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openssl_encrypt versions before 1.4.0 contain an insecure default configuration that trusts the entire RFC 1918 private
openssl_encrypt versions before 1.4.0 contain an insecure default configuration that trusts the entire RFC 1918 private address space in IntegrityProxyConfig trusted_proxies. Attackers on private networks can forge client certificate headers to bypass mTLS authentication when ProxyAuth validation is relaxed or modified.
Affected packages
- openssl-encrypt— before 1.4.0
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-2592-7m3g-7fq6
- https://www.vulncheck.com/advisories/openssl-encrypt-before-insecure-default-configuration
Structured record: https://osv.dev/vulnerability/PYSEC-2026-3744
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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