CVE-2026-81687— 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.
在 1.4.9 之前版本的 openssl_encrypt 未能对文件元数据中指定的密钥派生函数（KDF）迭代次数设定时间上限。攻击者可以构造具有极高 KDF 迭代次数的文件，从而在密码验证发生前长时间甚至无限制地消耗 CPU 资源。
Possible ATT&CK Techniques 1 AI
T1027 · Obfuscated Files or Information
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I. Basic Information for CVE-2026-81687
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 versions before 1.4.9 fail to enforce a time ceiling on key derivation function iteration counts specified in file metadata. Attackers can craft files with extremely high KDF iteration counts to consume CPU resources for unbounded periods before password verification occurs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| jahlives | openssl_encrypt | 0 ~ 1.4.9 | - |
|
II. Public POCs for CVE-2026-81687
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-81687 (2)
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🔗 openssl_encrypt before 1.4.9 Denial of Service via KDF | Advisories | VulnCheck third-party-advisory
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-2026-81702 | 9.8 CRITICAL | openssl_encrypt before 1.4.9 Key Substitution via Identity Load |
| CVE-2026-81700 | 9.8 CRITICAL | openssl_encrypt before 1.4.9 GPG Signature Verification Bypass |
| CVE-2026-81701 | 9.8 CRITICAL | openssl_encrypt before 1.4.9 Arbitrary Code Execution via unsigned plugin |
| 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-2026-81688 | 7.5 HIGH | openssl_encrypt before 1.4.9 Plaintext Confirmation Oracle via SHA-256 |
| CVE-2026-81704 | 7.5 HIGH | openssl_encrypt before 1.4.9 Weak Key Derivation via D-Bus |
| CVE-2026-81691 | 7.5 HIGH | openssl_encrypt before 1.4.9 Credential Leakage via Unvalidated Server URLs |
| CVE-2026-81721 | 7.5 HIGH | openssl_encrypt before 1.4.9 Denial of Service via KDF |
| 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-2026-81705 | 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-2026-81718 | 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 |
Showing top 20 of 36 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: openssl_encrypt
-
CVE-2026-81721
openssl_encrypt before 1.4.9 Denial of Service via KDF -
CVE-2026-81719
openssl_encrypt before 1.4.9 Remote Code Execution via Plugi -
CVE-2026-81720
openssl_encrypt before 1.4.9 Denial of Service via Unbounded -
CVE-2026-81718
openssl_encrypt before 1.4.9 Weak Cryptographic Parameters -
CVE-2026-81717
openssl_encrypt before 1.4.9 Integrity Bypass via Added File
Same vendor: jahlives
-
CVE-2026-81721
openssl_encrypt before 1.4.9 Denial of Service via KDF -
CVE-2026-81719
openssl_encrypt before 1.4.9 Remote Code Execution via Plugi -
CVE-2026-81720
openssl_encrypt before 1.4.9 Denial of Service via Unbounded -
CVE-2026-81718
openssl_encrypt before 1.4.9 Weak Cryptographic Parameters -
CVE-2026-81717
openssl_encrypt before 1.4.9 Integrity Bypass via Added File
Same weakness: CWE-400
-
CVE-2026-81725
NLTK before 3.10.3 Regular Expression Denial of Service via -
CVE-2026-81723
NLTK before 3.10.3 Quadratic CPU Exhaustion via XMLCorpusVie -
CVE-2026-81721
openssl_encrypt before 1.4.9 Denial of Service via KDF -
CVE-2026-81720
openssl_encrypt before 1.4.9 Denial of Service via Unbounded -
CVE-2026-62326
Weblate Has Uncontrolled Resource Consumption via
V. Comments for CVE-2026-81687
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