CVE-2026-81718 openssl_encrypt before 1.4.9 Weak Cryptographic Parameters
Attackers can brute-force weak PBKDF2 parameters to decrypt PQC keyfiles and encrypted files, exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81718?
CVE-2026-81718 is a high-severity vulnerability in jahlives openssl_encrypt, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
openssl_encrypt versions before 1.4.9 use under-parameterized PBKDF2-HMAC-SHA256 with only 100,000 iterations to protect PQC keyfile private keys and 10,000 iterations for dual-encryption file-password verification. Attackers who obtain keyfiles or encrypted files can brute-force wrapping passwords offline using GPU or ASIC acceleration.
Weakness: CWE-326
Which versions are affected by CVE-2026-81718?
How do I fix CVE-2026-81718?
No fix has been published for CVE-2026-81718 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-81718 being exploited?
There is no known exploitation of CVE-2026-81718 in the wild and no public exploit code.
Sources
Also known as GHSA-8pv3-p4p2-f6pr, GHSA-fmjx-p826-6fvr.