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

published 2026-11-13 9h ago modified 2026-11-13 9h ago also EUVD-2026-125811

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: —; no EPSS score yet
public exploits: 0; none known

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.

Patch / fix

links 1

ibm.com/support/pages/node/7296188 advisory

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CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 9h ago (2026-11-13)

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
NVD	3.1	5.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected products

IBM i

Classification

Weakness

CWE-121 Stack-based Buffer Overflow

References

ibm.com /support/pages/node/7296188
vendor-advisory, patch

Sources

CVE List CVE-2026-115501
NVD CVE-2026-115501

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