Vulnerability-Lookup

CVE-2026-34181 (GCVE-0-2026-34181)

Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 16:02

Title

PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys

Summary

Issue Summary: The PKCS#12 file processing fails to perform sufficient input validation for files that use Password-Based Message Authentication Code 1 (PBMAC1) integrity mechanism allowing a certificate and private key forgery. Impact Summary: An attacker impersonating a user can cause a service reading PKCS#12 files to accept forged certificates and private keys with a 1 in 256 probability. If a service accepting PKCS#12 files is using passwords for authenticating the received files, the attacker can create unencrypted PKCS#12 files that use PBMAC1 authentication that specifies an HMAC key of only one byte, allowing them to craft a file that will be accepted with a 1 in 256 probability. That would then cause the service to accept a certificate and private key controlled by the attacker. The FIPS modules are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

Severity

7.4 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-10 16:01 UTC

CWE

CWE-354 - Improper Validation of Integrity Check Value

Assigner

openssl mitre root

References

5 references

URL	Tags
https://openssl-library.org/news/secadv/20260609.txt	vendor-advisory
https://github.com/openssl/openssl/commit/0300eb9…	patch
https://github.com/openssl/openssl/commit/ec36f24…	patch
https://github.com/openssl/openssl/commit/85dcbb3…	patch
https://github.com/openssl/openssl/commit/79eb76a…	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
OpenSSL	OpenSSL	Affected: 4.0.0 , < 4.0.1 (semver) Affected: 3.6.0 , < 3.6.3 (semver) Affected: 3.5.0 , < 3.5.7 (semver) Affected: 3.4.0 , < 3.4.6 (semver)	guessed

Date Public

2026-06-09 14:00

Credits

Pavol Žáčik (Red Hat) Alex Gaynor (Anthropic) Alicja Kario (Red Hat)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.4,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-34181",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T16:01:11.685759Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-10T16:02:19.675Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "OpenSSL",
          "vendor": "OpenSSL",
          "versions": [
            {
              "lessThan": "4.0.1",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.6.3",
              "status": "affected",
              "version": "3.6.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.5.7",
              "status": "affected",
              "version": "3.5.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.4.6",
              "status": "affected",
              "version": "3.4.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Pavol \u017d\u00e1\u010dik (Red Hat)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Alex Gaynor (Anthropic)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Alicja Kario (Red Hat)"
        }
      ],
      "datePublic": "2026-06-09T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Issue Summary: The PKCS#12 file processing fails to perform sufficient input\u003cbr\u003evalidation for files that use Password-Based Message Authentication Code 1\u003cbr\u003e(PBMAC1) integrity mechanism allowing a certificate and private key forgery.\u003cbr\u003e\u003cbr\u003eImpact Summary: An attacker impersonating a user can cause a service reading\u003cbr\u003ePKCS#12 files to accept forged certificates and private keys with a 1 in 256\u003cbr\u003eprobability.\u003cbr\u003e\u003cbr\u003eIf a service accepting PKCS#12 files is using passwords for authenticating\u003cbr\u003ethe received files, the attacker can create unencrypted PKCS#12 files that\u003cbr\u003euse PBMAC1 authentication that specifies an HMAC key of only one byte, allowing\u003cbr\u003ethem to craft a file that will be accepted with a 1 in 256 probability.\u003cbr\u003eThat would then cause the service to accept a certificate and private key\u003cbr\u003econtrolled by the attacker.\u003cbr\u003e\u003cbr\u003eThe FIPS modules are not affected by this issue, as the affected code is\u003cbr\u003eoutside the OpenSSL FIPS module boundary."
            }
          ],
          "value": "Issue Summary: The PKCS#12 file processing fails to perform sufficient input\nvalidation for files that use Password-Based Message Authentication Code 1\n(PBMAC1) integrity mechanism allowing a certificate and private key forgery.\n\nImpact Summary: An attacker impersonating a user can cause a service reading\nPKCS#12 files to accept forged certificates and private keys with a 1 in 256\nprobability.\n\nIf a service accepting PKCS#12 files is using passwords for authenticating\nthe received files, the attacker can create unencrypted PKCS#12 files that\nuse PBMAC1 authentication that specifies an HMAC key of only one byte, allowing\nthem to craft a file that will be accepted with a 1 in 256 probability.\nThat would then cause the service to accept a certificate and private key\ncontrolled by the attacker.\n\nThe FIPS modules are not affected by this issue, as the affected code is\noutside the OpenSSL FIPS module boundary."
        }
      ],
      "metrics": [
        {
          "format": "other",
          "other": {
            "content": {
              "text": "Low"
            },
            "type": "https://openssl-library.org/policies/general/security-policy/"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-354",
              "description": "CWE-354 Improper Validation of Integrity Check Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-10T07:47:53.712Z",
        "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "shortName": "openssl"
      },
      "references": [
        {
          "name": "OpenSSL Advisory",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://openssl-library.org/news/secadv/20260609.txt"
        },
        {
          "name": "4.0.1 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f"
        },
        {
          "name": "3.6.3 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81"
        },
        {
          "name": "3.5.7 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7"
        },
        {
          "name": "3.4.6 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
    "assignerShortName": "openssl",
    "cveId": "CVE-2026-34181",
    "datePublished": "2026-06-09T16:03:22.065Z",
    "dateReserved": "2026-03-26T09:29:36.013Z",
    "dateUpdated": "2026-06-10T16:02:19.675Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-34181",
      "date": "2026-09-14",
      "epss": "0.00235",
      "percentile": "0.1456"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-23T14:51:26.000Z",
      "cve": "CVE-2026-34181",
      "id": "msrc_CVE-2026-34181",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:known_not_affected": "4",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-34181.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-34181\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2026-06-09T17:17:04.740\",\"lastModified\":\"2026-07-23T08:10:00.137\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Issue Summary: The PKCS#12 file processing fails to perform sufficient input\\nvalidation for files that use Password-Based Message Authentication Code 1\\n(PBMAC1) integrity mechanism allowing a certificate and private key forgery.\\n\\nImpact Summary: An attacker impersonating a user can cause a service reading\\nPKCS#12 files to accept forged certificates and private keys with a 1 in 256\\nprobability.\\n\\nIf a service accepting PKCS#12 files is using passwords for authenticating\\nthe received files, the attacker can create unencrypted PKCS#12 files that\\nuse PBMAC1 authentication that specifies an HMAC key of only one byte, allowing\\nthem to craft a file that will be accepted with a 1 in 256 probability.\\nThat would then cause the service to accept a certificate and private key\\ncontrolled by the attacker.\\n\\nThe FIPS modules are not affected by this issue, as the affected code is\\noutside the OpenSSL FIPS module boundary.\"},{\"lang\":\"es\",\"value\":\"Resumen del problema: El procesamiento de archivos PKCS#12 no realiza una validaci\u00f3n de entrada suficiente para archivos que utilizan el mecanismo de integridad Password-Based Message Authentication Code 1 (PBMAC1), lo que permite la falsificaci\u00f3n de un certificado y una clave privada.\\n\\nResumen del impacto: Un atacante suplantando a un usuario puede hacer que un servicio que lee archivos PKCS#12 acepte certificados y claves privadas falsificados con una probabilidad de 1 entre 256.\\n\\nSi un servicio que acepta archivos PKCS#12 est\u00e1 utilizando contrase\u00f1as para la autenticaci\u00f3n de los archivos recibidos, el atacante puede crear archivos PKCS#12 sin cifrar que utilizan autenticaci\u00f3n PBMAC1 que especifica una clave HMAC de solo un byte, permiti\u00e9ndoles crear un archivo que ser\u00e1 aceptado con una probabilidad de 1 entre 256. Eso entonces har\u00eda que el servicio acepte un certificado y una clave privada controlados por el atacante.\\n\\nLos m\u00f3dulos FIPS no se ven afectados por este problema, ya que el c\u00f3digo afectado est\u00e1 fuera del l\u00edmite del m\u00f3dulo FIPS de OpenSSL.\"}],\"affected\":[{\"source\":\"openssl-security@openssl.org\",\"affectedData\":[{\"vendor\":\"OpenSSL\",\"product\":\"OpenSSL\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"4.0.0\",\"lessThan\":\"4.0.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.6.0\",\"lessThan\":\"3.6.3\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.5.0\",\"lessThan\":\"3.5.7\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.4.0\",\"lessThan\":\"3.4.6\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N\",\"baseScore\":7.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":5.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-10T16:01:11.685759Z\",\"id\":\"CVE-2026-34181\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"openssl-security@openssl.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-354\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.4.0\",\"versionEndExcluding\":\"3.4.6\",\"matchCriteriaId\":\"BF7E21E7-AEC0-4882-B1F1-2D056B506F22\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.5.0\",\"versionEndExcluding\":\"3.5.7\",\"matchCriteriaId\":\"6B6B9930-C549-4D88-9784-AF32CCDDB87A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.6.0\",\"versionEndExcluding\":\"3.6.3\",\"matchCriteriaId\":\"D41B3C45-EC73-4DC8-989D-B2E2792E102F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"6E881B9A-1A0A-4BC0-8160-20C00561167D\"}]}]}],\"references\":[{\"url\":\"https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://openssl-library.org/news/secadv/20260609.txt\",\"source\":\"openssl-security@openssl.org\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-01T12:10:54+00:00",
      "cve": "CVE-2026-34181",
      "id": "CVE-2026-34181",
      "initial_release_date": "2026-06-09T00:00:00+00:00",
      "product_status:fixed": "103",
      "product_status:known_affected": "34",
      "product_status:known_not_affected": "30",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openssl: PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34181.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.4, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-34181\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T16:01:11.685759Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-10T16:00:39.916Z\"}}], \"cna\": {\"title\": \"PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Pavol \\u017d\\u00e1\\u010dik (Red Hat)\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Alex Gaynor (Anthropic)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Alicja Kario (Red Hat)\"}], \"metrics\": [{\"other\": {\"type\": \"https://openssl-library.org/policies/general/security-policy/\", \"content\": {\"text\": \"Low\"}}, \"format\": \"other\"}], \"affected\": [{\"vendor\": \"OpenSSL\", \"product\": \"OpenSSL\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.0.0\", \"lessThan\": \"4.0.1\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.6.0\", \"lessThan\": \"3.6.3\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.5.0\", \"lessThan\": \"3.5.7\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.4.0\", \"lessThan\": \"3.4.6\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-06-09T14:00:00.000Z\", \"references\": [{\"url\": \"https://openssl-library.org/news/secadv/20260609.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f\", \"name\": \"4.0.1 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81\", \"name\": \"3.6.3 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7\", \"name\": \"3.5.7 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610\", \"name\": \"3.4.6 git commit\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Issue Summary: The PKCS#12 file processing fails to perform sufficient input\\nvalidation for files that use Password-Based Message Authentication Code 1\\n(PBMAC1) integrity mechanism allowing a certificate and private key forgery.\\n\\nImpact Summary: An attacker impersonating a user can cause a service reading\\nPKCS#12 files to accept forged certificates and private keys with a 1 in 256\\nprobability.\\n\\nIf a service accepting PKCS#12 files is using passwords for authenticating\\nthe received files, the attacker can create unencrypted PKCS#12 files that\\nuse PBMAC1 authentication that specifies an HMAC key of only one byte, allowing\\nthem to craft a file that will be accepted with a 1 in 256 probability.\\nThat would then cause the service to accept a certificate and private key\\ncontrolled by the attacker.\\n\\nThe FIPS modules are not affected by this issue, as the affected code is\\noutside the OpenSSL FIPS module boundary.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue Summary: The PKCS#12 file processing fails to perform sufficient input\u003cbr\u003evalidation for files that use Password-Based Message Authentication Code 1\u003cbr\u003e(PBMAC1) integrity mechanism allowing a certificate and private key forgery.\u003cbr\u003e\u003cbr\u003eImpact Summary: An attacker impersonating a user can cause a service reading\u003cbr\u003ePKCS#12 files to accept forged certificates and private keys with a 1 in 256\u003cbr\u003eprobability.\u003cbr\u003e\u003cbr\u003eIf a service accepting PKCS#12 files is using passwords for authenticating\u003cbr\u003ethe received files, the attacker can create unencrypted PKCS#12 files that\u003cbr\u003euse PBMAC1 authentication that specifies an HMAC key of only one byte, allowing\u003cbr\u003ethem to craft a file that will be accepted with a 1 in 256 probability.\u003cbr\u003eThat would then cause the service to accept a certificate and private key\u003cbr\u003econtrolled by the attacker.\u003cbr\u003e\u003cbr\u003eThe FIPS modules are not affected by this issue, as the affected code is\u003cbr\u003eoutside the OpenSSL FIPS module boundary.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-354\", \"description\": \"CWE-354 Improper Validation of Integrity Check Value\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-06-10T07:47:53.712Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-34181\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-10T16:02:19.675Z\", \"dateReserved\": \"2026-03-26T09:29:36.013Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-06-09T16:03:22.065Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

RHSA-2026:25239

Vulnerability from csaf_redhat - Published: 2026-06-11 13:24 - Updated: 2026-09-11 09:25

Summary

Red Hat Security Advisory: openssl security update

Severity

Important

Scope

15 vulnerabilities in this advisory, including CVE-2026-34181.

CVE-2026-34181

A flaw was found in OpenSSL. This vulnerability allows a remote attacker to forge PKCS#12 (Public-Key Cryptography Standards #12) files that use Password-Based Message Authentication Code 1 (PBMAC1) with short HMAC (Hash-based Message Authentication Code) keys. This can lead to a service accepting attacker-controlled certificates and private keys with a 1 in 256 probability, potentially enabling impersonation.

6.3 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Fixed: 49 products

https://access.redhat.com/errata/RHSA-2026:25239

Open the full advisory

RHSA-2026:26319

Vulnerability from csaf_redhat - Published: 2026-06-16 12:37 - Updated: 2026-09-11 09:25

Summary

Red Hat Security Advisory: Red Hat Update Infrastructure 5.2 security update

Severity

Important

Scope

34 vulnerabilities in this advisory, including CVE-2026-34181.

CVE-2026-34181

6.3 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Fixed: 4 products Known not affected: 1 product

https://access.redhat.com/errata/RHSA-2026:26319

Open the full advisory

RHSA-2026:29197

Vulnerability from csaf_redhat - Published: 2026-06-24 16:29 - Updated: 2026-09-11 18:17

Summary

Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage

Severity

Important

Scope

53 vulnerabilities in this advisory, including CVE-2026-34181.

CVE-2026-34181

6.3 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:29197

Open the full advisory

RHSA-2026:34102

Vulnerability from csaf_redhat - Published: 2026-07-01 08:17 - Updated: 2026-09-11 09:25

Summary

Red Hat Security Advisory: Insights proxy Container Image

Severity

Important

Scope

22 vulnerabilities in this advisory, including CVE-2026-34181.

CVE-2026-34181

6.3 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Fixed: 2 products

https://access.redhat.com/errata/RHSA-2026:34102

Open the full advisory

RHSA-2026:58981

Vulnerability from csaf_redhat - Published: 2026-08-24 11:15 - Updated: 2026-09-14 13:03

Summary

Red Hat Security Advisory: Red Hat Update Infrastructure 5.3 Technology Preview security update

Severity

Critical

Scope

118 vulnerabilities in this advisory, including CVE-2026-34181.

CVE-2026-34181

6.3 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Fixed: 3 products Known not affected: 1 product

https://access.redhat.com/errata/RHSA-2026:58981

Open the full advisory

ubuntu-cve-2026-34181

Vulnerability from osv_ubuntu

Published

2026-06-09 00:00

Modified

2026-08-27 13:53

Summary

Details

Severity

7.4 (High)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2026-34181	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-34181	REPORT
	https://openssl-library.org/news/secadv/20260609.txt	REPORT
	https://ubuntu.com/security/notices/USN-8414-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnode72",
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2"
          },
          {
            "binary_name": "nodejs",
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2"
          }
        ],
        "priority_reason": "OpenSSL developers have rated this as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "nodejs",
        "purl": "pkg:deb/ubuntu/nodejs@12.22.9~dfsg-1ubuntu3.6+esm2?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "12.22.5~dfsg-5ubuntu1",
        "12.22.7~dfsg-2ubuntu1",
        "12.22.7~dfsg-2ubuntu3",
        "12.22.9~dfsg-1ubuntu2",
        "12.22.9~dfsg-1ubuntu3",
        "12.22.9~dfsg-1ubuntu3.1",
        "12.22.9~dfsg-1ubuntu3.2",
        "12.22.9~dfsg-1ubuntu3.3",
        "12.22.9~dfsg-1ubuntu3.4",
        "12.22.9~dfsg-1ubuntu3.5",
        "12.22.9~dfsg-1ubuntu3.6",
        "12.22.9~dfsg-1ubuntu3.6+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "efi-shell-aa64",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "efi-shell-arm",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "efi-shell-ia32",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "efi-shell-loongarch64",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "efi-shell-riscv64",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "efi-shell-x64",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "ovmf",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "ovmf-ia32",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "ovmf-inteltdx",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "ovmf-legacy",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "qemu-efi-aarch64",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "qemu-efi-arm",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "qemu-efi-loongarch64",
            "binary_version": "2025.02-8ubuntu3.2"
          },
          {
            "binary_name": "qemu-efi-riscv64",
            "binary_version": "2025.02-8ubuntu3.2"
          }
        ],
        "priority_reason": "OpenSSL developers have rated this as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "edk2",
        "purl": "pkg:deb/ubuntu/edk2@2025.02-8ubuntu3.2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2025.02-3ubuntu2",
        "2025.02-8",
        "2025.02-8ubuntu1",
        "2025.02-8ubuntu2",
        "2025.02-8ubuntu3",
        "2025.02-8ubuntu3.1",
        "2025.02-8ubuntu3.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libssl3t64",
            "binary_version": "3.5.3-1ubuntu3.4"
          },
          {
            "binary_name": "openssl",
            "binary_version": "3.5.3-1ubuntu3.4"
          },
          {
            "binary_name": "openssl-provider-legacy",
            "binary_version": "3.5.3-1ubuntu3.4"
          }
        ],
        "priority_reason": "OpenSSL developers have rated this as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "openssl",
        "purl": "pkg:deb/ubuntu/openssl@3.5.3-1ubuntu3.4?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.3-1ubuntu3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.1-1ubuntu3",
        "3.5.0-2ubuntu1",
        "3.5.2-1ubuntu1",
        "3.5.3-1ubuntu2",
        "3.5.3-1ubuntu3",
        "3.5.3-1ubuntu3.3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "efi-shell-aa64",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "efi-shell-loongarch64",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "efi-shell-riscv64",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "efi-shell-x64",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "ovmf",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "ovmf-amdsev",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "ovmf-generic",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "ovmf-inteltdx",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "ovmf-legacy",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "qemu-efi-aarch64",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "qemu-efi-loongarch64",
            "binary_version": "2025.11-3ubuntu7"
          },
          {
            "binary_name": "qemu-efi-riscv64",
            "binary_version": "2025.11-3ubuntu7"
          }
        ],
        "priority_reason": "OpenSSL developers have rated this as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "edk2",
        "purl": "pkg:deb/ubuntu/edk2@2025.11-3ubuntu7?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2025.02-8ubuntu3",
        "2025.11-3ubuntu6",
        "2025.11-3ubuntu7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "efi-shell-aa64-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "efi-shell-loongarch64-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "efi-shell-riscv64-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "efi-shell-x64-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "ovmf-amdsev-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "ovmf-generic-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "ovmf-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "ovmf-inteltdx-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "ovmf-legacy-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "qemu-efi-aarch64-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "qemu-efi-loongarch64-hwe",
            "binary_version": "2025.11-3ubuntu8"
          },
          {
            "binary_name": "qemu-efi-riscv64-hwe",
            "binary_version": "2025.11-3ubuntu8"
          }
        ],
        "priority_reason": "OpenSSL developers have rated this as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "edk2-hwe",
        "purl": "pkg:deb/ubuntu/edk2-hwe@2025.11-3ubuntu8?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2025.11-3ubuntu6",
        "2025.11-3ubuntu8"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libssl3t64",
            "binary_version": "3.5.5-1ubuntu3.2"
          },
          {
            "binary_name": "openssl",
            "binary_version": "3.5.5-1ubuntu3.2"
          },
          {
            "binary_name": "openssl-provider-legacy",
            "binary_version": "3.5.5-1ubuntu3.2"
          }
        ],
        "priority_reason": "OpenSSL developers have rated this as being low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "openssl",
        "purl": "pkg:deb/ubuntu/openssl@3.5.5-1ubuntu3.2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.5-1ubuntu3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.5.3-1ubuntu2",
        "3.5.5-1ubuntu1",
        "3.5.5-1ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "Issue Summary: The PKCS#12 file processing fails to perform sufficient input validation for files that use Password-Based Message Authentication Code 1 (PBMAC1) integrity mechanism allowing a certificate and private key forgery. Impact Summary: An attacker impersonating a user can cause a service reading PKCS#12 files to accept forged certificates and private keys with a 1 in 256 probability. If a service accepting PKCS#12 files is using passwords for authenticating the received files, the attacker can create unencrypted PKCS#12 files that use PBMAC1 authentication that specifies an HMAC key of only one byte, allowing them to craft a file that will be accepted with a 1 in 256 probability. That would then cause the service to accept a certificate and private key controlled by the attacker. The FIPS modules are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.",
  "id": "UBUNTU-CVE-2026-34181",
  "modified": "2026-08-27T13:53:05Z",
  "published": "2026-06-09T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34181"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34181"
    },
    {
      "type": "REPORT",
      "url": "https://openssl-library.org/news/secadv/20260609.txt"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8414-1"
    }
  ],
  "related": [
    "USN-8414-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-34181"
  ]
}

WID-SEC-W-2026-1852

Vulnerability from csaf_certbund - Published: 2026-06-09 22:00 - Updated: 2026-08-31 22:00

Summary

OpenSSL: Mehrere Schwachstellen

Severity

Hoch

Scope

18 vulnerabilities in this advisory, including CVE-2026-34181.

CVE-2026-34181

Known affected: 33 products

Open the full advisory

WID-SEC-W-2026-2455

Vulnerability from csaf_certbund - Published: 2026-07-21 22:00 - Updated: 2026-08-10 22:00

Summary

Oracle Solaris Drittanbieterkomponenten: Mehrere Schwachstellen

Severity

Hoch

Scope

240 vulnerabilities in this advisory, including CVE-2026-34181.

CVE-2026-34181

Known affected: 5 products

Open the full advisory

WID-SEC-W-2026-2919

Vulnerability from csaf_certbund - Published: 2026-08-18 22:00 - Updated: 2026-08-31 22:00

Summary

IBM App Connect Enterprise: Mehrere Schwachstellen

Severity

Hoch

Scope

53 vulnerabilities in this advisory, including CVE-2026-34181.

CVE-2026-34181

Known affected: 4 products

Open the full advisory

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-34181 (GCVE-0-2026-34181)

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature