CVE-2026-22795 (GCVE-0-2026-22795)

Vulnerability from cvelistv5 – Published: 2026-01-27 16:01 – Updated: 2026-10-15 01:12
VLAI
Title
Missing ASN1_TYPE validation in PKCS#12 parsing
Summary
Issue summary: An invalid or NULL pointer dereference can happen in an application processing a malformed PKCS#12 file. Impact summary: An application processing a malformed PKCS#12 file can be caused to dereference an invalid or NULL pointer on memory read, resulting in a Denial of Service. A type confusion vulnerability exists in PKCS#12 parsing code where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid pointer read. The location is constrained to a 1-byte address space, meaning any attempted pointer manipulation can only target addresses between 0x00 and 0xFF. This range corresponds to the zero page, which is unmapped on most modern operating systems and will reliably result in a crash, leading only to a Denial of Service. Exploiting this issue also requires a user or application to process a maliciously crafted PKCS#12 file. It is uncommon to accept untrusted PKCS#12 files in applications as they are usually used to store private keys which are trusted by definition. For these reasons, the issue was assessed as Low severity. The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the PKCS12 implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue. OpenSSL 1.0.2 is not affected by this issue.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-28 20:03 UTC
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
openssl CNA under the mitre root
CNA scorecard B 78/100 over 48 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
OpenSSL OpenSSL Affected: 3.6.0 , < 3.6.1 (semver)
Affected: 3.5.0 , < 3.5.5 (semver)
Affected: 3.4.0 , < 3.4.4 (semver)
Affected: 3.3.0 , < 3.3.6 (semver)
Affected: 3.0.0 , < 3.0.19 (semver)
Affected: 1.1.1 , < 1.1.1ze (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Date Public
2026-01-27 14:00
Credits
Luigino Camastra (Aisle Research) Bob Beck
Show details on NVD website
To clipboard 

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      "cve": "CVE-2026-22795",
      "id": "CVE-2026-22795",
      "initial_release_date": "2026-01-27T00:00:00+00:00",
      "product_status:fixed": "134",
      "product_status:known_affected": "54",
      "product_status:known_not_affected": "5",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openssl: OpenSSL: Denial of Service due to type confusion in PKCS#12 file processing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22795.json",
      "version": "3"
    },
    "vulnrichment": {
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          {
            "affected": [
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
                "vendor": "Siemens",
                "versions": [
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                    "lessThan": "*",
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                    "version": "0",
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            "providerMetadata": {
              "dateUpdated": "2026-10-15T01:12:20.101Z",
              "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
              "shortName": "siemens-SADP"
            },
            "references": [
              {
                "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
              }
            ],
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          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 5.5,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "REQUIRED",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-22795",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-01-28T20:03:18.604129Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-28T20:03:22.912Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "OpenSSL",
              "vendor": "OpenSSL",
              "versions": [
                {
                  "lessThan": "3.6.1",
                  "status": "affected",
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                },
                {
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                  "status": "affected",
                  "version": "3.5.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.4.4",
                  "status": "affected",
                  "version": "3.4.0",
                  "versionType": "semver"
                },
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                  "lessThan": "3.3.6",
                  "status": "affected",
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                  "versionType": "semver"
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                {
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                  "status": "affected",
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                },
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                  "version": "1.1.1",
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                }
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            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "reporter",
              "value": "Luigino Camastra (Aisle Research)"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Bob Beck"
            }
          ],
          "datePublic": "2026-01-27T14:00:00.000Z",
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              "supportingMedia": [
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                  "value": "Issue summary: An invalid or NULL pointer dereference can happen in\u003cbr\u003ean application processing a malformed PKCS#12 file.\u003cbr\u003e\u003cbr\u003eImpact summary: An application processing a malformed PKCS#12 file can be\u003cbr\u003ecaused to dereference an invalid or NULL pointer on memory read, resulting\u003cbr\u003ein a Denial of Service.\u003cbr\u003e\u003cbr\u003eA type confusion vulnerability exists in PKCS#12 parsing code where\u003cbr\u003ean ASN1_TYPE union member is accessed without first validating the type,\u003cbr\u003ecausing an invalid pointer read.\u003cbr\u003e\u003cbr\u003eThe location is constrained to a 1-byte address space, meaning any\u003cbr\u003eattempted pointer manipulation can only target addresses between 0x00 and 0xFF.\u003cbr\u003eThis range corresponds to the zero page, which is unmapped on most modern\u003cbr\u003eoperating systems and will reliably result in a crash, leading only to a\u003cbr\u003eDenial of Service. Exploiting this issue also requires a user or application\u003cbr\u003eto process a maliciously crafted PKCS#12 file. It is uncommon to accept\u003cbr\u003euntrusted PKCS#12 files in applications as they are usually used to store\u003cbr\u003eprivate keys which are trusted by definition. For these reasons, the issue\u003cbr\u003ewas assessed as Low severity.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\u003cbr\u003eas the PKCS12 implementation is outside the OpenSSL FIPS module boundary.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.\u003cbr\u003e\u003cbr\u003eOpenSSL 1.0.2 is not affected by this issue."
                }
              ],
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              "format": "other",
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                "type": "https://openssl-library.org/policies/general/security-policy/"
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              "url": "https://openssl-library.org/news/secadv/20260127.txt"
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              "url": "https://github.com/openssl/openssl/commit/ef2fb66ec571564d64d1c74a12e388a2a54d05d2"
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              "url": "https://github.com/openssl/openssl/commit/7bbca05be55b129651d9df4bdb92becc45002c12"
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              "url": "https://github.com/openssl/openssl/commit/eeee3cbd4d682095ed431052f00403004596373e"
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              "tags": [
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              ],
              "url": "https://github.com/openssl/openssl/commit/572844beca95068394c916626a6d3a490f831a49"
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          "source": {
            "discovery": "UNKNOWN"
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          "title": "Missing ASN1_TYPE validation in PKCS#12 parsing",
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        "assignerShortName": "openssl",
        "cveId": "CVE-2026-22795",
        "datePublished": "2026-01-27T16:01:27.320Z",
        "dateReserved": "2026-01-09T18:54:13.570Z",
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      },
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    }
  }
}



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Sightings

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Nomenclature

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Vulnerability timeline

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