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openssl_encrypt CVE-2026-81696

| EUVDEUVD-2026-67052 CRITICAL
Improper Output Neutralization for Logs (CWE-117)
2026-08-27 VulnCheck GHSA-mww3-xh7q-jwwm
Information Disclosure Openssl Encrypt
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.5 MEDIUM

File is delivered remotely (AV:N) but the victim must run 'info' on it (UI:R); impact is output forgery/spoofing, so integrity is high while confidentiality and availability are not affected.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 27, 2026 - 18:02 EUVD
Analysis Generated
Aug 27, 2026 - 17:36 vuln.today
CVE Published
Aug 27, 2026 - 14:50 cve.org
CRITICAL 9.3

DescriptionCVE.org

openssl_encrypt versions before 1.4.9 fail to sanitize terminal control characters in file metadata printed by the info command. Attackers can craft malicious files containing escape sequences to repaint terminal output and forge verification information displayed to users.

AnalysisAI

Terminal escape-sequence injection in jahlives openssl_encrypt before 1.4.9 lets an attacker embed control characters in a file's metadata that are emitted verbatim when a victim runs the tool's 'info' command, letting the attacker repaint the terminal and forge the integrity/verification output the tool displays. The practical impact is spoofing: a tampered or malicious file can be made to appear verified or trustworthy to the operator. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft file with escape sequences in metadata
Delivery
Deliver malicious file to victim
Exploit
Victim runs 'info' command
Execution
Terminal interprets control characters
Persist
Forged verification output displayed
Impact
Victim trusts tampered file
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Vulnerability AssessmentAI

Exploitation Requires the victim to run the 'info' command of openssl_encrypt (versions before 1.4.9) against an attacker-crafted file whose metadata contains terminal control/escape sequences, and requires a terminal emulator that interprets those sequences. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The published CVSS 4.0 score of 9.3 (VC:H/VI:H/VA:H, PR:N, UI:N) substantially overstates real-world risk for this bug class. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a file whose metadata field contains ANSI escape sequences and delivers it to a victim (e.g., as a supposedly encrypted deliverable). When the victim inspects it with 'openssl_encrypt info malicious.file', the escape sequences reposition the cursor and overwrite the output to display a forged 'signature valid / integrity verified' message, causing the victim to trust a tampered file. …
Remediation Vendor-released patch: upgrade to openssl_encrypt 1.4.9 or later, which sanitizes terminal control characters in metadata output, per GHSA-539p-fxf4-7fv8. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all systems running jahlives openssl_encrypt prior to version 1.4.9 and alert teams managing file verification workflows. …

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CVE-2026-81696 vulnerability details – vuln.today
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