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CVE-2026-33592

An unauthenticated remote attacker can exhaust server memory via the FindServers Discovery Service in open62541. The serverUris field of FindServersRequest is not validated for length or array size. An attacker can declare an arbitrarily large string (up to ~3.9 GB) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configuration. The 
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e4b8594761a686f3d6173bd11a56ff238e378462fab2cacce0e87506078797b4
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-770","description":"CWE-770 Allocation of resources without limits or throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:853bb4a36ac1e24f74c4bcf0ea2cad38a95aa25e440db8b0468f6e9a0652049d · sha256:033a66498441d269… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-789","description":"CWE-789 Memory allocation with excessive size value","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:853bb4a36ac1e24f74c4bcf0ea2cad38a95aa25e440db8b0468f6e9a0652049d · sha256:033a66498441d269… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"open62541","vendor":"open62541 project / o6 Automation GmbH","versions":[{"lessThanOrEqual":"1.4.16","status":"affected","version":"1.4.0","versionType":"semver"},{"lessThanOrEqual":"1.5.4","status":"affected","version":"1.5.0","versionType":"semver"},{"status":"affected","version":"master","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:853bb4a36ac1e24f74c4bcf0ea2cad38a95aa25e440db8b0468f6e9a0652049d · sha256:033a66498441d269… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"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:v2:853bb4a36ac1e24f74c4bcf0ea2cad38a95aa25e440db8b0468f6e9a0652049d · sha256:033a66498441d269… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-770","description":"CWE-770 Allocation of resources without limits or throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:853bb4a36ac1e24f74c4bcf0ea2cad38a95aa25e440db8b0468f6e9a0652049d · sha256:033a66498441d269… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-789","description":"CWE-789 Memory allocation with excessive size value","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:853bb4a36ac1e24f74c4bcf0ea2cad38a95aa25e440db8b0468f6e9a0652049d · sha256:033a66498441d269… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"tags":["product"],"url":"https://github.com/open62541/open62541"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:853bb4a36ac1e24f74c4bcf0ea2cad38a95aa25e440db8b0468f6e9a0652049d · sha256:033a66498441d269… · /containers/cna/references/2
{"tags":["patch"],"url":"https://github.com/open62541/open62541/pull/8142"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:853bb4a36ac1e24f74c4bcf0ea2cad38a95aa25e440db8b0468f6e9a0652049d · sha256:033a66498441d269… · /containers/cna/references/0
{"tags":["patch"],"url":"https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:853bb4a36ac1e24f74c4bcf0ea2cad38a95aa25e440db8b0468f6e9a0652049d · sha256:033a66498441d269… · /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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