CVE-2026-74882Network attack vector

mTLS bypass via overbroad trusted_proxies default

Published Aug 17, 2026 · Updated Aug 18, 2026

Authentication bypass in jahlives openssl_encrypt before 1.4.0 allows attackers to bypass mTLS via forged client-certificate headers. The IntegrityProxyConfig class in openssl_encrypt_server/config.py seeds trusted_proxies with 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16, so proxy-supplied certificate headers from any RFC 1918 host are treated as trusted input instead of being limited to localhost or explicitly configured proxies. Exploitation requires network reachability from a private address and weakened or modified ProxyAuth validation; the published impact is authentication bypass for certificate-gated requests, not code execution or service interruption.

CVSS severity8.7
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in jahlives openssl_encrypt before 1.4.0 allows attackers to bypass mTLS via forged client-certificate headers. The IntegrityProxyConfig class in openssl_encrypt_server/config.py seeds trusted_proxies with 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16, so proxy-supplied certificate headers from any RFC 1918 host are treated as trusted input instead of being limited to localhost or explicitly configured proxies. Exploitation requires network reachability from a private address and weakened or modified ProxyAuth validation; the published impact is authentication bypass for certificate-gated requests, not code execution or service interruption.

The record

CVE
CVE-2026-74882
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
jahlives
Product
OpenSSL Encrypt
Classifications
CWE-345, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

jahlives · OpenSSL Encryptversion=0 <1.4.0

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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