{"id":"CVE-2026-74882","aliases":["PYSEC-2026-3744","GHSA-2592-7m3g-7fq6"],"title":"openssl_encrypt versions before 1.4.0 contain an insecure default configuration that trusts the entire RFC 1918 private address space in …","summary":"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 hea…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","vendor":"openssl-encrypt","product":"openssl-encrypt","ecosystem":"pip","affected":["openssl-encrypt < 1.4.0"],"patched":["openssl-encrypt 1.4.0"],"published":"2026-08-17","updated":"2026-09-01","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/PYSEC-2026-3744","references":[{"url":"https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-2592-7m3g-7fq6"},{"url":"https://www.vulncheck.com/advisories/openssl-encrypt-before-insecure-default-configuration"}],"tags":["osv","pip"],"epss":0.00126,"epssPercentile":0.02617,"ingestedAt":"2026-09-02T19:31:24.709Z","slug":"CVE-2026-74882","body":"## Overview\n\nopenssl_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.\n\n## Affected packages\n\n- `openssl-encrypt < 1.4.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `openssl-encrypt 1.4.0`","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}