CVE-2026-63362 (GCVE-0-2026-63362)
Vulnerability from cvelistv5 – Published: 2026-07-30 22:01 – Updated: 2026-07-31 15:48
VLAI
EPSS
VEX
Title
o6 Automation open62541 Integer Underflow
Summary
An unsigned integer underflow in the PubSub signature verification path
in open62541 may allow a remote attacker to cause a denial of service
via a crafted UDP packet.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
7 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| o6 Automation | open62541 |
Affected:
1.3.0 , ≤ 1.3.17
(custom)
Affected: 1.4.0 , ≤ 1.4.16 (custom) Affected: 1.5.0 , ≤ 1.5.4 (custom) Affected: master |
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The new \\nversion can be obtained by contacting o6 Automation\\u00a0\\u00a0 https://www.o6-automation.com/contact \\nor by downloading from the \\nfollowing locations:\\n https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f \\n https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60 \\n https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e \\n https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df \\n\\n\\n\\n\\nFor more information, see open62541 \\nSecurity Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or \\ncontact o6 Automation:\\u00a0 https://www.o6-automation.com/contact\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eo6 Automation has prepared mitigations and fixes to address these \\nissues and recommends that users update to the newest version. The new \\nversion can be obtained by contacting o6 Automation\u0026nbsp;\u0026nbsp;\u003ca href=\\\"https://www.o6-automation.com/contact\\\"\u003ehttps://www.o6-automation.com/contact\u003c/a\u003e\\nor by downloading from the \\nfollowing locations:\u003cbr\u003e\u003ca href=\\\"https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f\\\"\u003ehttps://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f\u003c/a\u003e\u003cbr\u003e\u003ca href=\\\"https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60\\\"\u003ehttps://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60\u003c/a\u003e\u003cbr\u003e\u003ca href=\\\"https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e\\\"\u003ehttps://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e\u003c/a\u003e\u003cbr\u003e\u003ca href=\\\"https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df\\\"\u003ehttps://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df\u003c/a\u003e\u003c/p\u003e\\n\u003cp\u003eFor more information, see open62541 \\nSecurity Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or \\ncontact o6 Automation:\u0026nbsp;\u003ca href=\\\"https://www.o6-automation.com/contact\\\"\u003ehttps://www.o6-automation.com/contact\u003c/a\u003e\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://www.o6-automation.com/contact\"}, {\"url\": \"https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f\"}, {\"url\": \"https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60\"}, {\"url\": \"https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e\"}, {\"url\": \"https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df\"}, {\"url\": \"https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08\"}, {\"url\": \"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json\"}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.4\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"An unsigned integer underflow in the PubSub signature verification path \\nin open62541 may allow a remote attacker to cause a denial of service \\nvia a crafted UDP packet.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"An unsigned integer underflow in the PubSub signature verification path \\nin open62541 may allow a remote attacker to cause a denial of service \\nvia a crafted UDP packet.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-191\", \"description\": \"CWE-191\"}]}], \"providerMetadata\": {\"orgId\": \"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6\", \"shortName\": \"icscert\", \"dateUpdated\": \"2026-07-30T22:01:48.523Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-63362\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-31T15:48:40.485Z\", \"dateReserved\": \"2026-07-27T15:02:47.793Z\", \"assignerOrgId\": \"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6\", \"datePublished\": \"2026-07-30T22:01:48.523Z\", \"assignerShortName\": \"icscert\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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