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Vulnerable Software

Vulnerability Details CVE-2026-74900

openssl_encrypt versions before 1.4.0 contain a critical vulnerability in pqc.py where KEM decapsulation failures silently fall back to simulation mode, generating a deterministic shared secret from only 16 bytes of the private key and publicly available encapsulated key data. Attackers who obtain 16 bytes of the private key can compute the shared secret and decrypt all ciphertext, as the fallback triggers on any KEM failure without raising an error.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.003

EPSS Ranking 26.4%

CVSS Severity

CVSS v3 Score 9.8

References

Products affected by CVE-2026-74900

Jahlives » Openssl Encrypt » Version: 0.2.2

cpe:2.3:a:jahlives:openssl_encrypt:0.2.2
Jahlives » Openssl Encrypt » Version: 0.2.3

cpe:2.3:a:jahlives:openssl_encrypt:0.2.3
Jahlives » Openssl Encrypt » Version: 0.2.4

cpe:2.3:a:jahlives:openssl_encrypt:0.2.4
Jahlives » Openssl Encrypt » Version: 0.2.5

cpe:2.3:a:jahlives:openssl_encrypt:0.2.5
Jahlives » Openssl Encrypt » Version: 0.2.6

cpe:2.3:a:jahlives:openssl_encrypt:0.2.6
Jahlives » Openssl Encrypt » Version: 0.3.0

cpe:2.3:a:jahlives:openssl_encrypt:0.3.0
Jahlives » Openssl Encrypt » Version: 0.3.1

cpe:2.3:a:jahlives:openssl_encrypt:0.3.1
Jahlives » Openssl Encrypt » Version: 0.3.2

cpe:2.3:a:jahlives:openssl_encrypt:0.3.2
Jahlives » Openssl Encrypt » Version: 0.3.3

cpe:2.3:a:jahlives:openssl_encrypt:0.3.3
Jahlives » Openssl Encrypt » Version: 0.4.0

cpe:2.3:a:jahlives:openssl_encrypt:0.4.0
Jahlives » Openssl Encrypt » Version: 0.4.1

cpe:2.3:a:jahlives:openssl_encrypt:0.4.1
Jahlives » Openssl Encrypt » Version: 0.4.2

cpe:2.3:a:jahlives:openssl_encrypt:0.4.2
Jahlives » Openssl Encrypt » Version: 0.4.3

cpe:2.3:a:jahlives:openssl_encrypt:0.4.3
Jahlives » Openssl Encrypt » Version: 0.4.4

cpe:2.3:a:jahlives:openssl_encrypt:0.4.4
Jahlives » Openssl Encrypt » Version: 0.5.0

cpe:2.3:a:jahlives:openssl_encrypt:0.5.0
Jahlives » Openssl Encrypt » Version: 0.5.1

cpe:2.3:a:jahlives:openssl_encrypt:0.5.1
Jahlives » Openssl Encrypt » Version: 0.5.3

cpe:2.3:a:jahlives:openssl_encrypt:0.5.3
Jahlives » Openssl Encrypt » Version: 0.6.0

cpe:2.3:a:jahlives:openssl_encrypt:0.6.0
Jahlives » Openssl Encrypt » Version: 0.7.0

cpe:2.3:a:jahlives:openssl_encrypt:0.7.0
Jahlives » Openssl Encrypt » Version: 0.7.1

cpe:2.3:a:jahlives:openssl_encrypt:0.7.1
Jahlives » Openssl Encrypt » Version: 0.7.2

cpe:2.3:a:jahlives:openssl_encrypt:0.7.2
Jahlives » Openssl Encrypt » Version: 0.8.0

cpe:2.3:a:jahlives:openssl_encrypt:0.8.0
Jahlives » Openssl Encrypt » Version: 0.8.1

cpe:2.3:a:jahlives:openssl_encrypt:0.8.1
Jahlives » Openssl Encrypt » Version: 0.8.2

cpe:2.3:a:jahlives:openssl_encrypt:0.8.2
Jahlives » Openssl Encrypt » Version: 0.9.2

cpe:2.3:a:jahlives:openssl_encrypt:0.9.2
Jahlives » Openssl Encrypt » Version: 1.0.0

cpe:2.3:a:jahlives:openssl_encrypt:1.0.0
Jahlives » Openssl Encrypt » Version: 1.0.1

cpe:2.3:a:jahlives:openssl_encrypt:1.0.1
Jahlives » Openssl Encrypt » Version: 1.0.2

cpe:2.3:a:jahlives:openssl_encrypt:1.0.2
Jahlives » Openssl Encrypt » Version: 1.0.3

cpe:2.3:a:jahlives:openssl_encrypt:1.0.3
Jahlives » Openssl Encrypt » Version: 1.1.0

cpe:2.3:a:jahlives:openssl_encrypt:1.1.0
Jahlives » Openssl Encrypt » Version: 1.2.0

cpe:2.3:a:jahlives:openssl_encrypt:1.2.0
Jahlives » Openssl Encrypt » Version: 1.2.1

cpe:2.3:a:jahlives:openssl_encrypt:1.2.1
Jahlives » Openssl Encrypt » Version: 1.3.0

cpe:2.3:a:jahlives:openssl_encrypt:1.3.0
Jahlives » Openssl Encrypt » Version: 1.3.1

cpe:2.3:a:jahlives:openssl_encrypt:1.3.1
Jahlives » Openssl Encrypt » Version: 1.3.2

cpe:2.3:a:jahlives:openssl_encrypt:1.3.2
Jahlives » Openssl Encrypt » Version: 1.3.3

cpe:2.3:a:jahlives:openssl_encrypt:1.3.3
Jahlives » Openssl Encrypt » Version: 1.3.4

cpe:2.3:a:jahlives:openssl_encrypt:1.3.4
Jahlives » Openssl Encrypt » Version: 1.3.5

cpe:2.3:a:jahlives:openssl_encrypt:1.3.5
Jahlives » Openssl Encrypt » Version: 1.3.6

cpe:2.3:a:jahlives:openssl_encrypt:1.3.6

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Vulnerable Software

Vulnerability Details CVE-2026-74900

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