Acrobat Reader | Improper Certificate Validation (CWE-295) (CVE-2026-27221) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-27221

Acrobat Reader | Improper Certificate Validation (CWE-295)

Answer in brief

CVE-2026-27221 records a Unknown severity vulnerability in Acrobat Reader | Improper Certificate Validation (CWE-295). The current sources do not mark it as known exploited. The current feed maps Adobe/Acrobat 2024 (generic), Adobe/Acrobat DC (generic), Adobe/Acrobat Reader DC (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 Mar 10, 2026Updated Aug 27, 2026Source checked Aug 27, 2026First seen by HOL Aug 27, 2026Material review Aug 27, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 Adobe/Acrobat 2024 (generic), Adobe/Acrobat DC (generic), Adobe/Acrobat Reader DC (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Adobe/Acrobat 2024generic	0	Not reported
Adobe/Acrobat DCgeneric	0	Not reported
Adobe/Acrobat Reader DCgeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Adobe/Acrobat 2024, Adobe/Acrobat DC, Adobe/Acrobat Reader DC.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Mar 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 27, 2026

Sources and claim methodology

Source referencehelpx.adobe.com

Upstream source description

Acrobat Reader versions 24.001.30307, 24.001.30308, 25.001.21265 and earlier are affected by an Improper Certificate Validation vulnerability that could result in a Security feature bypass. An attacker could leverage this vulnerability to spoof the identity of a signer. Exploitation of this issue requires user interaction.

Quoted source text, attributed separately from HOL analysis.