CVE catalog
CVE-2026-33592
DEBIAN-CVE-2026-33592
- Severity
- Unknown · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.52% · Oct 25, 2026
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 issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.
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/open62541/open62541]
- [https://github.com/open62541/open62541/pull/8142]
- [https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33592]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33592]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33592.json]
[FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]