CVE-2026-22796

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Source
https://cve.org/CVERecord?id=CVE-2026-22796
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-22796.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-22796
Downstream
Related
Published
2026-01-27T16:16:35.543Z
Modified
2026-02-17T07:22:01.283834Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
[none]
Details

Issue summary: A type confusion vulnerability exists in the signature verification of signed PKCS#7 data where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid or NULL pointer dereference when processing malformed PKCS#7 data.

Impact summary: An application performing signature verification of PKCS#7 data or calling directly the PKCS7digestfrom_attributes() function can be caused to dereference an invalid or NULL pointer when reading, resulting in a Denial of Service.

The function PKCS7digestfromattributes() accesses the message digest attribute value without validating its type. When the type is not VASN1OCTETSTRING, this results in accessing invalid memory through the ASN1_TYPE union, causing a crash.

Exploiting this vulnerability requires an attacker to provide a malformed signed PKCS#7 to an application that verifies it. The impact of the exploit is just a Denial of Service, the PKCS7 API is legacy and applications should be using the CMS API instead. 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 PKCS#7 parsing implementation is outside the OpenSSL FIPS module boundary.

OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.

References

Affected packages

Git / github.com/openssl/openssl

Affected ranges

Type
GIT
Repo
https://github.com/openssl/openssl
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
2502e7b7d4c0cf4f972a881641fe09edc67aeec4
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
572844beca95068394c916626a6d3a490f831a49
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
7bbca05be55b129651d9df4bdb92becc45002c12
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
eeee3cbd4d682095ed431052f00403004596373e
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ef2fb66ec571564d64d1c74a12e388a2a54d05d2
Introduced
4cb31128b5790819dfeea2739fbde265f71a10a2
Fixed
4601ff25acd6c2fe58a8bfe241e6c470e27b8074
Introduced
636dfadc70ce26f2473870570bfd9ec352806b1d
Fixed
67b5686b4419b4cb8caa502711c41815f5279751
Introduced
7b371d80d959ec9ab4139d09d78e83c090de9779
Fixed
c9a9e5b10105ad850b6e4d1122c645c67767c341
Introduced
89cd17a031e022211684eb7eb41190cf1910f9fa
Fixed
a22063cd69a077cc68bb4c10e9f351f75899b194
Introduced
98acb6b02839c609ef5b837794e08d906d965335
Fixed
565bdcc41bbf89fcbaf962636469332689f0c9fd

Affected versions

3.*
3.0-POST-CLANG-FORMAT-WEBKIT
3.0-PRE-CLANG-FORMAT-WEBKIT
3.3-POST-CLANG-FORMAT-WEBKIT
3.3-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
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-3.0.2
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-3.3.0
openssl-3.3.1
openssl-3.3.2
openssl-3.3.3
openssl-3.3.4
openssl-3.3.5
openssl-3.4.0
openssl-3.4.1
openssl-3.4.2
openssl-3.4.3
openssl-3.5.0
openssl-3.5.1
openssl-3.5.2
openssl-3.5.3
openssl-3.5.4
openssl-3.6.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-22796.json"
vanir_signatures 
[
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        "id": "CVE-2026-22796-09b46f75",
        "target": {
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        },
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        "deprecated": false,
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        },
        "signature_type": "Line"
    },
    {
        "id": "CVE-2026-22796-0b6c52aa",
        "target": {
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            "file": "apps/s_client.c"
        },
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        "deprecated": false,
        "source": "https://github.com/openssl/openssl/commit/ef2fb66ec571564d64d1c74a12e388a2a54d05d2",
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        "signature_type": "Function"
    },
    {
        "id": "CVE-2026-22796-135694a1",
        "target": {
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        "signature_type": "Function"
    },
    {
        "id": "CVE-2026-22796-1be6bf98",
        "target": {
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        },
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        },
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    },
    {
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        },
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        },
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    {
        "id": "CVE-2026-22796-5e98e146",
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        },
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        "id": "CVE-2026-22796-68a85aee",
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        },
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]