CVE catalog
CVE-2026-63362
DEBIAN-CVE-2026-63362
- Severity
- Unknown · CVSS 8.2
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 1.82% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | open62541 | 13 | 1.4.11.1-1 | vulnerable |
| Debian | open62541 | 13 | 1.4.18-1 | vulnerable |
| Debian | open62541 | 14 | 1.4.11.1-1 | vulnerable |
| Debian | open62541 | 14 | 1.4.18-1 | vulnerable |
Fixed-version evidence
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [libopen62541-1.4]Affected
Source package: [open62541]
Details (2)
1.4.11.1-1· amd64 · trixieAffected
pypi · open62541 · debian · 13
1.4.11.1-1· arm64 · trixieAffected
pypi · open62541 · debian · 13
- [libopen62541-1.4-dev]Affected
Source package: [open62541]
Details (2)
1.4.11.1-1· amd64 · trixieAffected
pypi · open62541 · debian · 13
1.4.11.1-1· arm64 · trixieAffected
pypi · open62541 · debian · 13
- [libopen62541-1.4-tools]Affected
Source package: [open62541]
Details (2)
1.4.11.1-1· all · trixieAffected
pypi · open62541 · debian · 13
1.4.11.1-1· all · trixieAffected
pypi · open62541 · debian · 13
Observed:
References
- [https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json]
- [https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f]
- [https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60]
- [https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e]
- [https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-63362]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-63362]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63362.json]
- [https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08]
- [https://www.o6-automation.com/contact]
[FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]