pjsip pjproject up to 2.16 codec_parse dec_frame[].buf heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in pjsip pjproject up to 2.16. Affected is the function codec_parse. This manipulation of the argument dec_frame[].buf causes heap-based overflow. This vulnerability is registered as CVE-2026-40614. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability has been found in pjsip pjproject up to 2.16 and classified as critical. Affected by this vulnerability is the function codec_parse. The manipulation of the argument dec_frame[].buf with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-40614 since 04/14/2026. The exploitation appears to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 321215 (Debian dla-4631 : asterisk - security update), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (321215). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Project Management Software

Vendor

• pjsip

Name

• pjproject

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16

License

• open-source

Website

• Product: https://github.com/pjsip/pjproject/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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