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  4. CVE 2026 124759 alarm frames are accepted from any source address
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Back to active CVEs
High · CVSS 7.1CVE-2026-124759

Alarm frames are accepted from any source addressCVE-2026-124759

Answer in brief

CVE-2026-124759 records a High severity (CVSS 7.1) vulnerability in Alarm frames are accepted from any source address. The current sources do not mark it as known exploited. The current feed maps RT-Labs/P-Net (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 13, 2026Updated Nov 13, 2026Source checked Nov 13, 2026First seen by HOL Nov 13, 2026Material review Nov 13, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.1. 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 RT-Labs/P-Net (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
RT-Labs/P-Netgeneric>=0 <1.0.4 || >=1.0.4 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for RT-Labs/P-Net.
  2. 2Review the reported fix. Source-reported solution: Upgrade to P-Net 1.0.4 or later, which ignores alarm frames that do not come from the IO-controller of the Application Relationship. It reduces the risk but does not remove it, see Remaining Risk.

Evidence timeline and material changes

  1. Published upstream

    Nov 13, 2026

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

  2. Source modified

    Nov 13, 2026

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

  3. First seen by HOL

    Nov 13, 2026

Sources and claim methodology

  • Source referencert-labs.com
Upstream source description

P-Net before 1.0.4 routes a received RTA alarm frame to an Application Relationship using only the destination alarm reference in the frame, without checking the source of the frame. A host with ADJACENT network access can abort an established Application Relationship with a single alarm ERROR frame, or deliver forged alarm notifications with chosen type, slot, subslot, USI and payload to the application.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Integer underflow of the record data length in IODWrite requestsSame rt-labs/p-net package
  • Alarm receiver stops delivering alarms after a malformed alarm notificationSame rt-labs/p-net package
  • A DCP Set of the IP suite that is refused is still storedSame rt-labs/p-net package
  • RPC reject, fault and cancel PDUs abort an Application RelationshipSame rt-labs/p-net package
  • Out-of-bounds write with too many MCR blocks in a Connect requestSame rt-labs/p-net package
  • Fragment with another data representation releases an Application RelationshipSame rt-labs/p-net package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-346
Source
CVE List V5
Source checked
Nov 13, 2026
References
1 linked source
Open source record