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CVE-2026-18535

IBM API Connect Denial of Service

publishedCWE-1333

IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 are vulnerable to a Regular Expression Denial of Service (ReDoS) attack and to improper neutralisation of wildcard query operators.

Technical severity9.6 criticalCVSS 3.1 · CNA: ibm
Published2026-11-07Source updated 2026-11-07
Collected2026-11-072 attributed sources

Fixes and workarounds

Fix

IBM strongly recommends addressing the vulnerability now by upgrading to v12.1.1.3 Fix Central Link: https://www.ibm.com/support/pages/node/7290205 IBM strongly recommends addressing the vulnerability now by upgrading to 10.0.8.13 Fix Central Link: https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm%7EWebSphere&product=ibm/WebSphere/IBM+API+Connect&release=10.0.8.12&platform=All&function=all

Source: CNA: ibm

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: ibm

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: ibm

Affected products and versions

ProductVersionsAuthority
API Connect
IBM 		≥ 12.1.0.0; ≤ 12.1.1.2 (affected, semver)
≥ 10.0.8.0; ≤ 10.0.8.12 (affected, semver)
Other versions: unaffected 		CNA: ibm

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

Version / scoreVectorAuthority
3.1 / 9.6
critical		 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:HCNA: ibm
3.1 / 9.6
critical		 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:HNVD: [email protected]

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

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