisory Scope: `package`
- 影响对象: `koa`
- Entity Refs: `koa, koa--project--koa`
- 版本置信度: `high`
- 版本缺口: `-`
- 版本证据源: `https://github.com/koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qm, https://nvd.nist.gov/vuln/detail/CVE-2026-27959, https://github.com/koajs/koa/commit/55ab9bab044ead4e82c70a30a4f9dc0fc9c1b6df, https://github.com/koajs/koa/commit/b76ddc01fdb703e51652b0fd131d16394cadcfeb, https://github.com/koajs/koa`
## 受控验证流程
- Workflow ID: `koa--CVE-2026-27959--workflow`
- 漏洞家族: `xss`
- 入口面: `web-ui-render-path`
- 需要角色: `editor-or-admin`
- 触发向量: 对 `xss` 家族入口投递最小化、可审计、可回滚的受控输入，比较修复前后差异。
- 请求/页面入口: `/admin/editor, /preview, /rendered-content`
- 输入形态: 受控 HTML/Markdown/富文本输入，观察渲染上下文是否失去编码或净化。
- 预期不安全行为: 输入在目标上下文执行或被浏览器解释为主动内容。
## 其他来源
- https://nvd.nist.gov/vuln/detail/CVE-2026-27959
- https://github.com/koajs/koa/commit/55ab9bab044ead4e82c70a30a4f9dc0fc9c1b6df
- https://github.com/koajs/koa/commit/b76ddc01fdb703e51652b0fd131d16394cadcfeb
- https://github.com/koajs/koa
## 证据点与补丁验证
### 服务端证据点
- 应用日志中的命中路径、鉴权决策和异常栈
- 反向代理或边界层日志中的请求头、来源 IP 与路由决策
### 浏览器证据点
- 基线截图与攻击后截图的 DOM/视觉差异
- console、network 与 response metadata 中的异常信号
### 数据库/文件系统证据点
- 数据库中新增/越权读取的测试数据
- 文件系统中新增上传样本、缓存条目或越权读取痕迹
### 检测信号
- WAF / reverse proxy 异常日志、访问日志和告警
- 应用审计日志中的权限错误、重定向异常、模板渲染或上传落盘事件
### 补丁验证步骤
- 确认目标版本从 `introduced=3.0.0, fixed<3.1.2, introduced=0, fixed<2.16.4` 升级或回移到 `3.1.2`。
- 保留同一组受控输入，在修复前后分别执行并比对响应、日志与浏览器证据。
- 确认修复后仅保留预期业务行为，不再触发越权、回显、异常渲染或错误请求。
- 补充 `xss` 族自动化回归，避免同类路径在插件、主题或代理链中回归。
### 实验安全备注
- 只使用回环地址、哨兵目标、无害样本或可回滚测试数据。
- 禁止造成持久破坏、越权下载真实数据或不可回滚 side effect。
- 如需浏览器证据，保留 baseline / proof 两份快照以及 console / network 记录。
## 实验层
- 仅用于自有资产、测试环境或已明确授权目标。
- 允许公网可达目标，但必须满足资产归属或明确授权前提。
- 最小化验证方式: 最小化验证、只读探测、可审计回显、受控注入。
- 若该案例涉及插件、模块或扩展，应同时检查供应链与升级策略。
- 禁止场景: 无归属证明或无明确授权的公网目标；知名公共网站或与测试无关的第三方资产；会造成持久破坏、数据越权下载或不可回滚影响的动作
## 修复示例
- [javascript-typescript:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/javascript-typescript/proxy-trust-boundary.md)
- [nodejs:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/nodejs/proxy-trust-boundary.md)
- [java:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/java/proxy-trust-boundary.md)
- [php:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/php/proxy-trust-boundary.md)
- [python:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/python/proxy-trust-boundary.md)
- [ruby:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/ruby/proxy-trust-boundary.md)
- [csharp:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/csharp/proxy-trust-boundary.md)
- [go:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/go/proxy-trust-boundary.md)
- [javascript-typescript:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/javascript-typescript/ssrf-url-validation.md)
- [nodejs:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/nodejs/ssrf-url-validation.md)
- [java:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/java/ssrf-url-validation.md)
- [php:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/php/ssrf-url-validation.md)
- [python:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/python/ssrf-url-validation.md)
- [ruby:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/ruby/ssrf-url-validation.md)
- [csharp:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/csharp/ssrf-url-validation.md)
- [go:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/go/ssrf-url-validation.md)
- [javascript-typescript:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/javascript-typescript/xss-output-encoding.md)
- [nodejs:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/nodejs/xss-output-encoding.md)
- [java:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/java/xss-output-encoding.md)
- [php:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/php/xss-output-encoding.md)
- [python:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/python/xss-output-encoding.md)
- [ruby:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/ruby/xss-output-encoding.md)
- [csharp:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/csharp/xss-output-encoding.md)
- [go:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/go/xss-output-encoding.md)
- [javascript-typescript:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/javascript-typescript/token-cookie-storage.md)
- [nodejs:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/nodejs/token-cookie-storage.md)
- [java:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/java/token-cookie-storage.md)
- [php:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/php/token-cookie-storage.md)
- [python:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/python/token-cookie-storage.md)
- [ruby:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/ruby/token-cookie-storage.md)
- [csharp:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/csharp/token-cookie-storage.md)
- [go:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/go/token-cookie-storage.md)
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