feat(core): Parse individual cookies from cookie header

packages/astro/src/server/middleware.ts

@@ -219,7 +219,10 @@ async function instrumentRequestStartHttpServerSpan(
             // This is here for backwards compatibility, we used to set this here before
             method,
             url: stripUrlQueryAndFragment(ctx.url.href),
-            ...httpHeadersToSpanAttributes(winterCGHeadersToDict(request.headers)),
+            ...httpHeadersToSpanAttributes(
+              winterCGHeadersToDict(request.headers),
+              getClient()?.getOptions().sendDefaultPii ?? false,
+            ),
           };
 
           if (parametrizedRoute) {

packages/bun/src/integrations/bunserver.ts

@@ -3,6 +3,7 @@ import {
   captureException,
   continueTrace,
   defineIntegration,
+  getClient,
   httpHeadersToSpanAttributes,
   isURLObjectRelative,
   parseStringToURLObject,
@@ -206,7 +207,10 @@ function wrapRequestHandler<T extends RouteHandler = RouteHandler>(
       routeName = route;
     }
 
-    Object.assign(attributes, httpHeadersToSpanAttributes(request.headers.toJSON()));
+    Object.assign(
+      attributes,
+      httpHeadersToSpanAttributes(request.headers.toJSON(), getClient()?.getOptions().sendDefaultPii ?? false),
+    );
 
     isolationScope.setSDKProcessingMetadata({
       normalizedRequest: {

packages/cloudflare/src/request.ts

@@ -3,6 +3,7 @@ import {
   captureException,
   continueTrace,
   flush,
+  getClient,
   getHttpSpanDetailsFromUrlObject,
   httpHeadersToSpanAttributes,
   parseStringToURLObject,
@@ -67,7 +68,13 @@ export function wrapRequestHandler(
       attributes['user_agent.original'] = userAgentHeader;
     }
 
-    Object.assign(attributes, httpHeadersToSpanAttributes(winterCGHeadersToDict(request.headers)));
+    Object.assign(
+      attributes,
+      httpHeadersToSpanAttributes(
+        winterCGHeadersToDict(request.headers),
+        getClient()?.getOptions().sendDefaultPii ?? false,
+      ),
+    );
 
     attributes[SEMANTIC_ATTRIBUTE_SENTRY_OP] = 'http.server';
 

packages/core/src/utils/request.ts

@@ -128,21 +128,29 @@ function getAbsoluteUrl({
   return undefined;
 }
 
-// "-user" because otherwise it would match "user-agent"
 const SENSITIVE_HEADER_SNIPPETS = [
   'auth',
   'token',
   'secret',
-  'cookie',
-  '-user',
+  'session', // for the user_session cookie
   'password',
+  'passwd',
+  'pwd',
   'key',
   'jwt',
   'bearer',
   'sso',
   'saml',
+  'crsf',
+  'xsrf',
+  'credentials',
+  // Always treat cookie headers as sensitive in case individual key-value cookie pairs cannot properly be extracted
+  'set-cookie',
+  'cookie',
 ];
 
+const PII_HEADER_SNIPPETS = ['x-forwarded-', '-user'];
+
 /**
  * Converts incoming HTTP request headers to OpenTelemetry span attributes following semantic conventions.
  * Header names are converted to the format: http.request.header.<key>
@@ -152,6 +160,7 @@ const SENSITIVE_HEADER_SNIPPETS = [
  */
 export function httpHeadersToSpanAttributes(
   headers: Record<string, string | string[] | undefined>,
+  sendDefaultPii: boolean = false,
 ): Record<string, string> {
   const spanAttributes: Record<string, string> = {};
 
@@ -161,16 +170,29 @@ export function httpHeadersToSpanAttributes(
         return;
       }
 
-      const lowerCasedKey = key.toLowerCase();
-      const isSensitive = SENSITIVE_HEADER_SNIPPETS.some(snippet => lowerCasedKey.includes(snippet));
-      const normalizedKey = `http.request.header.${lowerCasedKey.replace(/-/g, '_')}`;
+      const lowerCasedHeaderKey = key.toLowerCase();
+      const isCookieHeader = lowerCasedHeaderKey === 'cookie' || lowerCasedHeaderKey === 'set-cookie';
+
+      if (isCookieHeader && typeof value === 'string' && value !== '') {
+        // Set-Cookie: single cookie with attributes ("name=value; HttpOnly; Secure")
+        // Cookie: multiple cookies separated by "; " ("cookie1=value1; cookie2=value2")
+        const isSetCookie = lowerCasedHeaderKey === 'set-cookie';
+        const semicolonIndex = value.indexOf(';');
+        const cookieString = isSetCookie && semicolonIndex !== -1 ? value.substring(0, semicolonIndex) : value;
+        const cookies = isSetCookie ? [cookieString] : cookieString.split('; ');
+
+        for (const cookie of cookies) {
+          // Split only at the first '=' to preserve '=' characters in cookie values
+          const equalSignIndex = cookie.indexOf('=');
+          const cookieKey = equalSignIndex !== -1 ? cookie.substring(0, equalSignIndex) : cookie;
+          const cookieValue = equalSignIndex !== -1 ? cookie.substring(equalSignIndex + 1) : '';
 
-      if (isSensitive) {
-        spanAttributes[normalizedKey] = '[Filtered]';
-      } else if (Array.isArray(value)) {
-        spanAttributes[normalizedKey] = value.map(v => (v != null ? String(v) : v)).join(';');
-      } else if (typeof value === 'string') {
-        spanAttributes[normalizedKey] = value;
+          const lowerCasedCookieKey = cookieKey.toLowerCase();
+
+          addSpanAttribute(spanAttributes, lowerCasedHeaderKey, lowerCasedCookieKey, cookieValue, sendDefaultPii);
+        }
+      } else {
+        addSpanAttribute(spanAttributes, lowerCasedHeaderKey, '', value, sendDefaultPii);
       }
     });
   } catch {
@@ -180,6 +202,47 @@ export function httpHeadersToSpanAttributes(
   return spanAttributes;
 }
 
+function normalizeAttributeKey(key: string): string {
+  return key.replace(/-/g, '_');
+}
+
+function addSpanAttribute(
+  spanAttributes: Record<string, string>,
+  headerKey: string,
+  cookieKey: string,
+  value: string | string[] | undefined,
+  sendPii: boolean,
+): void {
+  const normalizedKey = cookieKey
+    ? `http.request.header.${normalizeAttributeKey(headerKey)}.${normalizeAttributeKey(cookieKey)}`
+    : `http.request.header.${normalizeAttributeKey(headerKey)}`;
+
+  const headerValue = handleHttpHeader(cookieKey || headerKey, value, sendPii);
+  if (headerValue !== undefined) {
+    spanAttributes[normalizedKey] = headerValue;
+  }
+}
+
+function handleHttpHeader(
+  lowerCasedKey: string,
+  value: string | string[] | undefined,
+  sendPii: boolean,
+): string | undefined {
+  const isSensitive = sendPii
+    ? SENSITIVE_HEADER_SNIPPETS.some(snippet => lowerCasedKey.includes(snippet))
+    : [...PII_HEADER_SNIPPETS, ...SENSITIVE_HEADER_SNIPPETS].some(snippet => lowerCasedKey.includes(snippet));
+
+  if (isSensitive) {
+    return '[Filtered]';
+  } else if (Array.isArray(value)) {
+    return value.map(v => (v != null ? String(v) : v)).join(';');
+  } else if (typeof value === 'string') {
+    return value;
+  }
+
+  return undefined;
+}
+
 /** Extract the query params from an URL. */
 export function extractQueryParamsFromUrl(url: string): string | undefined {
   // url is path and query string

packages/core/test/lib/utils/request.test.ts

@@ -527,7 +527,7 @@ describe('request utils', () => {
         'X-Forwarded-For': '192.168.1.1',
       };
 
-      const result = httpHeadersToSpanAttributes(headers);
+      const result = httpHeadersToSpanAttributes(headers, true);
 
       expect(result).toEqual({
         'http.request.header.host': 'example.com',
@@ -612,7 +612,7 @@ describe('request utils', () => {
       });
     });
 
-    describe('PII filtering', () => {
+    describe('PII/Sensitive data filtering', () => {
       it('filters sensitive headers case-insensitively', () => {
         const headers = {
           AUTHORIZATION: 'Bearer secret-token',
@@ -625,12 +625,99 @@ describe('request utils', () => {
 
         expect(result).toEqual({
           'http.request.header.content_type': 'application/json',
-          'http.request.header.cookie': '[Filtered]',
+          'http.request.header.cookie.session': '[Filtered]',
           'http.request.header.x_api_key': '[Filtered]',
           'http.request.header.authorization': '[Filtered]',
         });
       });
 
+      it('attaches and filters sensitive cookie headers', () => {
+        const headers = {
+          Cookie:
+            'session=abc123; tracking=enabled; cookie-authentication-key-without-value; theme=dark; lang=en; user_session=xyz789; pref=1',
+        };
+
+        const result = httpHeadersToSpanAttributes(headers);
+
+        expect(result).toEqual({
+          'http.request.header.cookie.session': '[Filtered]',
+          'http.request.header.cookie.tracking': 'enabled',
+          'http.request.header.cookie.theme': 'dark',
+          'http.request.header.cookie.lang': 'en',
+          'http.request.header.cookie.user_session': '[Filtered]',
+          'http.request.header.cookie.cookie_authentication_key_without_value': '[Filtered]',
+          'http.request.header.cookie.pref': '1',
+        });
+      });
+
+      it('adds a filtered cookie header when cookie header is present, but has no valid key=value pairs', () => {
+        const headers1 = { Cookie: ['key', 'val'] };
+        const result1 = httpHeadersToSpanAttributes(headers1);
+        expect(result1).toEqual({ 'http.request.header.cookie': '[Filtered]' });
+
+        const headers3 = { Cookie: '' };
+        const result3 = httpHeadersToSpanAttributes(headers3);
+        expect(result3).toEqual({ 'http.request.header.cookie': '[Filtered]' });
+      });
+
+      it.each([
+        ['preferred-color-mode=light', { 'http.request.header.set_cookie.preferred_color_mode': 'light' }],
+        ['theme=dark; HttpOnly', { 'http.request.header.set_cookie.theme': 'dark' }],
+        ['session=abc123; Domain=example.com; HttpOnly', { 'http.request.header.set_cookie.session': '[Filtered]' }],
+        ['lang=en; Expires=Wed, 21 Oct 2025 07:28:00 GMT', { 'http.request.header.set_cookie.lang': 'en' }],
+        ['pref=1; Max-Age=3600', { 'http.request.header.set_cookie.pref': '1' }],
+        ['color=blue; Path=/dashboard', { 'http.request.header.set_cookie.color': 'blue' }],
+        ['token=eyJhbGc=.eyJzdWI=.SflKxw; Secure', { 'http.request.header.set_cookie.token': '[Filtered]' }],
+        ['auth_required; HttpOnly', { 'http.request.header.set_cookie.auth_required': '[Filtered]' }],
+        ['empty=; Secure', { 'http.request.header.set_cookie.empty': '' }],
+      ])('should parse and filter Set-Cookie header: %s', (setCookieValue, expected) => {
+        const headers = { 'Set-Cookie': setCookieValue };
+        const result = httpHeadersToSpanAttributes(headers);
+        expect(result).toEqual(expected);
+      });
+
+      it('only splits cookies once between key and value, even when more equals signs are present', () => {
+        const headers = { Cookie: 'random-string=eyJhbGc=.eyJzdWI=.SflKxw' };
+        const result = httpHeadersToSpanAttributes(headers);
+        expect(result).toEqual({ 'http.request.header.cookie.random_string': 'eyJhbGc=.eyJzdWI=.SflKxw' });
+      });
+
+      it.each([
+        { sendDefaultPii: false, description: 'sendDefaultPii is false (default)' },
+        { sendDefaultPii: true, description: 'sendDefaultPii is true' },
+      ])('does not include PII headers when $description', ({ sendDefaultPii }) => {
+        const headers = {
+          'Content-Type': 'application/json',
+          'User-Agent': 'Mozilla/5.0',
+          'x-user': 'my-personal-username',
+          'X-Forwarded-For': '192.168.1.1',
+          'X-Forwarded-Host': 'example.com',
+          'X-Forwarded-Proto': 'https',
+        };
+
+        const result = httpHeadersToSpanAttributes(headers, sendDefaultPii);
+
+        if (sendDefaultPii) {
+          expect(result).toEqual({
+            'http.request.header.content_type': 'application/json',
+            'http.request.header.user_agent': 'Mozilla/5.0',
+            'http.request.header.x_user': 'my-personal-username',
+            'http.request.header.x_forwarded_for': '192.168.1.1',
+            'http.request.header.x_forwarded_host': 'example.com',
+            'http.request.header.x_forwarded_proto': 'https',
+          });
+        } else {
+          expect(result).toEqual({
+            'http.request.header.content_type': 'application/json',
+            'http.request.header.user_agent': 'Mozilla/5.0',
+            'http.request.header.x_user': '[Filtered]',
+            'http.request.header.x_forwarded_for': '[Filtered]',
+            'http.request.header.x_forwarded_host': '[Filtered]',
+            'http.request.header.x_forwarded_proto': '[Filtered]',
+          });
+        }
+      });
+
       it('always filters comprehensive list of sensitive headers', () => {
         const headers = {
           'Content-Type': 'application/json',
@@ -671,8 +758,8 @@ describe('request utils', () => {
           'http.request.header.accept': 'application/json',
           'http.request.header.host': 'example.com',
           'http.request.header.authorization': '[Filtered]',
-          'http.request.header.cookie': '[Filtered]',
-          'http.request.header.set_cookie': '[Filtered]',
+          'http.request.header.cookie.session': '[Filtered]',
+          'http.request.header.set_cookie.session': '[Filtered]',
           'http.request.header.x_api_key': '[Filtered]',
           'http.request.header.x_auth_token': '[Filtered]',
           'http.request.header.x_secret': '[Filtered]',

packages/nextjs/src/common/utils/addHeadersAsAttributes.ts

@@ -1,5 +1,5 @@
 import type { Span, WebFetchHeaders } from '@sentry/core';
-import { httpHeadersToSpanAttributes, winterCGHeadersToDict } from '@sentry/core';
+import { getClient, httpHeadersToSpanAttributes, winterCGHeadersToDict } from '@sentry/core';
 
 /**
  * Extracts HTTP request headers as span attributes and optionally applies them to a span.
@@ -17,7 +17,7 @@ export function addHeadersAsAttributes(
       ? winterCGHeadersToDict(headers as Headers)
       : headers;
 
-  const headerAttributes = httpHeadersToSpanAttributes(headersDict);
+  const headerAttributes = httpHeadersToSpanAttributes(headersDict, getClient()?.getOptions().sendDefaultPii ?? false);
 
   if (span) {
     span.setAttributes(headerAttributes);

packages/node-core/src/integrations/http/httpServerSpansIntegration.ts

@@ -157,7 +157,10 @@ const _httpServerSpansIntegration = ((options: HttpServerSpansIntegrationOptions
               'http.flavor': httpVersion,
               'net.transport': httpVersion?.toUpperCase() === 'QUIC' ? 'ip_udp' : 'ip_tcp',
               ...getRequestContentLengthAttribute(request),
-              ...httpHeadersToSpanAttributes(normalizedRequest.headers || {}),
+              ...httpHeadersToSpanAttributes(
+                normalizedRequest.headers || {},
+                client.getOptions().sendDefaultPii ?? false,
+              ),
             },
           });
 

packages/nuxt/src/runtime/hooks/wrapMiddlewareHandler.ts

@@ -2,6 +2,7 @@ import {
   captureException,
   debug,
   flushIfServerless,
+  getClient,
   httpHeadersToSpanAttributes,
   SEMANTIC_ATTRIBUTE_SENTRY_OP,
   SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN,
@@ -172,7 +173,7 @@ function getSpanAttributes(
 
   // Get headers from the Node.js request object
   const headers = event.node?.req?.headers || {};
-  const headerAttributes = httpHeadersToSpanAttributes(headers);
+  const headerAttributes = httpHeadersToSpanAttributes(headers, getClient()?.getOptions().sendDefaultPii ?? false);
 
   // Merge header attributes with existing attributes
   Object.assign(attributes, headerAttributes);

packages/remix/src/server/instrumentServer.ts

@@ -359,7 +359,10 @@ function wrapRequestHandler<T extends ServerBuild | (() => ServerBuild | Promise
                   [SEMANTIC_ATTRIBUTE_SENTRY_SOURCE]: source,
                   [SEMANTIC_ATTRIBUTE_SENTRY_OP]: 'http.server',
                   method: request.method,
-                  ...httpHeadersToSpanAttributes(winterCGHeadersToDict(request.headers)),
+                  ...httpHeadersToSpanAttributes(
+                    winterCGHeadersToDict(request.headers),
+                    clientOptions.sendDefaultPii ?? false,
+                  ),
                 },
               },
               async span => {