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CVE-2026-54412

LiamBindle MQTT-C through version 1.1.6 contains a heap-based out-of-bounds read and integer underflow in the mqtt_unpack_publish_response() function in src/mqtt.c that allows a remote unauthenticated attacker controlling an MQTT broker - or able to inject MQTT traffic into an unencrypted session - to crash a subscribed MQTT-C client and potentially disclose adjacent heap memory by sending a single crafted PUBLISH packet. The function validates only that the fixed-header remaining_length is at l
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f539fd666c53faa1195b84a85f2ea396c30e7f517f386d3fd1e828e219a5bd39
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"YES","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.8,"baseSeverity":"HIGH","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"DIFFUSE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/AU:Y/V:D","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImp…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/metrics/0/cvssV4_0
cwe · 2 assertions

{"cweId":"CWE-191","description":"CWE-191 Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"collectionURL":"https://github.com/LiamBindle/MQTT-C","defaultStatus":"unknown","product":"MQTT-C","programFiles":["src/mqtt.c"],"programRoutines":[{"name":"mqtt_unpack_publish_response"}],"repo":"https://github.com/LiamBindle/MQTT-C","vendor":"LiamBindle","versions":[{"lessThanOrEqual":"1.1.6","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"YES","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.8,"baseSeverity":"HIGH","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"DIFFUSE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/AU:Y/V:D","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImp…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-191","description":"CWE-191 Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"CWE-125: Out-of-bounds Read","tags":["technical-description"],"url":"https://cwe.mitre.org/data/definitions/125.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/references/2
{"name":"CWE-191: Integer Underflow (Wrap or Wraparound)","tags":["technical-description"],"url":"https://cwe.mitre.org/data/definitions/191.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/references/3
{"name":"LiamBindle/MQTT-C - upstream repository (unmaintained since 2022-10-27)","tags":["product"],"url":"https://github.com/LiamBindle/MQTT-C"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/references/0
{"name":"Vulnerable mqtt_unpack_publish_response() in src/mqtt.c (v1.1.6)","tags":["product"],"url":"https://github.com/LiamBindle/MQTT-C/blob/v1.1.6/src/mqtt.c#L1334"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bbad9981d16215e1962b3ca9051267074909d38ea8adb82490ba8e1dc35b983e · sha256:01347e913d6b7063… · /containers/cna/references/1

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.

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