diff --git a/DEV_GUIDE.md b/DEV_GUIDE.md
index cb1ffabdb..2f440d0f6 100644
--- a/DEV_GUIDE.md
+++ b/DEV_GUIDE.md
@@ -34,8 +34,8 @@
 ### 开发工具
 
 ```bash
-# golangci-lint（CI 用 v2.9，本地建议装同一版以免版本差异带来的噪音）
-go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.9
+# golangci-lint（CI 用 v2.13，本地建议装同一版以免版本差异带来的噪音）
+go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.13
 
 # pnpm (前端包管理)
 npm install -g pnpm
@@ -47,7 +47,7 @@ npm install -g pnpm
 
 | Workflow | 触发条件 | 检查内容 |
 |----------|----------|----------|
-| **backend-ci.yml** | push, pull_request | 单元测试 + 集成测试 + golangci-lint v2.9 |
+| **backend-ci.yml** | push, pull_request | 单元测试 + 集成测试 + golangci-lint v2.13 |
 | **security-scan.yml** | push, pull_request, 每周一 | govulncheck + gosec + pnpm audit |
 | **release.yml** | tag `v*` | 构建发布（PR 不触发） |
 
diff --git a/backend/.golangci.yml b/backend/.golangci.yml
index a4aed1147..08d1b61f4 100644
--- a/backend/.golangci.yml
+++ b/backend/.golangci.yml
@@ -57,10 +57,6 @@ linters:
         - G304
         - G306
         - G404
-        # G703/G704 是 G304/G107 的污点分析版：网关本职就是按配置转发到上游 URL、按配置写本地文件，
-        # 污点来源即配置本身，规则不适用。
-        - G703
-        - G704
       severity: high
       confidence: high
     errcheck:
@@ -125,6 +121,16 @@ linters:
       # Default: true — must be true, ent generates 130K+ lines of code
       generated-is-used: true
 
+  exclusions:
+    rules:
+      # G703/G704 污点分析在测试文件中只会命中 httptest mock 与测试者自设的
+      # 环境变量路径，不构成攻击面；且该分析跨环境结果不稳定（本地/CI 报告的
+      # 位置集合不同），逐点 nolint 无法收敛，故按路径豁免。生产代码不豁免，
+      # 必须逐点 //nolint:gosec 并写明信任边界。
+      - path: '_test\.go$'
+        linters: [ gosec ]
+        text: 'G70[34]'
+
 formatters:
   enable:
     - gofmt
diff --git a/backend/internal/pkg/servertiming/http.go b/backend/internal/pkg/servertiming/http.go
index e326e2430..2ad8a04ae 100644
--- a/backend/internal/pkg/servertiming/http.go
+++ b/backend/internal/pkg/servertiming/http.go
@@ -53,10 +53,10 @@ func Do(client *http.Client, req *http.Request) (*http.Response, error) {
 		client = http.DefaultClient
 	}
 	if req == nil || !Active(req.Context()) {
-		return client.Do(req)
+		return client.Do(req) //nolint:gosec // G704: 通用埋点包装器，不构造 URL；请求由调用方构造，SSRF 信任边界在调用方
 	}
 	startedAt := time.Now()
-	response, err := client.Do(req)
+	response, err := client.Do(req) //nolint:gosec // G704: 同上
 	RecordDependency(req.Context(), dependencyModule(req), startedAt, time.Now())
 	return response, err
 }
diff --git a/backend/internal/service/gateway_service.go b/backend/internal/service/gateway_service.go
index 0c0140b33..37bab2f97 100644
--- a/backend/internal/service/gateway_service.go
+++ b/backend/internal/service/gateway_service.go
@@ -1520,19 +1520,19 @@ func (s *GatewayService) initDebugGatewayBodyFile(path string) {
 	}
 
 	// 如果 path 指向一个已存在的目录，自动追加默认文件名
-	if info, err := os.Stat(path); err == nil && info.IsDir() {
+	if info, err := os.Stat(path); err == nil && info.IsDir() { //nolint:gosec // G703: path 仅来自启动环境变量 SUB2API_DEBUG_GATEWAY_BODY（运维配置），非请求输入
 		path = filepath.Join(path, debugGatewayBodyDefaultFilename)
 	}
 
 	// 确保父目录存在
 	if dir := filepath.Dir(path); dir != "." {
-		if err := os.MkdirAll(dir, 0755); err != nil {
+		if err := os.MkdirAll(dir, 0755); err != nil { //nolint:gosec // G703: 同上
 			slog.Error("failed to create gateway debug log directory", "dir", dir, "error", err)
 			return
 		}
 	}
 
-	f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644) //nolint:gosec // G703: 同上
 	if err != nil {
 		slog.Error("failed to open gateway debug log file", "path", path, "error", err)
 		return
diff --git a/backend/internal/service/pricing_service.go b/backend/internal/service/pricing_service.go
index f7733ae00..6ae24dd39 100644
--- a/backend/internal/service/pricing_service.go
+++ b/backend/internal/service/pricing_service.go
@@ -596,7 +596,7 @@ func (s *PricingService) useFallbackPricing() error {
 	}
 
 	pricingFile := s.getPricingFilePath()
-	if err := os.WriteFile(pricingFile, data, 0644); err != nil {
+	if err := os.WriteFile(pricingFile, data, 0644); err != nil { //nolint:gosec // G703: 路径为配置的数据目录 + 硬编码文件名，非请求输入
 		logger.LegacyPrintf("service.pricing", "[Pricing] Failed to copy fallback: %v", err)
 	}