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Highest advisory severityCritical 2 vendors · 2 advisories

CVE-2026-71253

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Johnzon

CVE-2026-71253: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Johnzon. Not in the CISA KEV catalog.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

NVD detail CVE.org

CVE-2026-71253 at a glance

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Critical
CVSS base score
9.8 (Apache), 8.1 (Red Hat)
Weakness
CWE-470
Fixed releases
  • Apache: 2.2.0, 1.3.1
Vendor advisories
2 from Apache, Red Hat
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-71253; bulletin-wide values are not repeated here.

Is CVE-2026-71253 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-71253 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-71253?

Upgrade to a fixed release named by the vendor:

  • Apache: 2.2.0, 1.3.1
  • Users are recommended to upgrade to version 1.3.1 (javax namespace) or 2.2.0 (jakarta specification namespace), which fixes the issue. (Apache)

Vendor advisory comparison

Apache

1 advisory
  • Advisory severityCritical9.8

    Critical [CVE-2026-71253] Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Johnzon

    CVE-2026-71253Source published Source updated

    Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Johnzon. ClassConverter loads & static-initializes an attacker-named class from untrusted JSON. This issue affects Apache Johnzon: from 1.0.0 before 2.2.0. Users are recommended to upgrade to version 1.3.1 (javax namespace) or 2.2.0 (jakarta specification namespace), which fixes the issue.

    Affected products in this advisory
    • Apache Johnzon
    Source-reported affected versions
    • 1.0.0 before 2.2.0
    Source-reported fixed versions
    • 2.2.0
    • 1.3.1
    Mitigation guidance
    • Users are recommended to upgrade to version 1.3.1 (javax namespace) or 2.2.0 (jakarta specification namespace), which fixes the issue.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh8.1

    High [CVE-2026-71253] Arbitrary code execution via unsafe class loading

    CVE-2026-71253Source published Source updated

    Arbitrary code execution via unsafe class loading. Red Hat rates this important (CVSS 8.1). Weakness: CWE-470. Affected product named by the advisory: Red Hat Fuse 7.

    Related products — impact not confirmed
    • Red Hat Fuse 7
    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

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