Bug 2460212 (CVE-2026-40614)

Summary: CVE-2026-40614 PJSIP: pjproject: PJSIP: Arbitrary code execution or denial of service via Opus audio frame decoding buffer overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: urgent    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in PJSIP, a multimedia communication library. A remote attacker could exploit a buffer overflow vulnerability when decoding Opus audio frames due to insufficient buffer size validation. This flaw allows for a heap buffer overflow, which may lead to arbitrary code execution or denial of service.
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Bug Depends On: 2460217, 2460218    
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Description OSIDB Bzimport 2026-04-21 19:01:46 UTC 
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.