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openssl_encrypt CVE-2026-81707

| EUVDEUVD-2026-67063 CRITICAL
Improper Input Validation (CWE-20)
2026-08-27 VulnCheck GHSA-fhj3-wp77-vmvw
Authentication Bypass Microsoft 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

Remote unauthenticated delivery (AV:N/PR:N) but the victim must import and view the crafted identity (UI:R); impact is spoofing/verification bypass so I:H, with no direct confidentiality or availability loss.

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 - 17:30 vuln.today
CVE Published
Aug 27, 2026 - 14:51 cve.org
CRITICAL 9.3

DescriptionCVE.org

openssl_encrypt before 1.4.9 fails to sanitize the email field of imported identity documents, allowing attackers to inject ANSI escape sequences that forge the fingerprint verification line displayed to users. Attackers can deliver a crafted identity bundle through normal contact-exchange flows or keyserver responses to manipulate terminal output and display a fraudulent fingerprint, bypassing the out-of-band verification mechanism that protects against key substitution attacks.

AnalysisAI

Fingerprint-verification spoofing in jahlives openssl_encrypt before 1.4.9 lets attackers embed ANSI escape sequences in the email field of an imported identity document, rewriting the terminal line that displays a key fingerprint. A remote, unauthenticated attacker who delivers a crafted identity bundle via normal contact-exchange or keyserver flows can make the tool render a fraudulent fingerprint, defeating the out-of-band verification that guards against key-substitution (MITM) attacks. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft identity bundle with ANSI escapes in email
Delivery
Deliver via keyserver or contact exchange
Exploit
Victim imports malicious identity
Execution
Terminal renders forged fingerprint line
Persist
Victim trusts substituted key
Impact
Attacker performs key-substitution MITM
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target use openssl_encrypt's identity-import and fingerprint-verification workflow in a terminal that interprets ANSI/VT100 escape sequences (most standard terminal emulators). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The input CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N, VC:H/VI:H/VA:H, score 9.3) rates this as critical with full CIA impact, but that rating is questionable: the described flaw is a display-spoofing/verification-bypass primitive whose direct impact is integrity (a forged fingerprint), not confidentiality or availability of the host, and it realistically requires the victim to import and visually inspect a crafted identity - i.e. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts an identity bundle whose email field contains ANSI escape sequences and publishes it to a keyserver or hands it over during a normal contact exchange. When the victim imports it and runs the verification step, their terminal interprets the escapes and renders a fingerprint matching the attacker's substituted key; the victim confirms the 'match' and unknowingly trusts the wrong key. …
Remediation Vendor-released patch: upgrade to openssl_encrypt 1.4.9 or later, which sanitizes the email field of imported identity documents (see advisory GHSA-qjr2-x6mr-8xgf). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, disable key import and exchange features in all jahlives openssl_encrypt instances running versions before 1.4.9, or restrict access to isolated internal networks only; concurrently notify users that fingerprint verification through this tool cannot be trusted for external key exchanges. …

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CVE-2026-81707 vulnerability details – vuln.today
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