CVE-2026-26203— PJSIP's pjmedia-video has use-after-free in H264 packetizer when packetizing fragmented NAL
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
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
Same vendor: pjsip
- CVE-2026-42225
GnuTLS backend silently skips certificate chain verification - CVE-2026-41416
PJSIP: Asymmetric ptime integer overflow in Media Stream - CVE-2026-41415
PJSIP: SIP Multipart CID URI Length Underflow - CVE-2026-40892
PJSIP: Stack buffer overflow in pjsip_auth_create_digest2() - CVE-2026-40614
PJSIP: Heap buffer overflow in Opus codec decoding
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