Q: Is it fixed officially? (Patch/Mitigation)

✅ **Fixed?**: **YES**. 🔧 **Patch**: Upgrade to **v11.1.1** or later. 🔗 **Commit**: See GitHub commit `ee4b013` for the fix details.

Q: What if no patch? (Workaround)

🚧 **No Patch?**: **Impossible to workaround**. 🚫 **Reason**: The flaw is in the core RNG logic. 🛑 **Action**: You **MUST** upgrade. Do not use this library in its vulnerable state for any security-sensitive task.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. 📉 **CVSS**: High (C:H, I:H). ⏳ **Priority**: **Immediate**. Private keys are irreplaceable. Patch NOW to prevent catastrophic data breaches.

Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **Essence**: A critical flaw in `jsrsasign` (v7.0.0–11.1.1).
💥 **Consequences**: Incomplete comparison in random number generation leads to **Private Key Leakage**. Total compromise of cryptographic security!

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛡️ **CWE**: CWE-1023 (Comparison of Incomplete Structures).
🔍 **Flaw**: Functions `getRandomBigIntegerZeroToMax` and `getRandomBigIntegerMinToMax` in `src/crypto-1.1.js` fail to fully compare values, creating a bias.

Question 3

Who is affected? (Versions/Components)

Accepted Answer

📦 **Product**: jsrsasign (by Kenji Urushima).
📅 **Affected**: Versions **7.0.0 up to (but not including) 11.1.1**.
⚠️ **Note**: If you use these versions, you are vulnerable!

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

🕵️ **Attacker Action**: Exploit the RNG bias to predict random numbers.
🔑 **Result**: Recover the **Private Key**.
📉 **Impact**: High Confidentiality & Integrity loss (CVSS C:H, I:H).

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

🔓 **Threshold**: **LOW**.
🌐 **Vector**: Network (AV:N).
🚫 **Auth**: None required (PR:N).
👤 **UI**: None required (UI:N).
💡 **Verdict**: Easy to exploit remotely without interaction!

Question 6

Is there a public Exp? (PoC/Wild Exploitation)

Accepted Answer

📜 **Public Exp?**: No specific PoC code provided in data.
🔗 **References**: Snyk, GitHub PR #647, and Gist by Kr0emer exist.
⚠️ **Risk**: Theoretical exploitation is straightforward given the math flaw.

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Check**: Scan your `package.json` or dependencies for `jsrsasign`.
📊 **Version**: Verify if version < 11.1.1.
🛠️ **Tool**: Use Snyk or npm audit to detect this specific CVE.

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

✅ **Fixed?**: **YES**.
🔧 **Patch**: Upgrade to **v11.1.1** or later.
🔗 **Commit**: See GitHub commit `ee4b013` for the fix details.

Question 9

What if no patch? (Workaround)

Accepted Answer

🚧 **No Patch?**: **Impossible to workaround**.
🚫 **Reason**: The flaw is in the core RNG logic.
🛑 **Action**: You **MUST** upgrade. Do not use this library in its vulnerable state for any security-sensitive task.

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🔥 **Urgency**: **CRITICAL**.
📉 **CVSS**: High (C:H, I:H).
⏳ **Priority**: **Immediate**. Private keys are irreplaceable. Patch NOW to prevent catastrophic data breaches.

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CVE-2026-4599 — AI Deep Analysis Summary

Q1What is this vulnerability? (Essence + Consequences)

Q2Root Cause? (CWE/Flaw)

Q3Who is affected? (Versions/Components)

Q4What can hackers do? (Privileges/Data)

Q5Is exploitation threshold high? (Auth/Config)

Q6Is there a public Exp? (PoC/Wild Exploitation)

Q7How to self-check? (Features/Scanning)

Q8Is it fixed officially? (Patch/Mitigation)

Q9What if no patch? (Workaround)

Q10Is it urgent? (Priority Suggestion)

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