CVE-2026-74890 jahlives CVE debrief

Who should care

Users of openssl_encrypt versions before 1.4.0; verify and apply vendor remediation to prevent authentication bypass. This includes operators, platform administrators, vulnerability management teams, and security teams who need to assess potential impact and implement necessary controls.

Technical summary

openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in CamelliaCipher; attackers with code execution can set the PYTEST_CURRENT_TEST environment variable to bypass integrity protection on encrypted data. This vulnerability affects users of openssl_encrypt versions before 1.4.0, who should verify and apply vendor remediation to prevent authentication bypass. The vulnerability exists in CamelliaCipher, disabling HMAC tag generation and verification when the PYTEST_CURRENT_TEST environment variable is set; evidence is limited to CVE and NVD details. Further verification is needed to confirm affected scope and severity.

Defensive priority

openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability; verify and apply vendor remediation.

Recommended defensive actions

• Verify openssl_encrypt version and apply vendor remediation if vulnerable
• Restrict access to sensitive data and systems
• Monitor for suspicious activity and implement compensating controls
• Review official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The vulnerability exists in CamelliaCipher, disabling HMAC tag generation and verification when the PYTEST_CURRENT_TEST environment variable is set; evidence is limited to CVE and NVD details. Further verification is needed to confirm affected scope and severity. Defenders should review official advisories and CVE records for source-provided metadata and assess potential impact on their environments.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.