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CVE-2026-58465

Eclipse Wakaama before snapshot/2026-05-26 contains an unbounded memory allocation vulnerability in the CoAP Block1 handler within coap/block.c that allows unauthenticated remote attackers to exhaust server memory by sending a sequence of Block1 PUT requests with incrementing block numbers. Attackers can target the registration endpoint over UDP without authentication, causing the server to repeatedly reallocate a growing accumulation buffer by appending each block payload without enforcing any
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4e1cc638d9883b97573cc12843395f068f25b9d2860c7e573ba45fce77263dbb
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"affected","packageURL":"pkg:github/eclipse-wakaama/wakaama","product":"wakaama","repo":"https://github.com/eclipse-wakaama/wakaama","vendor":"eclipse-wakaama","versions":[{"lessThan":"snapshot/2026-05-26","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Fix Patch","tags":["patch"],"url":"https://github.com/eclipse-wakaama/wakaama/commit/a83f1ca28fa090fbc03c3669fef40daf4f89cd03"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/references/2
{"name":"Fix PR","tags":["issue-tracking"],"url":"https://github.com/eclipse-wakaama/wakaama/pull/881"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/references/1
{"name":"Release Notes","tags":["release-notes"],"url":"https://github.com/eclipse-wakaama/wakaama/releases/tag/snapshots%2F2026-05-26"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/eclipse-wakaama-coap-block1-handler-unbounded-memory-allocation-dos"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9225d51dc43ec244f895b43ef0023b3a7471db615994b7418679e635fd3b4dc3 · sha256:8534e886a3deece1… · /containers/cna/references/3

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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