CVE-2025-58185
📋 TL;DR
This vulnerability in Go's DER parsing allows an attacker to cause memory exhaustion by sending maliciously crafted DER payloads. It affects applications using Go's crypto/x509 or encoding/asn1 packages to parse untrusted DER data. Systems processing external certificates or ASN.1 data are primarily at risk.
💻 Affected Systems
- Go programming language
- Applications using Go's crypto/x509 package
- Applications using Go's encoding/asn1 package
📦 What is this software?
Go by Golang
Go by Golang
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service through memory exhaustion, potentially crashing the application or causing system instability.
Likely Case
Application crashes or becomes unresponsive when processing malicious DER payloads, leading to service disruption.
If Mitigated
Limited impact with proper memory limits and input validation in place, though some performance degradation may occur.
🎯 Exploit Status
Exploitation requires sending malicious DER payloads to vulnerable applications. No authentication needed if application accepts external input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Go 1.23.4 and Go 1.24.1
Vendor Advisory: https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI
Restart Required: Yes
Instructions:
1. Update Go to version 1.23.4 or 1.24.1 using your package manager or official Go distribution. 2. Recompile all affected applications with the updated Go version. 3. Restart services using the patched applications.
🔧 Temporary Workarounds
Limit DER input size
allImplement size limits on DER payloads before parsing to prevent memory exhaustion.
// Go code example: if len(derData) > maxAllowedSize { return error }
Input validation
allValidate DER payloads come from trusted sources before parsing.
// Implement source validation before calling x509.ParseCertificate() or similar functions
🧯 If You Can't Patch
- Implement strict input size limits on all DER parsing operations
- Isolate DER parsing services in containers with memory limits
🔍 How to Verify
Check if Vulnerable:
Check Go version with 'go version'. If version is before 1.23.4 or 1.24.1 and application parses untrusted DER data, it's vulnerable.Check Version:
go versionVerify Fix Applied:
Verify Go version is 1.23.4 or 1.24.1 with 'go version' and confirm applications are recompiled with this version.📡 Detection & Monitoring
Log Indicators:
- Memory exhaustion errors
- Application crashes during certificate parsing
- High memory usage spikes during DER processing
Network Indicators:
- Large DER payloads sent to services
- Repeated DER parsing requests
SIEM Query:
source="application.logs" AND ("out of memory" OR "panic" OR "certificate parsing")