CVE Explorer
CVE-2026-42209
FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both set_retained_message_defer_timeout and set_retained_message_defer_timeout_spread are configured to non-default values, resulting in denial of service. If anonymous retained publishing is allowed, no authentication is required; otherwise, the attacker needs the corresponding publish permission. This issue has been pa
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"FlashMQ","vendor":"halfgaar","versions":[{"status":"affected","version":"< 1.26.1"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:8e143889d80db78e66a1f4ff0e8c138ad79cabace89115647cc10a9285d8944d · sha256:2a9650764f9f78ba… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:8e143889d80db78e66a1f4ff0e8c138ad79cabace89115647cc10a9285d8944d · sha256:2a9650764f9f78ba… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-369","description":"CWE-369: Divide By Zero","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:8e143889d80db78e66a1f4ff0e8c138ad79cabace89115647cc10a9285d8944d · sha256:2a9650764f9f78ba… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"name":"https://github.com/halfgaar/FlashMQ/commit/193b6e7767889511cfa8e933908ea5e6a1077a1f","tags":["x_refsource_MISC"],"url":"https://github.com/halfgaar/FlashMQ/commit/193b6e7767889511cfa8e933908ea5e6a1077a1f"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8e143889d80db78e66a1f4ff0e8c138ad79cabace89115647cc10a9285d8944d · sha256:2a9650764f9f78ba… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://github.com/halfgaar/FlashMQ/issues/167"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8e143889d80db78e66a1f4ff0e8c138ad79cabace89115647cc10a9285d8944d · sha256:2a9650764f9f78ba… · /containers/adp/0/references/0
{"name":"https://github.com/halfgaar/FlashMQ/issues/167","tags":["x_refsource_MISC"],"url":"https://github.com/halfgaar/FlashMQ/issues/167"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8e143889d80db78e66a1f4ff0e8c138ad79cabace89115647cc10a9285d8944d · sha256:2a9650764f9f78ba… · /containers/cna/references/1
{"name":"https://github.com/halfgaar/FlashMQ/releases/tag/v1.26.1","tags":["x_refsource_MISC"],"url":"https://github.com/halfgaar/FlashMQ/releases/tag/v1.26.1"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8e143889d80db78e66a1f4ff0e8c138ad79cabace89115647cc10a9285d8944d · sha256:2a9650764f9f78ba… · /containers/cna/references/3
{"name":"https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-2789-vfcg-5922","tags":["x_refsource_CONFIRM"],"url":"https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-2789-vfcg-5922"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8e143889d80db78e66a1f4ff0e8c138ad79cabace89115647cc10a9285d8944d · sha256:2a9650764f9f78ba… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.