{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-38969", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-07-02T20:39:26.220Z", "dateReserved": "2026-04-06T00:00:00.000Z", "datePublished": "2026-07-02T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-07-02T20:39:26.220Z"}, "descriptions": [{"lang": "en", "value": "ruby webrick through v1.9.2 WEBrick reparses trailer Content-Length into canonical request state, enabling request smuggling."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://github.com/ruby/webrick/pull/199"}, {"url": "https://github.com/ruby/webrick/issues/198"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}}, "dataVersion": "5.2"}

{}

{}

{"bugzilla": {"description": "webrick: rubygem-webrick: WEBrick: Request smuggling via re-parsing of Content-Length header", "id": "2496708", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496708"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L", "status": "draft"}, "cwe": "CWE-444", "details": ["ruby webrick through v1.9.2 WEBrick reparses trailer Content-Length into canonical request state, enabling request smuggling.", "A flaw was found in WEBrick, a Ruby web server toolkit. This vulnerability allows a remote attacker to perform request smuggling by manipulating the Content-Length header in HTTP/1.1 requests. WEBrick incorrectly re-parses the trailer Content-Length, leading to a desynchronization between the proxy and the backend server. This desynchronization can enable an attacker to bypass security controls, access unauthorized information, or inject malicious requests."], "mitigation": {"lang": "en:us", "value": "Do not expose WEBrick directly to untrusted network traffic. WEBrick is not designed for production use and should be replaced with a production-grade Ruby application server (e.g., Puma, Unicorn) behind a reverse proxy (e.g., nginx, Apache, HAProxy) that performs its own Content-Length validation and strips or rejects requests with conflicting transfer encoding headers.\nA patch is available: https://github.com/ruby/webrick/pull/199"}, "name": "CVE-2026-38969", "package_state": [{"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp2/backend-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp2/system-rhel7", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp2/zync-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "pcs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "critical", "package_name": "rust", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "rubygem-webrick", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite-capsule:el8/rubygem-webrick", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-07-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-38969\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-38969\nhttps://github.com/advisories/GHSA-h4w6-wx8r-p68v\nhttps://github.com/ruby/webrick/issues/198\nhttps://github.com/ruby/webrick/pull/199"], "statement": "A flaw was found in WEBrick's chunked transfer encoding parser. When processing HTTP chunked requests, WEBrick reparses trailer fields into the main request header map without filtering. An attacker can inject a forged Content-Length value via chunked trailers, which is then exposed through req['content-length'] and req.meta_vars['CONTENT_LENGTH']. Applications that trust this metadata for security-relevant decisions (e.g., body size validation, request routing) may be susceptible to request smuggling or incorrect request processing. Note that WEBrick is not intended for production use \u2014 its own documentation recommends using a production-grade server such as Puma or Unicorn for internet-facing deployments.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.9.2]"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "webrick", "vendor": "ruby"}], "created": "2026-07-03T00:30:04.974796+00:00", "updated": "2026-07-04T05:45:05.629586+00:00", "vendors": ["ruby", "ruby$PRODUCT$webrick"]}