IBM MQ Buffer Overflow

published 2026-10-19 21 d ago modified 2026-10-23 17 d ago also EUVD-2026-104463

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits: 0; none known

IBM MQ could allow an authenticated attacker to cause potential process instability due to an off-by-one buffer overflow when processing specially crafted object names.

Patch / fix

fixed in 1 links 1

IBM MQ Operator 3.4.0

ibm.com/support/pages/node/7292667 advisory

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 21 d ago (2026-10-19)

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected products

IBM MQ Operator
IBM MQ Advanced container images

Classification

Weakness

CWE-193 Off-by-one Error

References

ibm.com /support/pages/node/7292667
vendor-advisory, patch

Sources

CVE List CVE-2026-12727
NVD CVE-2026-12727

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary