Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-11979— Stack-Based Buffer Overflow in libxml2

Quick assessment

Affected
xmlsoft libxml2
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.

GNOME libxml2是GNOME基金会开源的一个用来解析XML文档的函数库。它用C语言写成,并且能为多种语言所调用,例如C语言,C++,XSH。 GNOME libxml2 2.15.3及之前版本存在缓冲区错误漏洞，该漏洞源于xmlcatalog utility在--shell模式下usershell()函数使用固定大小的栈缓冲区处理用户输入时未进行适当的边界检查，通过提供过长的输入行，攻击者可以在输入解析期间溢出内部缓冲区（command、arg和argv），导致栈帧内存损坏，成功利用可能导致崩溃

AI Predicted 7.8 Difficulty: Easy EPSS 0.15% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
xmlsoft libxml2 ≤ 2.15.3 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-11979

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Stack-Based Buffer Overflow in libxml2
Source: CVE Program / CVE List V5
Vulnerability Description
libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --shell mode. The usershell() function processes user input using fixed-size stack buffers without proper bounds checking. By supplying an overly long input line, an attacker can overflow internal buffers (command, arg, and argv) during input parsing. This results in memory corruption within the stack frame. Successful exploitation may cause a crash or potentially allow arbitrary code execution in the context of the xmlcatalog process. This issue has been fixed in the commit c2e233fc. NOTE: The maintainers of this project did not agree that this issue is a vulnerability and considered it a bug.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
GNOME libxml2 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNOME libxml2是GNOME基金会开源的一个用来解析XML文档的函数库。它用C语言写成,并且能为多种语言所调用,例如C语言,C++,XSH。 GNOME libxml2 2.15.3及之前版本存在缓冲区错误漏洞，该漏洞源于xmlcatalog utility在--shell模式下usershell()函数使用固定大小的栈缓冲区处理用户输入时未进行适当的边界检查，通过提供过长的输入行，攻击者可以在输入解析期间溢出内部缓冲区（command、arg和argv），导致栈帧内存损坏，成功利用可能导致崩溃
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
xmlsoft libxml2 0 ~ 2.15.3 -

II. Public POCs for CVE-2026-11979

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-11979

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-11979 (1)

Security Blog Posts for CVE-2026-11979 (1)

IV. Related Vulnerabilities

Same product: libxml2
Same vendor: xmlsoft
Same weakness: CWE-121

V. Comments for CVE-2026-11979

No comments yet

Leave a comment