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System.Text.RegularExpressions, system.text.regularexpressions — security advisory

Type: advisorySources: OSVAdvisory ID: ECHO-495f-20f1-b39d

This notice tracks CVE-2019-0820 for System.Text.RegularExpressions, system.text.regularexpressions. Fixed versions are listed in the package details.

Products
System.Text.RegularExpressions, system.text.regularexpressions
Affected versions
Not specified
Fixed versions
4.3.0+echo.1, 4.3.1
CVEs
CVE-2019-0820
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 16:41 UTC · Revision 1

Source evidence

ECHO-495f-20f1-b39d

core-osv · Original source

Published 17 Sept 2026, 08:05 UTC

ECHO-495f-20f1-b39d

osv:ECHO-495f-20f1-b39d

system.text.regularexpressions

Fixed versions: 4.3.1

System.Text.RegularExpressions

Fixed versions: 4.3.0+echo.1

Complete source record
{
  "id": "f74c4a6ee6b31d6820cc8f25ff5be271828cbd6270c51da48caf95f462954d89",
  "url": "https://osv.dev/vulnerability/ECHO-495f-20f1-b39d",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ECHO-495f-20f1-b39d",
    "summary": "ECHO-495f-20f1-b39d",
    "evidence": "osv:ECHO-495f-20f1-b39d",
    "products": [
      {
        "name": {
          "value": "system.text.regularexpressions",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.3.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "System.Text.RegularExpressions",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.3.0+echo.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "ECHO-495f-20f1-b39d",
      "aliases": [
        "ECHO-495f-20f1-b39d"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.3.1"
                }
              ]
            }
          ],
          "package": {
            "name": "system.text.regularexpressions",
            "purl": "pkg:nuget/system.text.regularexpressions",
            "ecosystem": "Echo:NuGet"
          },
          "database_specific": {
            "source": "https://advisory.echohq.com/osv/ECHO-495f-20f1-b39d.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.3.0+echo.1"
                }
              ]
            }
          ],
          "package": {
            "name": "System.Text.RegularExpressions",
            "purl": "pkg:nuget/System.Text.RegularExpressions",
            "ecosystem": "Echo:NuGet"
          },
          "database_specific": {
            "source": "https://advisory.echohq.com/osv/ECHO-495f-20f1-b39d.json"
          }
        }
      ],
      "modified": "2026-10-22T00:45:04.115351465Z",
      "provider": "osv",
      "upstream": [
        "CVE-2019-0820",
        "GHSA-cmhx-cq75-c4mj"
      ],
      "references": [
        "https://advisory.echohq.com/cve/CVE-2019-0820",
        "https://github.com/advisories/GHSA-cmhx-cq75-c4mj"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2019-0820",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 401191,
  "published_at": "2026-09-17T08:05:27.486+00:00"
}