Critical severity · published Oct 8, 2026
CVE-2026-16340
IBM DataPower Gateway Out-of-bounds Write
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.0.0 through 11.0.0.2 could allow a remote attacker to execute arbitrary code due to an out-of-bounds write in the RFC2047 encoded-word parser.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DG
DataPower Gateway 10.5.0 · IBM
10.5.0.0 through 10.5.0.22 · source: vendor
DG
DataPower Gateway 10.6.0 · IBM
10.6.0.0 through 10.6.0.10 · source: vendor
DG
DataPower Gateway 10.6CD · IBM
10.6.1 through 10.6.6 · source: vendor
DG
DataPower Gateway 11.0.0 · IBM
11.0.0.0 through 11.0.0.2 · source: vendor
DG
Datapower Gateway · Ibm
10.5.0.0 before 10.5.0.23; 10.6.0.0 before 10.6.0.11; 10.6.1.0 before 11.0.0.3; 11.0.0.0 before 11.0.0.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-16340
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-16340
vendor-advisory
https://www.ibm.com/support/pages/node/7289775
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