CVE-2026-42766

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Source
https://cve.org/CVERecord?id=CVE-2026-42766
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42766.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-42766
Downstream
ALPINE (1)
ALSA (2)
AZL (3)
BELL (1)
CGA (30)
CLSA (15)
DEBIAN (1)
ECHO (1)
JLSEC (1)
MGASA (1)
MINI (2)
OESA (11)
openSUSE (2)
RHSA (10)
RLSA (2)
ROOT (1)
SUSE (15)
UBUNTU (1)
Related
ALSA (2)
openSUSE (2)
SUSE (15)
Published
2026-06-09T16:03:26Z
Modified
2026-11-11T13:23:10Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Possible NULL Dereference in Password-Based CMS Decryption
Details

Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption.

Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service.

The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it was present.

An attacker who supplies such a CMS message to an application performing password-based CMS decryption can trigger an application crash, leading to a Denial of Service.

Applications that process password-encrypted CMS messages may be affected.

The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

Database specific 
{
    "cna_assigner": "openssl",
    "cwe_ids": [
        "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42766.json"
}
References

Affected packages

Git / github.com/alsyundawy/openssl-1.0.2

Affected ranges

Type
GIT
Repo
https://github.com/alsyundawy/openssl-1.0.2
Events
Introduced
c46078156d49453ba69badc9addb1e2dcd1c71f5
Fixed
c46078156d49453ba69badc9addb1e2dcd1c71f5
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "1.0.2"
                },
                {
                    "fixed": "1.0.2zq"
                }
            ],
            "source": "CPE_RANGE"
        }
    ]
}
Type
GIT
Repo
https://github.com/kzalewski/openssl-1.1.1
Events
Introduced
9ad69b994ae7c73ba06d9f75efd2625102de814c
Fixed
9ad69b994ae7c73ba06d9f75efd2625102de814c
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "1.1.1"
                },
                {
                    "fixed": "1.1.1zh"
                }
            ],
            "source": "CPE_RANGE"
        }
    ]
}
Type
GIT
Repo
https://github.com/openssl/openssl
Events
Introduced
e818b74be2170fbe957a07b0da4401c2b694b3b8
Fixed
e818b74be2170fbe957a07b0da4401c2b694b3b8
Introduced
e04bd3433fd84e1861bf258ea37928d9845e6a86
Fixed
e04bd3433fd84e1861bf258ea37928d9845e6a86
Introduced
89cd17a031e022211684eb7eb41190cf1910f9fa
Fixed
51ea949dc1436e865935b47874b21a3bb31a102e
Introduced
98acb6b02839c609ef5b837794e08d906d965335
Fixed
c5ea1cc227fd60afae8ac4b9438690bbe4888f79
Introduced
636dfadc70ce26f2473870570bfd9ec352806b1d
Fixed
8cf17aaeb4599f8af87fefd810b5b5fee90fe69e
Introduced
7b371d80d959ec9ab4139d09d78e83c090de9779
Fixed
aae016bfd52fcad2bc9657c2c782cfdf73b1ed5f
Introduced
11b7b6ea3b65a584e1d31408ed1bdb139465cffd
Fixed
056d06c1918fafbb98c1c85a02e4c47cc4e199ce
Fixed
12bc26ffb3a2be728c9b86e1cae277de5b33dfa4
Fixed
3ff64913615d648cfbb6a6f1cf5529ae7ea829d7
Fixed
ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4
Fixed
da26f368732b83e40e9d356fe61c3d3aaab6d2e8
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "1.0.2"
                },
                {
                    "fixed": "1.0.2zq"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "1.1.1"
                },
                {
                    "fixed": "1.1.1zh"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "3.0.0"
                },
                {
                    "fixed": "3.0.21"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "3.4.0"
                },
                {
                    "fixed": "3.4.6"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "3.5.0"
                },
                {
                    "fixed": "3.5.7"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "3.6.0"
                },
                {
                    "fixed": "3.6.3"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "4.0.0-NA"
                },
                {
                    "last_affected": "4.0.0-NA"
                }
            ],
            "source": "CPE_STRING"
        },
        {
            "range": [
                {
                    "fixed": "056d06c1918fafbb98c1c85a02e4c47cc4e199ce"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "12bc26ffb3a2be728c9b86e1cae277de5b33dfa4"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "3ff64913615d648cfbb6a6f1cf5529ae7ea829d7"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "da26f368732b83e40e9d356fe61c3d3aaab6d2e8"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

3.*
3.0-POST-CLANG-FORMAT-WEBKIT
3.0-PRE-CLANG-FORMAT-WEBKIT
3.4-POST-CLANG-FORMAT-WEBKIT
3.4-PRE-CLANG-FORMAT-WEBKIT
3.5-POST-CLANG-FORMAT-WEBKIT
3.5-PRE-CLANG-FORMAT-WEBKIT
3.6-POST-CLANG-FORMAT-WEBKIT
3.6-PRE-CLANG-FORMAT-WEBKIT
4.*
4.0.0-NA
openssl-3.*
openssl-3.0.0
openssl-3.0.1
openssl-3.0.10
openssl-3.0.11
openssl-3.0.12
openssl-3.0.13
openssl-3.0.14
openssl-3.0.15
openssl-3.0.16
openssl-3.0.17
openssl-3.0.18
openssl-3.0.19
openssl-3.0.2
openssl-3.0.20
openssl-3.0.3
openssl-3.0.4
openssl-3.0.5
openssl-3.0.6
openssl-3.0.7
openssl-3.0.8
openssl-3.0.9
openssl-3.4.0
openssl-3.4.1
openssl-3.4.2
openssl-3.4.3
openssl-3.4.4
openssl-3.4.5
openssl-3.5.0
openssl-3.5.1
openssl-3.5.2
openssl-3.5.3
openssl-3.5.4
openssl-3.5.5
openssl-3.5.6
openssl-3.6.0
openssl-3.6.1
openssl-3.6.2
openssl-4.*
openssl-4.0.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42766.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "42797208737688127763066522181332281160",
            "length": 507
        },
        "id": "CVE-2026-42766-17161750",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/kzalewski/openssl-1.1.1/commit/9ad69b994ae7c73ba06d9f75efd2625102de814c",
        "target": {
            "file": "test/ec_internal_test.c",
            "function": "setup_tests"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
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                "68454496777232705137616949383570055801",
                "174227485603324825134703660955423564225",
                "306374039697804480350160125378658725435",
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                "305852724676774806958748002571762917320",
                "61902118637910596077004663207701223681",
                "278724473247779637198513168995006009135",
                "150804929727413209120953746872414715465",
                "166774358343717215765245239236385866693",
                "116293081894868411264108492273509366961",
                "326496170417124709669304286305887789679",
                "278306348133167756990680493182074324125",
                "189649085256091224929149730235838635518",
                "82945606976757935725900546138315651129",
                "136187505923069729147869676886657763243",
                "233447734599456461300796481665382809870",
                "116930820689846462220149337293161556595",
                "153181275943870954612030432229689150702",
                "65985025876624501603393736976041980125"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-42766-3349f255",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/kzalewski/openssl-1.1.1/commit/9ad69b994ae7c73ba06d9f75efd2625102de814c",
        "target": {
            "file": "crypto/bn/bn_gf2m.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "19932538006445405886619871605822265419",
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                "169873427985165747128009845229956313367"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-42766-39e4c5df",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4",
        "target": {
            "file": "crypto/cms/cms_pwri.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "330992325606853768865589272126885804627",
            "length": 2346
        },
        "id": "CVE-2026-42766-3f58ddad",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4",
        "target": {
            "file": "crypto/cms/cms_pwri.c",
            "function": "ossl_cms_RecipientInfo_pwri_crypt"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "30673062630639656303483208802482655434",
            "length": 494
        },
        "id": "CVE-2026-42766-4f7f516c",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/kzalewski/openssl-1.1.1/commit/9ad69b994ae7c73ba06d9f75efd2625102de814c",
        "target": {
            "file": "crypto/bn/bn_gf2m.c",
            "function": "BN_GF2m_poly2arr"
        }
    },
    {
        "deprecated": false,
        "digest": {
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                "169873427985165747128009845229956313367"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-42766-586dda67",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4",
        "target": {
            "file": "crypto/cms/cms_pwri.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "178284375691898183426538972700556073091",
            "length": 2407
        },
        "id": "CVE-2026-42766-63588065",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7",
        "target": {
            "file": "crypto/cms/cms_pwri.c",
            "function": "ossl_cms_RecipientInfo_pwri_crypt"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "330992325606853768865589272126885804627",
            "length": 2346
        },
        "id": "CVE-2026-42766-86db3db7",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce",
        "target": {
            "file": "crypto/cms/cms_pwri.c",
            "function": "ossl_cms_RecipientInfo_pwri_crypt"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "19932538006445405886619871605822265419",
                "174261661292693472232738228136053330340",
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            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-42766-a030dfd1",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce",
        "target": {
            "file": "crypto/cms/cms_pwri.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "329591667534356058110839666717866069932",
            "length": 2356
        },
        "id": "CVE-2026-42766-abd8d29b",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4",
        "target": {
            "file": "crypto/cms/cms_pwri.c",
            "function": "ossl_cms_RecipientInfo_pwri_crypt"
        }
    },
    {
        "deprecated": false,
        "digest": {
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        "id": "CVE-2026-42766-c377fa22",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/e04bd3433fd84e1861bf258ea37928d9845e6a86",
        "target": {
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        }
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        "id": "CVE-2026-42766-f114ceb6",
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        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8",
        "target": {
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        }
    },
    {
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        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/kzalewski/openssl-1.1.1/commit/9ad69b994ae7c73ba06d9f75efd2625102de814c",
        "target": {
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        }
    },
    {
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        "digest": {
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            "threshold": 0.9
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        "id": "CVE-2026-42766-fa870959",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/kzalewski/openssl-1.1.1/commit/9ad69b994ae7c73ba06d9f75efd2625102de814c",
        "target": {
            "file": "include/openssl/opensslv.h"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "329591667534356058110839666717866069932",
            "length": 2356
        },
        "id": "CVE-2026-42766-fd4f30cd",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8",
        "target": {
            "file": "crypto/cms/cms_pwri.c",
            "function": "ossl_cms_RecipientInfo_pwri_crypt"
        }
    }
]
vanir_signatures_modified 
"2026-11-11T13:23:10Z"