CVE-2026-40614Network attack vector

Memory corruption via undersized Opus FEC buffers

Published Apr 21, 2026 · Updated Apr 21, 2026

Heap buffer overflow in PJPROJECT 2.16 and earlier allows remote attackers to corrupt memory via crafted incoming Opus audio packets. In pjmedia/src/pjmedia-codec/opus.c, codec_decode() copies input->size bytes into dec_frame[].buf, whose PCM-based allocation can be smaller than codec_parse() output. The path is reachable only when an application enables Opus for received audio; successful triggering can crash the process or corrupt its heap.

CVSS severity8.5
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in PJPROJECT 2.16 and earlier allows remote attackers to corrupt memory via crafted incoming Opus audio packets. In pjmedia/src/pjmedia-codec/opus.c, codec_decode() copies input->size bytes into dec_frame[].buf, whose PCM-based allocation can be smaller than codec_parse() output. The path is reachable only when an application enables Opus for received audio; successful triggering can crash the process or corrupt its heap.

The record

CVE
CVE-2026-40614
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PJSIP · PJPROJECTversion=<= 2.16

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.5GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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