PYSEC-2026-3744

vendorUSosv

view advisory published 2026-08-17Licence: CC-BY-4.0

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-74882US	critical9.1OT elevated	0.17% (6th)	—	2026-08-17
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. Attac…

references

External citations — patches, advisories, analysis.

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-2592-7m3g-7fq6ADVISORY
https://www.vulncheck.com/advisories/openssl-encrypt-before-insecure-default-configurationADVISORY

scry

Advisories like this name the exposed products attackers go after on your perimeter. See what is exposed on your perimeter with a free passive scan.

Free scan