What’s Vulnerable › Vulnerabilities

CVE-2026-40614: PJSIP: Heap buffer overflow in Opus codec decoding

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-21 · updated 2026-10-26
• Weakness: CWE-122

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.

Affected products

• Pjsip: before 2.17 — fixed in 2.17

How to fix

Upgrade to a fixed version: Pjsip 2.17. Check the vendor advisory for mitigations.

References

• https://github.com/pjsip/pjproject/commit/17897e835818f8ee03b1806ddcd7b95ea16d2c0e
• https://github.com/pjsip/pjproject/security/advisories/GHSA-j59p-4xrr-fp8g

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