CVE-2026-12118 Deserialization in webMethods Integration (on prem)
Unauthenticated remote attackers can execute arbitrary code on IBM webMethods Integration servers via unsafe deserialization of untrusted data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12118?
CVE-2026-12118 is a critical unsafe deserialization vulnerability in IBM webMethods Integration (on prem), published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
IBM webMethods Integration (on prem) 10.15, 10.11 could allow an unauthenticated remote attacker to execute arbitrary code on the system due to the deserialization of untrusted data.
Weakness: CWE-502
Which versions are affected by CVE-2026-12118?
It affects 1 product.
Products include Ibm Webmethods Integration.
How do I fix CVE-2026-12118?
No fix has been published for CVE-2026-12118 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-12118 being exploited?
There is no known exploitation of CVE-2026-12118 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in IBM webMethods Integration (on prem)
- CVE-2024-45076 IBM webMethods Integration code execution
- CVE-2025-36072 IBM webMethods Integration Deserialization
- CVE-2025-36049 IBM webMethods Integration Sever XML external entity injection
- CVE-2024-45075 IBM webMethods Integration privilege escalation
- CVE-2025-36202 IBM webMethods Integration code execution
Sources
Also known as GHSA-9597-g68j-5wfj.