CVE-2026-74882openssl_encrypt before 1.4.0 Insecure Default Configuration

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.

8.7 HIGHEPSS 0.16%Not in KEVNVD: Analyzed

Last updated: 2026-10-01 15:20 UTC

OverviewCVSS details

8.7HIGHCVSS 4.0

Score source: VulnCheck (CNA)
NVD status: Analyzed
Published: Aug 17, 2026
Assigner: VulnCheck

Affected

openssl_encrypt (jahlives)

Versions: before 1.4.0
Fixed in: 1.4.0

Exploitation

Public exploit: None listed
CISA KEV: Not listed
KEV due date: —
SSVC: Exploitation none · Automatable yes · Impact partial

EPSS · FIRST, scored Nov 7

0.16%chance of exploitation in 30 days

Higher than 5.95% of CVEs

CVSS 4.0 · VulnCheck (CNA)

8.7High

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: None
User interaction: None
Confidentiality impact: High
Integrity impact: None
Availability impact: None
Confidentiality (other systems): None
Integrity (other systems): None
Availability (other systems): None

CVSS 3.1 · NVD

9.1Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: None

CVSS 3.1 · VulnCheck (CNA)

7.5High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: None

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
8.7	HIGH	4.0VulnCheck (CNA)	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
9.1	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.5	HIGH	3.1VulnCheck (CNA)	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CVE ID: CVE-2026-74882
Status: Analyzed
Assigner (CNA): VulnCheck
Published: Aug 17, 2026
Last modified: 2026-10-01 15:20 UTC
Weaknesses: CWE-345 · Insufficient Verification of Data Authenticity

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 11:18 UTC.