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CVE-2026-93573

Full vulnerability record from the local CVENow database.

Description

A flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass `Transfer-Encoding` header validation by splitting the `Transfer-Encoding` field across multiple headers, with the last field containing a non-final transfer coding like `gzip` or `deflate`. This bypass can lead to HTTP request smuggling, enabling attackers to bypass security controls, desynchronize request processing, or cause requests to be processed in an unintended context.

Severity
MEDIUM
CVSS score
6.5 (v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-09-18 15:17:21.020000
Last modified
2026-11-06 18:18:26.110000
View original CVE JSON
{
  "id": "CVE-2026-93573",
  "sourceIdentifier": "[email protected]",
  "published": "2026-09-18T15:17:21.020",
  "lastModified": "2026-11-06T18:18:26.110",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass `Transfer-Encoding` header validation by splitting the `Transfer-Encoding` field across multiple headers, with the last field containing a non-final transfer coding like `gzip` or `deflate`. This bypass can lead to HTTP request smuggling, enabling attackers to bypass security controls, desynchronize request processing, or cause requests to be processed in an unintended context."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
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  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
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          "role": "CISA Coordinator",
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  "weaknesses": [
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      "source": "[email protected]",
      "type": "Secondary",
      "description": [
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          "value": "CWE-444"
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  "references": [
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      "url": "https://access.redhat.com/errata/RHSA-2026:69440",
      "source": "[email protected]"
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      "url": "https://access.redhat.com/errata/RHSA-2026:69470",
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      "source": "[email protected]"
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}