CVE-2026-4046 (GCVE-0-2026-4046)

Vulnerability from cvelistv5 – Published: 2026-03-30 17:16 – Updated: 2026-07-14 12:45
VLAI
Title
iconv crash due to assertion failure with untrusted input
Summary
The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application. This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-30 17:33 UTC
CWE
Assigner
References
Impacted products
Date Public
2026-03-12 09:02
Credits
Rocket Ma
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-4046",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-30T17:33:59.227677Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-30T17:35:48.736Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "affected": [
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "V3.1.6",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "V3.1.6",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "V3.1.6",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "V3.1.6",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "V3.1.6",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-14T12:45:24.101Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
          }
        ],
        "x_adpType": "supplier"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "glibc",
          "vendor": "The GNU C Library",
          "versions": [
            {
              "lessThanOrEqual": "2.43",
              "status": "affected",
              "version": "2.3.3",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Rocket Ma"
        }
      ],
      "datePublic": "2026-03-12T09:02:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application.\n\u003cbr\u003e\n\u003cbr\u003eThis vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.\n\u003cbr\u003e"
            }
          ],
          "value": "The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application.\n\n\n\nThis vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-153",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-153 Input Data Manipulation"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-617",
              "description": "CWE-617 Reachable assertion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-20T21:02:31.443Z",
        "orgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18",
        "shortName": "glibc"
      },
      "references": [
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=33980"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0007;hb=HEAD"
        },
        {
          "tags": [
            "mailing-list"
          ],
          "url": "https://inbox.sourceware.org/libc-announce/76814edf-cf7f-47ec-979d-2dce0a2c76bf@gotplt.org/T/#u"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "iconv crash due to assertion failure with untrusted input",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18",
    "assignerShortName": "glibc",
    "cveId": "CVE-2026-4046",
    "datePublished": "2026-03-30T17:16:11.021Z",
    "dateReserved": "2026-03-12T10:12:32.994Z",
    "dateUpdated": "2026-07-14T12:45:24.101Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-4046",
      "date": "2026-08-14",
      "epss": "0.00382",
      "percentile": "0.31221"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-09T14:47:27.000Z",
      "cve": "CVE-2026-4046",
      "id": "msrc_CVE-2026-4046",
      "initial_release_date": "2026-04-02T01:01:22.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "4",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "iconv crash due to assertion failure with untrusted input",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-4046.json",
      "version": "4"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-4046\",\"sourceIdentifier\":\"3ff69d7a-14f2-4f67-a097-88dee7810d18\",\"published\":\"2026-03-30T18:16:19.573\",\"lastModified\":\"2026-07-14T13:18:57.707\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application.\\n\\n\\n\\nThis vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.\"},{\"lang\":\"es\",\"value\":\"La funci\u00f3n iconv() en la Biblioteca C de GNU versiones 2.43 y anteriores puede colapsar debido a un fallo de aserci\u00f3n al convertir entradas de los conjuntos de caracteres IBM1390 o IBM1399, lo que puede ser utilizado para colapsar una aplicaci\u00f3n de forma remota.\\n\\nEsta vulnerabilidad puede mitigarse trivialmente al eliminar los conjuntos de caracteres IBM1390 e IBM1399 de los sistemas que no los necesiten.\"}],\"affected\":[{\"source\":\"3ff69d7a-14f2-4f67-a097-88dee7810d18\",\"affectedData\":[{\"vendor\":\"The GNU C Library\",\"product\":\"glibc\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"2.3.3\",\"lessThanOrEqual\":\"2.43\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"V3.1.6\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"V3.1.6\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"V3.1.6\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"V3.1.6\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"V3.1.6\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-03-30T17:33:59.227677Z\",\"id\":\"CVE-2026-4046\",\"options\":[{\"exploitation\":\"poc\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"3ff69d7a-14f2-4f67-a097-88dee7810d18\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-617\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"2.43\",\"matchCriteriaId\":\"A9DB11A1-E5B8-4086-9B53-C77A9A2E0EA2\"}]}]}],\"references\":[{\"url\":\"https://inbox.sourceware.org/libc-announce/76814edf-cf7f-47ec-979d-2dce0a2c76bf@gotplt.org/T/#u\",\"source\":\"3ff69d7a-14f2-4f67-a097-88dee7810d18\"},{\"url\":\"https://sourceware.org/bugzilla/show_bug.cgi?id=33980\",\"source\":\"3ff69d7a-14f2-4f67-a097-88dee7810d18\",\"tags\":[\"Exploit\",\"Issue Tracking\",\"Patch\"]},{\"url\":\"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0007;hb=HEAD\",\"source\":\"3ff69d7a-14f2-4f67-a097-88dee7810d18\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-08T16:02:42+00:00",
      "cve": "CVE-2026-4046",
      "id": "CVE-2026-4046",
      "initial_release_date": "2026-03-30T17:16:11.021000+00:00",
      "product_status:fixed": "3045",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "glibc: glibc: Denial of Service via iconv() function with specific character sets",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4046.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-01T00:12:12Z",
      "cve": "CVE-2026-4046",
      "id": "CVE-2026-4046",
      "initial_release_date": "2026-03-31T23:29:00Z",
      "product_status:first_fixed": "1",
      "product_status:known_affected": "516",
      "product_status:known_not_affected": "56",
      "product_status:recommended": "1114",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-4046",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-4046.json",
      "version": "32"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"V3.1.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"V3.1.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"V3.1.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"V3.1.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"V3.1.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-07-14T12:45:24.101Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-4046\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-30T17:33:59.227677Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-30T17:35:44.684Z\"}}], \"cna\": {\"title\": \"iconv crash due to assertion failure with untrusted input\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Rocket Ma\"}], \"impacts\": [{\"capecId\": \"CAPEC-153\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-153 Input Data Manipulation\"}]}], \"affected\": [{\"vendor\": \"The GNU C Library\", \"product\": \"glibc\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.3.3\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"2.43\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-03-12T09:02:00.000Z\", \"references\": [{\"url\": \"https://sourceware.org/bugzilla/show_bug.cgi?id=33980\", \"tags\": [\"issue-tracking\"]}, {\"url\": \"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0007;hb=HEAD\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://inbox.sourceware.org/libc-announce/76814edf-cf7f-47ec-979d-2dce0a2c76bf@gotplt.org/T/#u\", \"tags\": [\"mailing-list\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.1\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application.\\n\\n\\n\\nThis vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application.\\n\u003cbr\u003e\\n\u003cbr\u003eThis vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.\\n\u003cbr\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-617\", \"description\": \"CWE-617 Reachable assertion\"}]}], \"providerMetadata\": {\"orgId\": \"3ff69d7a-14f2-4f67-a097-88dee7810d18\", \"shortName\": \"glibc\", \"dateUpdated\": \"2026-04-20T21:02:31.443Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-4046\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-14T12:45:24.101Z\", \"dateReserved\": \"2026-03-12T10:12:32.994Z\", \"assignerOrgId\": \"3ff69d7a-14f2-4f67-a097-88dee7810d18\", \"datePublished\": \"2026-03-30T17:16:11.021Z\", \"assignerShortName\": \"glibc\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.