{"id":"CVE-2026-12670","kind":"vulnerability","aliases":["CVE-2026-12670"],"related":[],"title":"IBM MQ Operator: crafted message lets authenticated user crash service","description":"IBM MQ could allow an authenticated attacker to cause a denial of service through a specially crafted message that triggers excessive memory operations during character set conversion.","summary":"IBM MQ Operator can be driven into excessive memory use during character set conversion by a specially crafted message. An authenticated attacker can use this to cause a denial of service.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"ibm mq operator","fixed":[],"affected":">= 2.0.0, <= 2.0.29","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":">= 3.2.0, <= 3.2.29","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.3.0","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.4.0","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.4.1","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.5.0","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.5.1","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.5.2","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.5.3","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.6.0","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.6.1","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.6.2","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.6.3","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.6.4","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.7.0","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.7.1","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.7.2","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.8.0","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.8.1","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.9.0","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.9.1","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 3.9.2","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 4.0.0","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 4.0.1","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 4.0.2","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 4.0.3","ecosystem":"vendor"},{"name":"ibm mq operator","fixed":[],"affected":"= 4.0.4","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.1.0","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.1.1","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.2.0","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.2.1","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.3.0","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.3.1","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.4.0","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.4.1","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.5.0","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.4.5.1","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 10.0.0.0","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 10.0.0.5","ecosystem":"vendor"},{"name":"ibm supplied mq advanced container images","fixed":[],"affected":"= 9.3.0.0","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["ibm-mq","kubernetes","messaging","openshift","vendor"],"not_affected_if":["auth-required","not-operator-deployment"],"how_to_check":"- Check the installed IBM MQ Operator version against the affected ranges (`2.0.0` to `2.0.29`, `3.2.0` to `3.2.29`, and exact versions `3.3.0` through `3.6.2`).\n- unknown for other checks; the sources do not describe specific settings or logs to inspect.","fix":"- Move the IBM MQ Operator to a fixed release; the sources do not name the fixed version numbers, so check IBM's security bulletin.","status":"open","published_at":"2026-10-19T17:17:19+00:00","first_seen_at":"2026-10-23T21:57:18+00:00","triaged_at":"2026-10-25T03:55:46+00:00","updated_at":"2026-10-25T03:55:46+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T03:55:46Z","model":"claude-haiku-5-5","output":{"fix":"- Move the IBM MQ Operator to a fixed release; the sources do not name the fixed version numbers, so check IBM's security bulletin.","reach":"network","title":"IBM MQ Operator: crafted message lets authenticated user crash service","impact":"medium","summary":"IBM MQ Operator can be driven into excessive memory use during character set conversion by a specially crafted message. An authenticated attacker can use this to cause a denial of service.","category":"vendor","nicknames":[],"who_cares":["ibm-mq","kubernetes","openshift","messaging"],"confidence":0.6,"needs_auth":"yes","worst_case":"Service becomes unavailable through excessive memory use on the queue manager.","analyst_note":"Find IBM's security bulletin for CVE-2026-12670 to confirm fixed versions for each Operator branch and whether messaging access is required.","how_to_check":"- Check the installed IBM MQ Operator version against the affected ranges (`2.0.0` to `2.0.29`, `3.2.0` to `3.2.29`, and exact versions `3.3.0` through `3.6.2`).\n- unknown for other checks; the sources do not describe specific settings or logs to inspect.","needs_analyst":true,"not_affected_if":["not-operator-deployment","auth-required"],"who_is_affected":"Teams running the IBM MQ Operator on Kubernetes or OpenShift within the listed version ranges. Exposure requires an account that can send messages to the queue manager; the sources do not say whether unauthenticated access is possible. Teams on other IBM MQ versions or not running the Operator are not listed as affected.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000662,"input_tokens":3608,"output_tokens":602,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-12670':13A,16A '-2026':12A,15A 'advanced':101A,107A,113A,119A,125A,131A,137A,143A,149A,155A,161A,167A,173A 'allow':217C 'attack':204B,220C 'authent':7A,203B,219C 'caus':209B,222C 'charact':194B,238C 'container':102A,108A,114A,120A,126A,132A,138A,144A,150A,156A,162A,168A,174A 'convers':196B,240C 'could':216C 'craft':4A,200B,230C 'crash':9A 'cve':11A,14A 'denial':211B,224C 'driven':188B 'excess':190B,234C 'ibm':1A,17A,20A,23A,26A,29A,32A,35A,38A,41A,44A,47A,50A,53A,56A,59A,62A,65A,68A,71A,74A,77A,80A,83A,86A,89A,92A,95A,98A,104A,110A,116A,122A,128A,134A,140A,146A,152A,158A,164A,170A,177B,183B,214C 'ibm-mq':176B 'images':103A,109A,115A,121A,127A,133A,139A,145A,151A,157A,163A,169A,175A 'kubernet':179B 'let':6A 'memori':191B,235C 'messag':5A,180B,201B,231C 'mq':2A,18A,21A,24A,27A,30A,33A,36A,39A,42A,45A,48A,51A,54A,57A,60A,63A,66A,69A,72A,75A,78A,81A,84A,87A,90A,93A,96A,100A,106A,112A,118A,124A,130A,136A,142A,148A,154A,160A,166A,172A,178B,184B,215C 'openshift':181B 'oper':3A,185B,236C 'operator':19A,22A,25A,28A,31A,34A,37A,40A,43A,46A,49A,52A,55A,58A,61A,64A,67A,70A,73A,76A,79A,82A,85A,88A,91A,94A,97A 'servic':10A,213B,226C 'set':195B,239C 'special':199B,229C 'supplied':99A,105A,111A,117A,123A,129A,135A,141A,147A,153A,159A,165A,171A 'trigger':233C 'use':192B,206B 'user':8A 'vendor':182B","nicknames":[],"mitigations":[],"who_affected":"Teams running the IBM MQ Operator on Kubernetes or OpenShift within the listed version ranges. Exposure requires an account that can send messages to the queue manager; the sources do not say whether unauthenticated access is possible. Teams on other IBM MQ versions or not running the Operator are not listed as affected.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-19T17:17:19+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvss_by":"psirt@us.ibm.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-12670","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12670","severity":null,"published_at":"2026-10-19T17:17:19+00:00","modified_at":"2026-10-23T17:18:28+00:00","first_seen_at":"2026-10-23T21:57:18+00:00","fetched_at":"2026-10-23T22:28:57+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}