CVE-2026-40614

/* * Conceptual PoC for CVE-2026-40614 * Demonstrating the buffer calculation mismatch. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #define MAX_ENCODED_PACKET_SIZE 1280 #define SAMPLE_RATE 8000 #define CHANNEL_CNT 1 // Vulnerable buffer size calculation logic from PJSIP size_t calculate_vulnerable_buf_size() { return (SAMPLE_RATE / 1000) * 60 * CHANNEL_CNT * 2; // Results in 960 bytes } void simulate_codec_decode(char* input_payload, size_t input_size) { size_t buf_size = calculate_vulnerable_buf_size(); char* dec_frame_buf = (char*)malloc(buf_size); printf("Allocated buffer size: %zu bytes\n", buf_size); printf("Input payload size: %zu bytes\n", input_size); if (input_size > buf_size) { printf("[!] EXPLOIT: Heap buffer overflow detected!\n"); // This mimics the vulnerable pj_memcpy behavior memcpy(dec_frame_buf, input_payload, input_size); } else { memcpy(dec_frame_buf, input_payload, input_size); } free(dec_frame_buf); } int main() { // Simulate a large Opus packet (1280 bytes) char malicious_payload[MAX_ENCODED_PACKET_SIZE]; memset(malicious_payload, 'A', sizeof(malicious_payload)); simulate_codec_decode(malicious_payload, sizeof(malicious_payload)); return 0; }

{"cve": {"id": "CVE-2026-40614", "sourceIdentifier": "[email protected]", "published": "2026-04-21T19:16:17.880", "lastModified": "2026-04-23T16:09:54.393", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, there is a buffer overflow when decoding Opus audio frames due to insufficient buffer size validation in the Opus codec decode path. The FEC decode buffers (dec_frame[].buf) were allocated based on a PCM-derived formula: (sample_rate/1000) * 60 * channel_cnt * 2. At 8 kHz mono this yields only 960 bytes, but codec_parse() can output encoded frames up to MAX_ENCODED_PACKET_SIZE (1280) bytes via opus_repacketizer_out_range(). The three pj_memcpy() calls in codec_decode() copied input->size bytes without bounds checking, causing a heap buffer overflow."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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": 8.5, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "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:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-122"}]}], "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/17897e835818f8ee03b1806ddcd7b95ea16d2c0e", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/pjsip/pjproject/security/advisories/GHSA-j59p-4xrr-fp8g", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}