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Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-42766

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 43.3%
CVSS Severity
CVSS v3 Score 5.9
Products affected by CVE-2026-42766
  • Openssl » Openssl » Version: 1.0.2
    cpe:2.3:a:openssl:openssl:1.0.2
  • Openssl » Openssl » Version: 1.0.2a
    cpe:2.3:a:openssl:openssl:1.0.2a
  • Openssl » Openssl » Version: 1.0.2b
    cpe:2.3:a:openssl:openssl:1.0.2b
  • Openssl » Openssl » Version: 1.0.2c
    cpe:2.3:a:openssl:openssl:1.0.2c
  • Openssl » Openssl » Version: 1.0.2d
    cpe:2.3:a:openssl:openssl:1.0.2d
  • Openssl » Openssl » Version: 1.0.2e
    cpe:2.3:a:openssl:openssl:1.0.2e
  • Openssl » Openssl » Version: 1.0.2f
    cpe:2.3:a:openssl:openssl:1.0.2f
  • Openssl » Openssl » Version: 1.0.2g
    cpe:2.3:a:openssl:openssl:1.0.2g
  • Openssl » Openssl » Version: 1.0.2h
    cpe:2.3:a:openssl:openssl:1.0.2h
  • Openssl » Openssl » Version: 1.0.2i
    cpe:2.3:a:openssl:openssl:1.0.2i
  • Openssl » Openssl » Version: 1.0.2j
    cpe:2.3:a:openssl:openssl:1.0.2j
  • Openssl » Openssl » Version: 1.0.2k
    cpe:2.3:a:openssl:openssl:1.0.2k
  • Openssl » Openssl » Version: 1.0.2l
    cpe:2.3:a:openssl:openssl:1.0.2l
  • Openssl » Openssl » Version: 1.0.2m
    cpe:2.3:a:openssl:openssl:1.0.2m
  • Openssl » Openssl » Version: 1.0.2n
    cpe:2.3:a:openssl:openssl:1.0.2n
  • Openssl » Openssl » Version: 1.0.2o
    cpe:2.3:a:openssl:openssl:1.0.2o
  • Openssl » Openssl » Version: 1.0.2p
    cpe:2.3:a:openssl:openssl:1.0.2p
  • Openssl » Openssl » Version: 1.0.2q
    cpe:2.3:a:openssl:openssl:1.0.2q
  • Openssl » Openssl » Version: 1.0.2r
    cpe:2.3:a:openssl:openssl:1.0.2r
  • Openssl » Openssl » Version: 1.0.2s
    cpe:2.3:a:openssl:openssl:1.0.2s
  • Openssl » Openssl » Version: 1.0.2t
    cpe:2.3:a:openssl:openssl:1.0.2t
  • Openssl » Openssl » Version: 1.0.2u
    cpe:2.3:a:openssl:openssl:1.0.2u
  • Openssl » Openssl » Version: 1.0.2v
    cpe:2.3:a:openssl:openssl:1.0.2v
  • Openssl » Openssl » Version: 1.0.2w
    cpe:2.3:a:openssl:openssl:1.0.2w
  • Openssl » Openssl » Version: 1.0.2x
    cpe:2.3:a:openssl:openssl:1.0.2x
  • Openssl » Openssl » Version: 1.0.2y
    cpe:2.3:a:openssl:openssl:1.0.2y
  • Openssl » Openssl » Version: 1.0.2za
    cpe:2.3:a:openssl:openssl:1.0.2za
  • Openssl » Openssl » Version: 1.0.2zb
    cpe:2.3:a:openssl:openssl:1.0.2zb
  • Openssl » Openssl » Version: 1.0.2zc
    cpe:2.3:a:openssl:openssl:1.0.2zc
  • Openssl » Openssl » Version: 1.0.2zd
    cpe:2.3:a:openssl:openssl:1.0.2zd
  • Openssl » Openssl » Version: 1.0.2ze
    cpe:2.3:a:openssl:openssl:1.0.2ze
  • Openssl » Openssl » Version: 1.0.2zf
    cpe:2.3:a:openssl:openssl:1.0.2zf
  • Openssl » Openssl » Version: 1.0.2zg
    cpe:2.3:a:openssl:openssl:1.0.2zg
  • Openssl » Openssl » Version: 1.0.2zh
    cpe:2.3:a:openssl:openssl:1.0.2zh
  • Openssl » Openssl » Version: 1.0.2zi
    cpe:2.3:a:openssl:openssl:1.0.2zi
  • Openssl » Openssl » Version: 1.0.2zj
    cpe:2.3:a:openssl:openssl:1.0.2zj
  • Openssl » Openssl » Version: 1.0.2zn
    cpe:2.3:a:openssl:openssl:1.0.2zn
  • Openssl » Openssl » Version: 1.1.1
    cpe:2.3:a:openssl:openssl:1.1.1
  • Openssl » Openssl » Version: 1.1.1a
    cpe:2.3:a:openssl:openssl:1.1.1a
  • Openssl » Openssl » Version: 1.1.1b
    cpe:2.3:a:openssl:openssl:1.1.1b
  • Openssl » Openssl » Version: 1.1.1c
    cpe:2.3:a:openssl:openssl:1.1.1c
  • Openssl » Openssl » Version: 1.1.1d
    cpe:2.3:a:openssl:openssl:1.1.1d
  • Openssl » Openssl » Version: 1.1.1e
    cpe:2.3:a:openssl:openssl:1.1.1e
  • Openssl » Openssl » Version: 1.1.1f
    cpe:2.3:a:openssl:openssl:1.1.1f
  • Openssl » Openssl » Version: 1.1.1g
    cpe:2.3:a:openssl:openssl:1.1.1g
  • Openssl » Openssl » Version: 1.1.1h
    cpe:2.3:a:openssl:openssl:1.1.1h
  • Openssl » Openssl » Version: 1.1.1i
    cpe:2.3:a:openssl:openssl:1.1.1i
  • Openssl » Openssl » Version: 1.1.1j
    cpe:2.3:a:openssl:openssl:1.1.1j
  • Openssl » Openssl » Version: 1.1.1k
    cpe:2.3:a:openssl:openssl:1.1.1k
  • Openssl » Openssl » Version: 1.1.1l
    cpe:2.3:a:openssl:openssl:1.1.1l
  • Openssl » Openssl » Version: 1.1.1m
    cpe:2.3:a:openssl:openssl:1.1.1m
  • Openssl » Openssl » Version: 1.1.1n
    cpe:2.3:a:openssl:openssl:1.1.1n
  • Openssl » Openssl » Version: 1.1.1o
    cpe:2.3:a:openssl:openssl:1.1.1o
  • Openssl » Openssl » Version: 1.1.1p
    cpe:2.3:a:openssl:openssl:1.1.1p
  • Openssl » Openssl » Version: 1.1.1q
    cpe:2.3:a:openssl:openssl:1.1.1q
  • Openssl » Openssl » Version: 1.1.1r
    cpe:2.3:a:openssl:openssl:1.1.1r
  • Openssl » Openssl » Version: 1.1.1s
    cpe:2.3:a:openssl:openssl:1.1.1s
  • Openssl » Openssl » Version: 1.1.1t
    cpe:2.3:a:openssl:openssl:1.1.1t
  • Openssl » Openssl » Version: 1.1.1u
    cpe:2.3:a:openssl:openssl:1.1.1u
  • Openssl » Openssl » Version: 1.1.1v
    cpe:2.3:a:openssl:openssl:1.1.1v
  • Openssl » Openssl » Version: 1.1.1w
    cpe:2.3:a:openssl:openssl:1.1.1w
  • Openssl » Openssl » Version: 1.1.1x
    cpe:2.3:a:openssl:openssl:1.1.1x
  • Openssl » Openssl » Version: 1.1.1ze
    cpe:2.3:a:openssl:openssl:1.1.1ze
  • Openssl » Openssl » Version: 3.0.0
    cpe:2.3:a:openssl:openssl:3.0.0
  • Openssl » Openssl » Version: 3.0.1
    cpe:2.3:a:openssl:openssl:3.0.1
  • Openssl » Openssl » Version: 3.0.10
    cpe:2.3:a:openssl:openssl:3.0.10
  • Openssl » Openssl » Version: 3.0.11
    cpe:2.3:a:openssl:openssl:3.0.11
  • Openssl » Openssl » Version: 3.0.12
    cpe:2.3:a:openssl:openssl:3.0.12
  • Openssl » Openssl » Version: 3.0.13
    cpe:2.3:a:openssl:openssl:3.0.13
  • Openssl » Openssl » Version: 3.0.14
    cpe:2.3:a:openssl:openssl:3.0.14
  • Openssl » Openssl » Version: 3.0.15
    cpe:2.3:a:openssl:openssl:3.0.15
  • Openssl » Openssl » Version: 3.0.19
    cpe:2.3:a:openssl:openssl:3.0.19
  • Openssl » Openssl » Version: 3.0.2
    cpe:2.3:a:openssl:openssl:3.0.2
  • Openssl » Openssl » Version: 3.0.3
    cpe:2.3:a:openssl:openssl:3.0.3
  • Openssl » Openssl » Version: 3.0.4
    cpe:2.3:a:openssl:openssl:3.0.4
  • Openssl » Openssl » Version: 3.0.5
    cpe:2.3:a:openssl:openssl:3.0.5
  • Openssl » Openssl » Version: 3.0.6
    cpe:2.3:a:openssl:openssl:3.0.6
  • Openssl » Openssl » Version: 3.0.7
    cpe:2.3:a:openssl:openssl:3.0.7
  • Openssl » Openssl » Version: 3.0.8
    cpe:2.3:a:openssl:openssl:3.0.8
  • Openssl » Openssl » Version: 3.0.9
    cpe:2.3:a:openssl:openssl:3.0.9
  • Openssl » Openssl » Version: 3.4.0
    cpe:2.3:a:openssl:openssl:3.4.0
  • Openssl » Openssl » Version: 3.4.1
    cpe:2.3:a:openssl:openssl:3.4.1
  • Openssl » Openssl » Version: 3.4.2
    cpe:2.3:a:openssl:openssl:3.4.2
  • Openssl » Openssl » Version: 3.4.3
    cpe:2.3:a:openssl:openssl:3.4.3
  • Openssl » Openssl » Version: 3.4.4
    cpe:2.3:a:openssl:openssl:3.4.4
  • Openssl » Openssl » Version: 3.5.0
    cpe:2.3:a:openssl:openssl:3.5.0
  • Openssl » Openssl » Version: 3.5.1
    cpe:2.3:a:openssl:openssl:3.5.1
  • Openssl » Openssl » Version: 3.5.2
    cpe:2.3:a:openssl:openssl:3.5.2
  • Openssl » Openssl » Version: 3.5.3
    cpe:2.3:a:openssl:openssl:3.5.3
  • Openssl » Openssl » Version: 3.5.4
    cpe:2.3:a:openssl:openssl:3.5.4
  • Openssl » Openssl » Version: 3.5.5
    cpe:2.3:a:openssl:openssl:3.5.5
  • Openssl » Openssl » Version: 3.6.0
    cpe:2.3:a:openssl:openssl:3.6.0
  • Openssl » Openssl » Version: 3.6.1
    cpe:2.3:a:openssl:openssl:3.6.1
  • Openssl » Openssl » Version: 4.0.0
    cpe:2.3:a:openssl:openssl:4.0.0


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