Critical · CVSS 9.3CVE-2026-100730

Grid Protection Alliance openPDC and openHistorian Deserialization of Untrusted DataCVE-2026-100730

Answer in brief

CVE-2026-100730 records a Critical severity (CVSS 9.3) vulnerability in Grid Protection Alliance openPDC and openHistorian Deserialization of Untrusted Data. The current sources do not mark it as known exploited. The current feed maps Grid Protection Alliance/openHistorian (generic), Grid Protection Alliance/openPDC (generic), Grid Protection Alliance/openPDC (Docker image) (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 Oct 9, 2026Updated Oct 9, 2026Source checked Oct 9, 2026First seen by HOL Oct 9, 2026Material review Oct 9, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.3
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.3. 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 Grid Protection Alliance/openHistorian (generic), Grid Protection Alliance/openPDC (generic), Grid Protection Alliance/openPDC (Docker image) (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Grid Protection Alliance/openHistoriangeneric	>=0 <2.8.580 \|\| >=0 <2.8.585	2.8.580, 2.8.585
Grid Protection Alliance/openPDCgeneric	>=0 <2.9.477 \|\| >=0 <2.9.482	2.9.477, 2.9.482
Grid Protection Alliance/openPDC (Docker image)generic	>=0 <2.9.477 \|\| >=0 <2.9.482	2.9.477, 2.9.482

Recommended response

Check inventory. Check lockfiles and deployed manifests for Grid Protection Alliance/openHistorian, Grid Protection Alliance/openPDC, Grid Protection Alliance/openPDC (Docker image).
Review the reported fix. Source-reported solution: Grid Protection Alliance has added additional validation into serialization logic in openPDC version 2.9.482 and later and openHistorian version 2.8.585 and later. Systems using Windows Authentication are additionally protected, as they require the attacker to already be authenticated to reach this function.

Evidence timeline and material changes

Published upstream
Oct 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 9, 2026

Sources and claim methodology

Upstream source description

A service console interface on openPDC and openHistorian deserializes a client-supplied data structure. On systems using Windows Authentication, an attacker must already be authenticated to reach this function; on systems without Windows Authentication, this is reachable by an unauthenticated network attacker. This allows an attacker to trigger deserialization of an arbitrary object graph, which could allow remote code execution under the privileges of the affected service account.

Quoted source text, attributed separately from HOL analysis.