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CVE-2026-57165— PJSIP: Pre-authentication overflow in the telnet CLI history

Quick assessment

Affected
pjsip pjproject
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 是一个用 C 语言编写的免费开源多媒体通信库。在提交 628b716 之前，PJLIB-UTIL 中的 Telnet CLI 前端在重绘命令行以召回历史记录时（位于 cli_telnet.c 中的 handle_up_down() 函数）存在一个栈缓冲区溢出漏洞。该漏洞仅影响启用了 Telnet CLI 前端的应用程序（与相关的 CLI 问题采用相同的启用条件）。在重绘被召回的历史记录条目时，生成的重绘序列可能累积超过固定大小栈缓冲区容量的数据，这可能导致应用程序终止。利用该漏洞需要对未认证的 Teln

CVSS 6.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
pjsip pjproject < 628b71638465bacf66e767959e6acbab822eccd6 affected
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I. Basic Information for CVE-2026-57165

Vulnerability Information
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Vulnerability Title
PJSIP: Pre-authentication overflow in the telnet CLI history
Source: CVE Program / CVE List V5
Vulnerability Description
PJSIP is a free and open source multimedia communication library written in C. Prior to commit 628b716, a stack buffer overflow exists in the PJLIB-UTIL telnet CLI front-end when redrawing the command line during history recall (handle_up_down() in cli_telnet.c). This affects only applications that enable the telnet CLI front-end (same gating as the related CLI issue). The line-redraw sequence for a recalled history entry can accumulate more data than a fixed-size stack buffer holds, which may lead to application termination. Exploitation requires access to the unauthenticated telnet CLI, which already permits arbitrary CLI commands, so the additional impact is limited. Applications that do not enable the telnet CLI front-end are not affected. This issue has been patched via commit 628b716.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pjsip pjproject < 628b71638465bacf66e767959e6acbab822eccd6 -

II. Public POCs for CVE-2026-57165

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III. Intelligence Information for CVE-2026-57165

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Patches & Fixes for CVE-2026-57165 (1)

Vendor Advisories for CVE-2026-57165 (1)

Same Patch Batch · pjsip · 2026-09-04 · 8 CVEs total

CVE-2026-57163 8.8 HIGH PJSIP: Stack overflow parsing a TLS peer certificate's SubjectAltName in GnuTLS backend
CVE-2026-57162 8.8 HIGH PJSIP: Stack overflow parsing SDP a=crypto attributes
CVE-2026-57161 8.8 HIGH PJSIP: Stack overflow handling Service-Route headers in a registration response
CVE-2026-57159 8.4 HIGH PJSIP: SDP parser out-of-bounds write in remote payload-type map maintenance
CVE-2026-57164 8.3 HIGH PJSIP: Heap overflow in the HTTP client
CVE-2026-57160 6.9 MEDIUM PJSIP: SIP message header buffer overflow
CVE-2026-57166 6.3 MEDIUM PJSIP: Pre-authentication overflow in the telnet CLI error

IV. Related Vulnerabilities

Same product: pjproject
Same vendor: pjsip
Same weakness: CWE-121

V. Comments for CVE-2026-57165

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