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

Goal: 1000 CNY · Raised: 1359 CNY

100%

Buy Us a Coffee

CVE-2026-115501— IBM i is Affected By A Buffer Overflow Vulnerability in QFileSvr.400 File System []

Quick assessment

Affected

IBM i

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.

IBM i 7.3、7.4、7.5 和 7.6 版本存在栈缓冲区溢出漏洞，原因是 QFileSvr.400 文件系统中的边界检查不当。通过向 QFileSvr.400 文件系统发送特定命令，经过身份验证的本地攻击者可导致未定义行为。

CVSS 5.3 · Medium EPSS 0.12% · P2 Updated Nov 15, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1203 · Exploitation for Client Execution

Affected Version Matrix 4

Vendor	Product	Version Range	Status
IBM	i	`7.6`	affected
		`7.5`	affected
		`7.4`	affected
		`7.3`	affected

Get alerts for future matching vulnerabilities Log in to subscribe

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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

IBM i is Affected By A Buffer Overflow Vulnerability in QFileSvr.400 File System []

Source: CVE Program / CVE List V5

Vulnerability Description

IBM i 7.3 7.4, 7.5, and 7.6 is vulnerable to a stack buffer overflow, caused by improper bounds checking in the QFileSvr.400 file system. By sending a command in the QFileSvr.400 file system, a local authenticated attacker could cause undefined behavior.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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
IBM	i	7.6	`cpe:2.3:a:ibm:i:7.5:::::::*`

II. Public POCs for CVE-2026-115501

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-115501

请登录查看更多情报信息。

Other References for CVE-2026-115501 (1)

Security Bulletin: IBM i is Affected By A Buffer Overflow Vulnerability in QFileSvr.400 File System [CVE-2026-115501] vendor-advisory patch

https://www.cve.org/CVERecord?id=CVE-2026-115501

Same Patch Batch · IBM · 2026-11-13 · 21 CVEs total

CVE-2026-91869	8.1 HIGH	IBM Security QRadar EDR Improper Restriction of Excessive Authentication Attempts
CVE-2026-115788	8.1 HIGH	IBM App Connect Operator and IBM App Connect Enterprise Certified Containers Operands Log
CVE-2026-110279	8.1 HIGH	IBM ContextForge MCP Gateway is affected by an improper authentication vulnerability
CVE-2026-109158	7.5 HIGH	IBM App Connect Operator and IBM App Connect Enterprise Certified Containers Operands Inse
CVE-2026-123628	7.5 HIGH	IBM webMethods Integration Server is vulnerable to sensitive information disclousure via a
CVE-2026-110278	7.4 HIGH	IBM ContextForge MCP Gateway is affected by an information exposure vulnerability
CVE-2026-91868	6.5 MEDIUM	IBM Security QRadar EDR Improper Access Control
CVE-2026-94407	6.5 MEDIUM	IBM ContextForge MCP Gateway is affected by a regular expression denial of service
CVE-2026-110189	6.5 MEDIUM	IBM ContextForge MCP Gateway is affected by a denial of service due to an incomplete list
CVE-2026-82102	6.4 MEDIUM	DataStage on Cloud Pak for Data has vulnerabilities due to open source software
CVE-2026-9870	6.1 MEDIUM	IBM Cyber Fraud includes components with multiple known vulnerabilities
CVE-2026-114468	6.0 MEDIUM	IBM App Connect Operator and IBM App Connect Enterprise Certified Containers Operands Hard
CVE-2026-110194	5.4 MEDIUM	IBM ContextForge MCP Gateway is affected by a server-side request forgery vulnerability
CVE-2026-110195	5.4 MEDIUM	IBM ContextForge MCP Gateway is affected by an authorization bypass vulnerability
CVE-2026-9821	5.3 MEDIUM	IBM Cyber Fraud includes components with multiple known vulnerabilities
CVE-2026-110199	4.8 MEDIUM	IBM ContextForge MCP Gateway is affected by a DOM-based cross-site scripting
CVE-2026-110178	4.1 MEDIUM	IBM ContextForge MCP Gateway is affected by an improper access control vulnerability in co
CVE-2026-108290	4.0 MEDIUM	IBM Cyber Fraud includes components with multiple known vulnerabilities
CVE-2026-5514	3.3 LOW	IBM Bob is vulnerable to unauthorized session token exposure due to improper handling of a
CVE-2026-97683	2.5 LOW	IBM Cyber Fraud includes components with multiple known vulnerabilities

IV. Related Vulnerabilities

Same product: i

Same vendor: IBM

Same weakness: CWE-121