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openssl_encrypt EUVDEUVD-2026-67036

| CVE-2026-81680 CRITICAL
Improper Verification of Cryptographic Signature (CWE-347)
2026-08-27 VulnCheck GHSA-59ww-7vhf-hj2q
Jwt Attack Authentication Bypass 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
8.2 HIGH

Header is forgeable without keys (PR:N/AC:L), but the payload is not disclosed so C:N; integrity of the file is fully compromised (I:H) and loss of recovery paths yields limited availability impact (A:L).

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/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 - 17:46 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 authenticate recovery-slot presence in envelope-format encrypted files, allowing attackers to remove recovery slots without re-encrypting the payload. Attackers can modify the file header to delete recovery-slot fields and bypass authentication, silently removing recovery paths the owner deliberately added.

AnalysisAI

Cryptographic-integrity bypass in the openssl_encrypt file-encryption utility (jahlives) before 1.4.9 lets an attacker edit the header of an envelope-format encrypted file to delete recovery-slot fields without any key and without re-encrypting the payload. Because recovery-slot presence is never cryptographically verified (CWE-347), recovery paths that the owner deliberately added can be silently stripped and the tampering goes undetected. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain target envelope file
Delivery
Locate recovery-slot header fields
Exploit
Delete/forge fields (no key needed)
Execution
Rewrite file, tool accepts unauthenticated header
Impact
Owner's recovery path silently removed
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Vulnerability AssessmentAI

Exploitation The attacker must be able to obtain and write back a modified copy of an openssl_encrypt envelope-format file (version below 1.4.9) that actually contains one or more recovery slots - that is the concrete prerequisite. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals here are mixed and should be read carefully. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can read and rewrite a victim's envelope-format encrypted file (for example on shared storage, a backup share, or a file in transit) opens the header, deletes the recovery-slot fields, and saves the file back. The tool accepts the modified file as valid because the header is not authenticated, so the owner's deliberately added recovery key can no longer decrypt the payload and the change is invisible until recovery is attempted. …
Remediation Vendor-released patch: 1.4.9 - upgrade openssl_encrypt to 1.4.9 or later, which authenticates recovery-slot presence in the envelope header. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all systems using jahlives and assess operational dependence on recovery-slot functionality for critical data. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-67036 vulnerability details – vuln.today
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