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openssl_encrypt CVE-2026-81721

| EUVDEUVD-2026-67071 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-08-27 VulnCheck GHSA-9pph-4h37-568j
Denial Of Service Openssl Encrypt
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
7.5 HIGH

Network-reachable via crafted file submission requiring no privileges or user interaction; impact is pure availability loss via process crash with no scope change.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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:N/VI:N/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 - 17:26 vuln.today
CVE Published
Aug 27, 2026 - 14:51 cve.org
HIGH 8.7

DescriptionCVE.org

openssl_encrypt before 1.4.9 fails to validate KDF cost parameters in encrypted file metadata and keystore headers, allowing attackers to trigger unbounded memory allocation. Attackers can craft malicious encrypted files declaring arbitrarily large Argon2, scrypt, or balloon KDF parameters to exhaust system memory and crash the process without authentication.

AnalysisAI

Uncontrolled memory allocation in jahlives/openssl_encrypt before 1.4.9 enables remote, unauthenticated denial of service by processing crafted encrypted files with arbitrarily large Argon2, scrypt, or balloon KDF cost parameters. Any application that passes attacker-controlled encrypted files or keystore data to this library can be crashed without requiring credentials, as the library performs no upper-bound validation on memory-hard KDF parameters before allocating the specified memory. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify application endpoint accepting encrypted file input
Delivery
Craft encrypted file with extreme Argon2 or scrypt memory cost parameter
Exploit
Submit crafted file to endpoint (no authentication required)
Execution
Library parses KDF cost parameters without validation
Persist
Unbounded memory allocation exhausts host RAM
Impact
Process crashes, service unavailable
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Vulnerability AssessmentAI

Exploitation The application must invoke openssl_encrypt to process an attacker-supplied encrypted file or keystore - for example, a file upload endpoint, a decryption API, or a keystore import feature that accepts user-controlled encrypted content. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VA:H) accurately characterizes the risk profile: the attack is network-reachable, requires no authentication or user interaction, and reliably produces a process crash. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a crafted encrypted file to a public-facing file import or decryption endpoint of an application built on openssl_encrypt. The crafted file's metadata declares an Argon2 memory parameter of, say, 64 GB. …
Remediation Upgrade jahlives/openssl_encrypt to version 1.4.9 or later, which introduces validation of KDF cost parameters parsed from encrypted file metadata and keystore headers. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all applications and services using jahlives/openssl_encrypt by version, document which ones accept untrusted encrypted files or keystores, and escalate for risk prioritization. …

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CVE-2026-81721 vulnerability details – vuln.today
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