CVE-2026-26203— PJSIP's pjmedia-video has use-after-free in H264 packetizer when packetizing fragmented NAL
Quick assessment
Affected
pjsip pjmedia-video
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
PJSIP是pjsip开源的一个免费和开源的多媒体通信库，用C语言编写，实现基于标准的协议，如SIP, SDP, RTP, STUN, TURN，和ICE。 PJSIP 2.17之前版本存在资源管理错误漏洞，该漏洞源于H.264分组器在处理畸形H.264比特流时存在堆缓冲区下溢，可能导致从分配缓冲区之前的内存读取数据。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-26203
Vulnerability Information
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Vulnerability Title
PJSIP's pjmedia-video has use-after-free in H264 packetizer when packetizing fragmented NAL
Source: CVE Program / CVE List V5
Vulnerability Description
PJSIP is a free and open source multimedia communication library. Versions prior to 2.17 have a critical heap buffer underflow vulnerability in PJSIP's H.264 packetizer. The bug occurs when processing malformed H.264 bitstreams without NAL unit start codes, where the packetizer performs unchecked pointer arithmetic that can read from memory located before the allocated buffer. Version 2.17 contains a patch for the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
PJSIP 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PJSIP是pjsip开源的一个免费和开源的多媒体通信库，用C语言编写，实现基于标准的协议，如SIP, SDP, RTP, STUN, TURN，和ICE。 PJSIP 2.17之前版本存在资源管理错误漏洞，该漏洞源于H.264分组器在处理畸形H.264比特流时存在堆缓冲区下溢，可能导致从分配缓冲区之前的内存读取数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| pjsip | pjmedia-video | < 2.17 | - |
|
II. Public POCs for CVE-2026-26203
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Same weakness: CWE-416
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V. Comments for CVE-2026-26203
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