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Response snapshot Nov 4, 2026, 23:06 UTC

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VulnerabilityCVE-2026-12993

Apicurio Registry is vulnerable to denial of service through XML entity expansion

A flaw was found in Apicurio Registry. The DocumentBuilderAccessor correctly blocks external DTD and schema access but does not disable DOCTYPE declarations or enable FEATURE_SECURE_PROCESSING.

At a glance

Exploited
Not known
Severity
6.5 Medium (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: io.apicurio:apicurio-registry-schema-util-xml: 3.3.1; io.apicurio:apicurio-registry-schema-util-xml: 3.2.6. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-748j-wm96-4wh5 (opens a new tab)

What happened

A flaw was found in Apicurio Registry. The DocumentBuilderAccessor correctly blocks external DTD and schema access but does not disable DOCTYPE declarations or enable FEATURE_SECURE_PROCESSING. An attacker with artifact-write permission can upload XML documents with internal entity-expansion payloads (billion-laughs variant) that cause CPU and heap exhaustion, partially mitigated by the JAXP default 64,000 entity-expansion limit.

Affected package ranges reported by GitHub: io.apicurio:apicurio-registry-schema-util-xml: >= 3.3.0, < 3.3.1 io.apicurio:apicurio-registry-schema-util-xml: < 3.2.6

Scores and how they were measured

CVSS base severity

6.5

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-748j-wm96-4wh5 (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-748j-wm96-4wh5, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 4). Apicurio Registry is vulnerable to denial of service through XML entity expansion (CVE-2026-12993). https://kevwire.com/record/CVE-2026-12993

MLA

"Apicurio Registry is vulnerable to denial of service through XML entity expansion (CVE-2026-12993)." KEVWire, 4 Nov. 2026, kevwire.com/record/CVE-2026-12993.

Chicago

KEVWire. "Apicurio Registry is vulnerable to denial of service through XML entity expansion (CVE-2026-12993)." Last modified November 4, 2026. https://kevwire.com/record/CVE-2026-12993.

Evidence summary (plain text)

Apicurio Registry is vulnerable to denial of service through XML entity expansion (Jun 26, 2026).
A flaw was found in Apicurio Registry. The DocumentBuilderAccessor correctly blocks external DTD and schema access but does not disable DOCTYPE declarations or enable FEATURE_SECURE_PROCESSING. An attacker with artifact-write permission can upload XML documents with internal entity-expansion payloads (billion-laughs variant) that cause CPU and heap exhaustion, partially mitigated by the JAXP default 64,000 entity-expansion limit.
CVSS 6.5 (version 3.1; evidence as of Nov 4, 2026; https://github.com/advisories/GHSA-748j-wm96-4wh5).
Sources:
GitHub-reviewed advisory GHSA-748j-wm96-4wh5: https://github.com/advisories/GHSA-748j-wm96-4wh5
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-12993.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 4, 2026, 23:05 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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