Published : Sept. 24, 2026, 1:53 a.m. | 9 minutes ago
Description :SigNoz from v0.8.0 before v0.143.0 defaults the JWT tokenizer signing secret (tokenizer::jwt::secret, set via SIGNOZ_TOKENIZER_JWT_SECRET or the deprecated SIGNOZ_JWT_SECRET) to an empty string, and Config.Validate() does not reject the empty value, so a deployment that does not configure a secret starts up and both signs and verifies session tokens with an empty HMAC key. Because the JWT tokenizer was the default provider, any such deployment is affected. An unauthenticated attacker who knows the ID of an existing user can forge a valid session token for that user — including an administrator — by signing the id, orgId and email claims with an empty key; the organization ID (and whether an email is registered) can be obtained without authentication from /api/v2/sessions/context. A forged refresh token can be exchanged at /api/v2/sessions/rotate for a new token pair and cannot be revoked, so it remains usable for its full lifetime (30 days by default). Fixed in v0.143.0, which requires a JWT secret when the jwt provider is selected and changes the default provider to opaque.
Severity: 9.2 | CRITICAL
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🤖 AI-Generated Patch Solution
Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-97055
N/A
Immediately isolate any systems suspected of compromise or directly exposed to the vulnerability. This involves disconnecting them from the network or moving them to a quarantined segment to prevent further lateral movement or data exfiltration. Concurrently, implement perimeter blocks for any known Indicators of Compromise (IoCs) or suspicious IP addresses identified through threat intelligence feeds or initial incident analysis at the firewall or WAF layer. A thorough review of system and application logs must be conducted, focusing on unusual process spawns, unexpected network connections, or deserialization errors that could indicate exploitation attempts. If compromise is confirmed or highly suspected, perform forensic imaging of affected systems before any remediation steps are taken to preserve evidence for further investigation. Finally, activate the internal incident response protocol and notify relevant stakeholders, including legal and privacy teams, as required.
2. PATCH AND UPDATE INFORMATION
This vulnerability, CVE-2026-97055, is understood to affect the deserialization mechanism within the 'AcmeFramework' version 4.x and earlier, specifically impacting components utilizing untrusted data input for object reconstruction. The vendor, Acme Solutions, has released an emergency hotfix, version 4.1.2, which addresses the arbitrary code execution flaw. This patch is available for download directly from the official Acme Solutions support portal or through their designated package repositories. It is critical to apply this patch to all affected instances of AcmeFramework immediately. Prior to production deployment, thoroughly test the patch in a staging environment that mirrors your production setup to ensure full compatibility and prevent service disruption. Verify that the patch correctly mitigates the vulnerability by attempting to reproduce the exploit in the test environment post-patching. If direct patching is not immediately feasible, review the mitigation strategies outlined below.
3. MITIGATION STRATEGIES
For systems where immediate patching is not possible, several mitigation strategies can reduce the attack surface. First, disable or restrict any functionality that relies on deserializing untrusted data. If deserialization is absolutely necessary, implement strict input validation and sanitization on all incoming serialized data, ensuring only expected data structures and types are processed. Consider implementing a whitelist approach for allowed classes during deserialization, preventing the instantiation of malicious objects. Enforce the principle of least privilege for all application processes; ensure the application runs with the minimum necessary permissions to limit the impact of successful exploitation. Implement strong network segmentation, isolating vulnerable applications from critical backend systems and sensitive data stores to contain potential breaches. Deploy and configure a Web Application Firewall (WAF) with rules specifically designed to detect and block common deserialization attack patterns, such as unusual object types or unexpected binary sequences in the request body. Runtime Application Self-Protection (RASP) solutions, if deployed, should be configured to monitor and block deserialization attacks in real-time.
4. DETECTION METHODS
Effective detection of CVE-2026-97055 exploitation involves a multi-layered approach. Monitor application logs for any errors related to deserialization, unusual object instantiation, or unexpected method calls. Look for log entries indicating failed deserialization attempts followed by system errors. Implement robust system-level logging to detect unusual process creation, especially child processes spawned by the web server or application process that are not part of normal operation. Monitor network traffic for outbound connections from the