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openssl_encrypt CVE-2026-81693

| EUVDEUVD-2026-67049 HIGH
Memory Allocation with Excessive Size Value (CWE-789)
2026-08-27 VulnCheck GHSA-m9c9-3x53-3cf8
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-accessible QR ingestion with no auth or interaction required; impact is availability-only 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 - 17:38 vuln.today
CVE Published
Aug 27, 2026 - 14:50 cve.org
HIGH 8.7

DescriptionCVE.org

openssl_encrypt before 1.4.9 fails to validate the total field from QR JSON payloads before materializing ranges. Attackers can supply crafted QR images with extremely large total values to trigger unbounded memory allocation and cause denial of service through out-of-memory conditions.

AnalysisAI

Uncontrolled memory allocation in the jahlives openssl_encrypt PHP library (versions before 1.4.9) exposes any application processing QR codes to remote denial of service. The library fails to validate the 'total' field within QR JSON payloads before allocating memory for range materialization, allowing an unauthenticated attacker to supply a crafted QR image containing an arbitrarily large 'total' value and exhaust host memory. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft QR image with oversized total field
Delivery
Submit QR to exposed endpoint
Exploit
Library parses JSON payload without validation
Execution
Unbounded memory allocation triggered
Persist
Host memory exhausted
Impact
Application process crashes with OOM
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Vulnerability AssessmentAI

Exploitation No special conditions are required beyond the ability to submit a QR image to an application using the affected openssl_encrypt library (before version 1.4.9). … 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 reflects the low friction of exploitation: no authentication, no special conditions, and no user interaction are required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker targeting an internet-facing ticketing or logistics application that uses openssl_encrypt to validate QR codes submits a crafted QR image in which the embedded JSON payload contains an astronomically large 'total' value (e.g., 2^63). The library reads this value and attempts to allocate a corresponding memory range without validation, causing the PHP worker or host process to exhaust available RAM, crashing the service or triggering OOM-killer termination across co-hosted services. …
Remediation Upgrade to openssl_encrypt version 1.4.9, which is the vendor-confirmed patched release per the advisory at https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-r23m-gf2m-8www and the VulnCheck report at https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-denial-of-service-via-qr-total-field. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all production systems using the jahlives openssl_encrypt library and identify which services accept QR code input. …

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CVE-2026-81693 vulnerability details – vuln.today
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