CVE-2026-40614 PJSIP: Heap buffer overflow in Opus codec decoding
A heap buffer overflow in PJSIP's Opus codec allows attackers to execute arbitrary code or cause denial of service via crafted audio frames.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-40614?
CVE-2026-40614 is a high-severity memory corruption vulnerability in pjsip pjproject, published on 21 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-122
Which versions are affected by CVE-2026-40614?
It affects 1 product.
Products include Pjsip Pjsip.
How do I fix CVE-2026-40614?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-40614 being exploited?
There is no known exploitation of CVE-2026-40614 in the wild and no public exploit code.
Other vulnerabilities in pjsip pjproject
- CVE-2026-28799 PJSIP: Heap use-after-free in PJSIP presence subscription termination handler
- CVE-2026-29068 PJSIP: Stack buffer overflow in Opus codec parser
- CVE-2026-32945 PJSIP is vulnerable to Heap-based Buffer Overflow through DNS parser
- CVE-2026-40892 PJSIP: Stack buffer overflow in pjsip_auth_create_digest2()
- CVE-2026-26967 PJSIP has a Heap-based Buffer Overflow vulnerability in its H.264 unpacketizer
Sources
Also known as ALPINE-CVE-2026-40614, DEBIAN-CVE-2026-40614, GHSA-j59p-4xrr-fp8g, UBUNTU-CVE-2026-40614.