IBM MQ is affected by a denial of service vulnerability
Affects IBM MQ 9.2.0.0-9.2.0.44 LTS, 9.3.0.0-9.3.0.42 LTS, 9.4.0.0-9.4.0.26 LTS, 9.4.0.0-9.4.5.1 CD and 10.0.0.0-10.0.0.5 LTS/CD with the MQ Server component. The listed fix is cumulative security update 9.2.0.46.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 9.2.0.46
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affects IBM MQ 9.2.0.0 to 9.2.0.44 LTS, 9.3.0.0 to 9.3.0.42 LTS, 9.4.0.0 to 9.4.0.26 LTS, 9.4.0.0 to 9.4.5.1 CD, and 10.0.0.0 to 10.0.0.5 LTS and CD Affects the MQ Server installable component
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity8.8/10CVSS 8.8
- No patch0/5No signal
What would change the score
- Would score about 67 if added to CISA KEV
- Would score about 62 if CISA's SSVC rates exploitation active
- Would score about 24 if CISA's SSVC rates it automatable
CVE-2026-11376 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.8 (high) and affects MQ; fixed in 9.2.0.46.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 17/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Fix
- Fixed in 9.2.0.46
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
IBM MQ is affected by a denial of service vulnerability caused by an integer overflow when it processes subscription requests with crafted buffer size values. An attacker who can log in with low-privilege credentials can reach it remotely over the network and can crash the service or potentially execute arbitrary code.
Read the original description
IBM MQ 9.2.0.0 through 9.2.0.44 LTS, 9.3.0.0 through 9.3.0.42 LTS, 9.4.0.0 through 9.4.0.26 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 through 10.0.0.5 LTS and CD could allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code due to an integer overflow when processing subscription requests with crafted buffer size values.
What to do
Check whether your setup matches what the bug needs.
Affects IBM MQ 9.2.0.0 to 9.2.0.44 LTS, 9.3.0.0 to 9.3.0.42 LTS, 9.4.0.0 to 9.4.0.26 LTS, 9.4.0.0 to 9.4.5.1 CD, and 10.0.0.0 to 10.0.0.5 LTS and CD Affects the MQ Server installable componentUpgrade to a fixed version: 9.2.0.46.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- IBM MQ
From 9.2.0.0 · through 9.2.0.44; From 9.3.0.0 · through 9.3.0.42; From 9.4.0.0 · through 9.4.0.26; From 9.4.0.0 · through 9.4.5.1; From 10.0.0.0 · through 10.0.0.5
Evidence 1
- Patch
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-11376
Is CVE-2026-11376 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A flaw in how MQ processes subscription requests with crafted buffer size values causes an integer overflow. An authenticated attacker could use it to cause a denial of service, and the advisory says it could potentially lead to arbitrary code execution.Source: ibm.com
Which versions are affected by CVE-2026-11376?
MQ: from 9.2.0.0 through 9.2.0.44; from 9.3.0.0 through 9.3.0.42; from 9.4.0.0 through 9.4.0.26; from 9.4.0.0 through 9.4.5.1; from 10.0.0.0 through 10.0.0.5.Source: cve.now feed data
Am I affected, and how do I check?
The advisory lists IBM MQ 9.2.0.0 to 9.2.0.44 LTS, 9.3.0.0 to 9.3.0.42 LTS, 9.4.0.0 to 9.4.0.26 LTS, 9.4.0.0 to 9.4.5.1 CD, and 10.0.0.0 to 10.0.0.5 LTS and CD. It applies to the MQ Server installable component. To check a version, run dspmqver on the MQ server and compare the reported version with these ranges.Source: ibm.com
How do I fix CVE-2026-11376?
Apply cumulative security update 9.2.0.46, which is the fix named in the advisory.Source: ibm.com