CVE-2026-32942

/* * PoC for CVE-2026-32942: Race Condition in PJSIP ICE Session * This is a conceptual simulation to trigger the race condition. */ #include <pthread.h> #include <stdlib.h> // Simulated PJSIP structures typedef struct { int active; void* callback_data; } ice_session; ice_session* session; void* destroy_thread_func(void* arg) { // Simulate session destruction (freeing memory) free(session); session = NULL; return NULL; } void* callback_thread_func(void* arg) { // Simulate a callback happening after/during destruction // Introduce slight delay to increase race window usleep(100); if (session) { // Use-After-Free happens here if destroy_thread ran first printf("Callback data: %p\n", session->callback_data); } return NULL; } int main() { pthread_t t1, t2; session = (ice_session*)malloc(sizeof(ice_session)); session->active = 1; // Create threads to simulate race condition pthread_create(&t1, NULL, destroy_thread_func, NULL); pthread_create(&t2, NULL, callback_thread_func, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }

{"cve": {"id": "CVE-2026-32942", "sourceIdentifier": "[email protected]", "published": "2026-03-20T04:16:49.743", "lastModified": "2026-03-23T20:51:20.980", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "PJSIP is a free and open source multimedia communication library written in C. Versions 2.16 and below contain a heap use-after-free vulnerability in the ICE session that occurs when there are race conditions between session destruction and the callbacks. This issue has been fixed in version 2.17."}, {"lang": "es", "value": "PJSIP es una biblioteca de comunicación multimedia de código abierto y gratuita escrita en C. Las versiones 2.16 e inferiores contienen una vulnerabilidad de uso después de liberación en el heap en la sesión ICE que ocurre cuando hay condiciones de carrera entre la destrucción de la sesión y las devoluciones de llamada. Este problema ha sido solucionado en la versión 2.17."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.0, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "UNREPORTED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:pjsip:pjsip:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.17", "matchCriteriaId": "117AFEC4-36E1-424F-B2A3-6EC94FBBDF38"}]}]}], "references": [{"url": "https://github.com/pjsip/pjproject/commit/c9caceddabda7f18337b2a82d25d65f6224b450a", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/pjsip/pjproject/issues/1451", "source": "[email protected]", "tags": ["Issue Tracking"]}, {"url": "https://github.com/pjsip/pjproject/security/advisories/GHSA-g88q-c2hm-q7p7", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}