# CVE-2026-40614

> Vulnerability · severity: **HIGH** (CVSS 8.8).

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-40614
- **Published:** 2026-04-21
- **CVSS severity:** HIGH
- **CVSS base score:** 8.8
- **CWE codes:** CWE-122

## Affected products

- `pjsip:pjsip`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40614

## Citation

> AI Analytics. CVE-2026-40614. Retrieved 2026-07-30 from https://api.ai-analytics.org/cve/CVE-2026-40614. Derived from NIST NVD. Licensed CC0.

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