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CVE-2026-81721— openssl_encrypt before 1.4.9 Denial of Service via KDF

Quick assessment

Affected
jahlives openssl_encrypt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tobi OpenSSL Encrypt是Tobi个人开发者的一款基于 Python 的文件加密工具。 Tobi OpenSSL Encrypt 1.4.9之前版本存在资源管理错误漏洞，该漏洞源于未验证加密文件元数据和密钥库标头中的KDF成本参数，攻击者可构造恶意加密文件声明任意大的Argon2、scrypt或balloon KDF参数，导致系统内存耗尽并崩溃进程。

CVSS 7.5 · High EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1480 · Execution Guardrails

Affected Version Matrix 2

VendorProduct Version RangeStatus
jahlives openssl_encrypt < 1.4.9 affected
1.4.9 unaffected
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I. Basic Information for CVE-2026-81721

Vulnerability Information
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Vulnerability Title
openssl_encrypt before 1.4.9 Denial of Service via KDF
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Tobi OpenSSL Encrypt 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tobi OpenSSL Encrypt是Tobi个人开发者的一款基于 Python 的文件加密工具。 Tobi OpenSSL Encrypt 1.4.9之前版本存在资源管理错误漏洞，该漏洞源于未验证加密文件元数据和密钥库标头中的KDF成本参数，攻击者可构造恶意加密文件声明任意大的Argon2、scrypt或balloon KDF参数，导致系统内存耗尽并崩溃进程。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jahlives openssl_encrypt 0 ~ 1.4.9 -

II. Public POCs for CVE-2026-81721

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III. Intelligence Information for CVE-2026-81721

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Vendor Advisories for CVE-2026-81721 (2)

Same Patch Batch · jahlives · 2026-08-27 · 36 CVEs total

CVE-2026-81707 9.8 CRITICAL openssl_encrypt before 1.4.9 ANSI Escape Injection via Identity Email
CVE-2026-81701 9.8 CRITICAL openssl_encrypt before 1.4.9 Arbitrary Code Execution via unsigned plugin
CVE-2026-81700 9.8 CRITICAL openssl_encrypt before 1.4.9 GPG Signature Verification Bypass
CVE-2026-81702 9.8 CRITICAL openssl_encrypt before 1.4.9 Key Substitution via Identity Load
CVE-2026-81683 8.4 HIGH openssl_encrypt before 1.4.9 Plaintext Private Key Storage
CVE-2026-81719 7.8 HIGH openssl_encrypt before 1.4.9 Remote Code Execution via Plugin
CVE-2026-81704 7.5 HIGH openssl_encrypt before 1.4.9 Weak Key Derivation via D-Bus
CVE-2026-81698 7.5 HIGH openssl_encrypt before 1.4.9 Shell Injection via info command
CVE-2026-81693 7.5 HIGH openssl_encrypt before 1.4.9 Denial of Service via QR total field
CVE-2026-81691 7.5 HIGH openssl_encrypt before 1.4.9 Credential Leakage via Unvalidated Server URLs
CVE-2026-81705 7.5 HIGH openssl-encrypt before 1.4.9 Password Cleartext Leak via Debug
CVE-2026-81689 7.5 HIGH openssl_encrypt before 1.4.9 Weak Pepper Key Derivation
CVE-2026-81699 7.5 HIGH openssl_encrypt before 1.4.9 Denial of Service via unbounded KDF cost
CVE-2026-81692 7.5 HIGH openssl_encrypt before 1.4.9 Denial of Service via STREAMINFO
CVE-2026-81688 7.5 HIGH openssl_encrypt before 1.4.9 Plaintext Confirmation Oracle via SHA-256
CVE-2026-81718 7.5 HIGH openssl_encrypt before 1.4.9 Weak Cryptographic Parameters
CVE-2026-81690 7.3 HIGH verify-usb before 1.4.9 Symlink Directory Traversal Code Execution
CVE-2026-81714 7.0 HIGH openssl_encrypt before 1.4.9 Plugin Signing Trust Anchor Enrollment Bypass
CVE-2026-81706 6.8 MEDIUM openssl_encrypt before 1.4.9 Key Substitution via Identity Shadowing
CVE-2026-81684 6.2 MEDIUM openssl_encrypt before 1.4.9 Information Disclosure via Command Line

Showing top 20 of 36 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: openssl_encrypt
Same vendor: jahlives
Same weakness: CWE-400

V. Comments for CVE-2026-81721

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