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Back to active CVEs
High · CVSS 7.5CVE-2026-120596

CVE-2026-120596CVE-2026-120596

Answer in brief

CVE-2026-120596 records a High severity (CVSS 7.5) vulnerability in CVE-2026-120596. The current sources do not mark it as known exploited. The current feed maps Ethernut / egnite GmbH/Nut/Net TCP/IP Stack (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 2, 2026Updated Nov 2, 2026Source checked Nov 3, 2026First seen by HOL Nov 2, 2026Material review Nov 2, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Ethernut / egnite GmbH/Nut/Net TCP/IP Stack (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Ethernut / egnite GmbH/Nut/Net TCP/IP StackgenericNut/OS 5.1Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Ethernut / egnite GmbH/Nut/Net TCP/IP Stack.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 2, 2026

Sources and claim methodology

  • Source referenceethernut.de
Upstream source description

A remotely exploitable denial-of-service vulnerability exists in the TCP options parser of the Nut/Net TCP/IP stack included in Nut/OS, developed by Ethernut/Egnite. Nut/OS releases up to version 5.1 are affected. An unauthenticated attacker can send a single TCP segment containing an unknown TCP option with a length byte of zero to any open TCP port on a vulnerable device. When processed, this malformed option triggers an infinite loop in the function NutTcpInputOptions, permanently blocking the TCP processing thread and rendering all TCP-based services unresponsive until the device is rebooted.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • IrfanView TIFF Wang Annotation heap-based overflowAlso CWE-119
  • Authenticated Buffer Overflow Vulnerability Leads to Denial-of-Service in HPE Networking VIAAlso CWE-119

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-835, CWE-119, CWE-20
Source
CVE List V5
Source checked
Nov 3, 2026
References
1 linked source
Open source record