CVE-2026-42767

Issue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL pointer dereference in a CMP client application.

Impact summary: A NULL pointer dereference causes a crash of the application and a Denial of Service.

An attacker controlling a CMP server (or acting as a man-in-the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format) CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs, causing a crash of the CMP client.

Applications that process untrusted CMP/CRMF 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

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42767.json",
    "cwe_ids": [
        "CWE-476"
    ],
    "cna_assigner": "openssl"
}

References

Affected packages

Git / github.com/openssl/openssl

Affected ranges

Type

GIT

Repo

https://github.com/openssl/openssl

Events

Introduced

11b7b6ea3b65a584e1d31408ed1bdb139465cffd

Fixed

1e963a8680ec78ad2072792c7a1a71f3c530bd2e

Introduced

7b371d80d959ec9ab4139d09d78e83c090de9779

Fixed

aae016bfd52fcad2bc9657c2c782cfdf73b1ed5f

Introduced

636dfadc70ce26f2473870570bfd9ec352806b1d

Fixed

8cf17aaeb4599f8af87fefd810b5b5fee90fe69e

Introduced

98acb6b02839c609ef5b837794e08d906d965335

Fixed

c5ea1cc227fd60afae8ac4b9438690bbe4888f79

Introduced

89cd17a031e022211684eb7eb41190cf1910f9fa

Fixed

51ea949dc1436e865935b47874b21a3bb31a102e

Database specific

{
    "extracted_events": [
        {
            "introduced": "4.0.0"
        },
        {
            "fixed": "4.0.1"
        },
        {
            "introduced": "3.6.0"
        },
        {
            "fixed": "3.6.3"
        },
        {
            "introduced": "3.5.0"
        },
        {
            "fixed": "3.5.7"
        },
        {
            "introduced": "3.4.0"
        },
        {
            "fixed": "3.4.6"
        },
        {
            "introduced": "3.0.0"
        },
        {
            "fixed": "3.0.21"
        }
    ],
    "source": "AFFECTED_FIELD"
}

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

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/osv-test-cve-osv-conversion/osv-output/CVE-2026-42767.json"