CVE-2026-81699

Summary

openssl_encrypt versions before 1.4.9 fail to properly validate key derivation function costs in crafted files, allowing attackers to trigger unbounded memory and CPU exhaustion during pre-authentication processing. Attackers can supply malicious files with excessive KDF parameters to exhaust system resources and crash or wedge the process before password verification occurs.

Affected Software

Weaknesses

• CWE-770: Allocation of Resources Without Limits or Throttling

References

• https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-phmr-p567-q5g6
• https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-denial-of-service-via-unbounded-kdf-cost

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