CVE-2026-22705
📋 TL;DR
A timing side-channel vulnerability in RustCrypto's Signatures library allows attackers to potentially extract private key information during ML-DSA signing operations. This affects any application using RustCrypto Signatures for digital signatures prior to version 0.1.0-rc.2. The vulnerability could enable signature forgery or private key compromise.
💻 Affected Systems
- RustCrypto Signatures library
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete private key compromise leading to unauthorized data signing, authentication bypass, and impersonation attacks.
Likely Case
Partial key information leakage requiring sophisticated analysis, potentially enabling targeted attacks against high-value targets.
If Mitigated
Minimal impact with proper network segmentation and monitoring, though timing attacks remain difficult to fully mitigate.
🎯 Exploit Status
Timing side-channel attacks require precise measurements and controlled environments, making exploitation challenging but feasible for determined attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.1.0-rc.2 and later
Vendor Advisory: https://github.com/RustCrypto/signatures/security/advisories/GHSA-hcp2-x6j4-29j7
Restart Required: Yes
Instructions:
1. Update Cargo.toml to use 'signatures = "^0.1.0-rc.2"' 2. Run 'cargo update' 3. Rebuild and redeploy application 4. Restart affected services
🔧 Temporary Workarounds
Disable ML-DSA Signing
allTemporarily disable ML-DSA signature generation if alternative signing methods are available
Modify application code to use alternative signature algorithms
🧯 If You Can't Patch
- Implement network-level protections to obscure timing measurements
- Deploy affected systems in isolated environments with strict access controls
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock or Cargo.toml for signatures dependency version below 0.1.0-rc.2Check Version:
grep -A2 -B2 signatures Cargo.lockVerify Fix Applied:
Verify signatures version is 0.1.0-rc.2 or higher in Cargo.lock📡 Detection & Monitoring
Log Indicators:
- Unusual signing operation patterns
- Multiple failed signature validations
Network Indicators:
- Repeated timing measurements to signing endpoints
- Unusual network traffic patterns during signing operations
SIEM Query:
process:rust AND signature_operations > threshold