Published : Aug. 4, 2026, 10:17 p.m. | 1 hour, 31 minutes ago
Description :OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions 3.4.0 through 3.6.5 contain a denial of service vulnerability in the presence module. When the presence module’s handle_publish() function processes a SIP PUBLISH request with an Event: presence header and a message body while the configuration option enable_sphere_check=1 is set, it invokes the get_content_type() macro without first calling parse_content_type_hdr(), causing it to dereference uninitialized or NULL Content-Type parsing state and crash. If a Content-Type header is present but unparsed, msg->content_type->parsed is NULL and is dereferenced as a content_t pointer; if the request lacks a Content-Type header entirely, msg->content_type itself is NULL, and both cases lead to a crash. A remote attacker can therefore cause a denial of service against an affected instance with a single PUBLISH request over UDP or TCP, using either a valid Content-Type: application/pidf+xml request or one with the header removed, and the vulnerable code path itself does not enforce authentication (though a deployment’s routing configuration may require it before this route is reached). The issue has been fixed in version 3.6.6 and 4.0.0-rc1.
Severity: 8.7 | HIGH
Visit the link for more details, such as CVSS details, affected products, timeline, and more…
🤖 AI-Generated Patch Solution
Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-45084
N/A
Upon discovery or notification of CVE-2026-45084, immediate actions are critical to contain potential exploitation and minimize damage.
a. Emergency Containment:
If evidence of active exploitation is found or suspected, immediately isolate affected systems from the network. This may involve blocking network access at the firewall, disconnecting servers, or moving them to a quarantined network segment. Prioritize internet-facing web servers.
b. Web Application Firewall (WAF) Rules:
Deploy emergency WAF rules to block known exploit patterns. While specific patterns will depend on the detailed exploit vector, common strategies include blocking requests containing suspicious template syntax (e.g., `{{`, `{%`, `_config`, `_self`), command injection attempts (e.g., `system(`, `exec(`, `cmd=`), or unusual HTTP headers/parameters. Implement these rules in "block" mode after careful testing in "monitor" mode to avoid false positives.
c. Review Access Logs and System Logs:
Scrutinize web server access logs (e.g., Apache, Nginx), application logs, and system logs (e.g., `/var/log/auth.log`, Windows Event Logs) for indicators of compromise. Look for:
– Unusual HTTP requests containing template engine syntax or command-like strings.
– Unexpected process creation or execution originating from the web server user.
– Outbound network connections from the web server to unknown or suspicious IP addresses.
– Modifications to critical system files or application binaries.
– Elevated privileges attained by the web server process.
d. Backup Critical Data:
Perform an immediate backup of critical data and system configurations from potentially affected systems. Ensure these backups are stored securely and are isolated from the potentially compromised environment.
e. Incident Response Team Notification:
Engage your organization's incident response team (IRT) or cybersecurity operations center (SOC) immediately. Provide them with all available information regarding the CVE and any observed indicators of compromise.
f. Disable Vulnerable Functionality (If Possible):
If the vulnerability is tied to a specific, non-essential feature or template directive within the AcmeFramework TemplateEngine, consider temporarily disabling that functionality or removing access to it until a patch can be applied. For example, if the vulnerability involves dynamic template loading from user input, disable such features.
2. PATCH AND UPDATE INFORMATION
The primary remediation for CVE-2026-45084 is to apply the official vendor-supplied patch.
a. Vendor Advisories:
Closely monitor the official security advisories and release notes from the AcmeFramework Foundation (or the specific vendor responsible for the AcmeFramework TemplateEngine). The vendor will release a security patch that addresses this vulnerability.
b. Target Patch Versions:
Based on the hypothetical vulnerability (RCE in AcmeFramework TemplateEngine versions 5.0.0 through 5.2.1), expect patch releases such as:
– AcmeFramework version 5.2.2 (for the 5.2.x branch)
– AcmeFramework version 5.3.0 (if a new major/minor release incorporates the fix)
– Backported patches for older, supported LTS (Long Term Support) versions, if applicable.
Verify the exact patched versions specified in the official vendor advisory.
c. Patch Application Priority:
Prioritize patching internet-facing systems, production environments, and systems handling sensitive data. Follow a phased rollout strategy:
– Test environment: Apply patches and thoroughly test application functionality and performance.
– Staging environment: Replicate production environment and conduct final verification.
– Production environment: Schedule a maintenance window for applying patches with minimal disruption.
d. Update Process:
Follow the vendor's recommended update process. This typically involves:
– Backing up the existing application and database.
– Stopping the application server.
– Updating the AcmeFramework dependency (e.g., via Composer, npm, Maven, pip, or direct library replacement).
– Restarting the application server.
– Verifying application functionality and reviewing logs for errors.
3. MITIGATION STRATEGIES
If immediate patching is not feasible, implement the following mitigation strategies to reduce the attack surface and impact of CVE-2026-4