CVE-2026-55976
Apache Hive: SSRF vulnerability in Hive Avro Serde due to Insufficient input validation on avro.schema.url
Description
Server-Side Request Forgery (SSRF) in Avro SerDe schema resolution in Apache Hive before 4.2.1 allows an authenticated remote attacker with CREATE TABLE privilege to cause the Hive server to fetch an attacker-controlled URL when resolving the avro.schema.url table property on an Avro table that is subsequently queried. This can expose cloud instance metadata, internal network services, or local server files to the Hive process identity. Users are recommended to upgrade to version 4.2.1, which fixes this issue. Attacker access requirements: * Network access to HiveServer2 / Metastore: required (remote attacker model). * Valid Hive authentication: required. * CREATE TABLE (or equivalent) privilege: required, so the attacker can set avro.schema.url in table properties. * SELECT privilege on the malicious table: not required for the creator, who can typically query their own table; any other user granted SELECT can also trigger the fetch. * Write access to the table LOCATION: not required; the attack uses the schema URL, not the data path. * Admin / superuser privileges: not required; an ordinary authenticated user with DDL rights is sufficient. * External tables enabled: typically required in practice, and enabled by default in most deployments. Detection guidance: * Inspect metastore / Hive table metadata for Avro tables whose avro.schema.url uses unexpected schemes such as http, https, file, or ftp, or points at link-local / cloud metadata addresses (for example 169.254.169.254) or other internal hosts. * Review HiveServer2 and Metastore logs around CREATE/ALTER TABLE and queries against Avro tables for schema-resolution failures or outbound fetches of avro.schema.url. * Correlate CREATE TABLE / ALTER TABLE activity that sets avro.schema.url with subsequent SELECT activity on the same table, especially when the URL target is unusual for schema distribution. * On cloud deployments, check instance / VPC flow logs and metadata service access logs for unexpected requests from Hive host identities shortly after Avro DDL or query activity.
INFO
Published Date :
Aug. 25, 2026, 11:16 a.m.
Last Modified :
Sept. 28, 2026, 11:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade Apache Hive to version 4.2.1.
- Inspect Avro tables for unusual avro.schema.url values.
- Review logs for schema resolution and outbound fetches.
- Monitor cloud instance metadata service access.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55976.
| URL | Resource |
|---|---|
| https://github.com/apache/hive | Product |
| https://github.com/apache/hive/commit/45049202df35cea382616624de3fe8d252aa2d00 | Patch |
| https://issues.apache.org/jira/browse/HIVE-29671 | Vendor Advisory |
| https://lists.apache.org/thread/6d56mk501fp4f8cb5wvrpj2jwd9knt05 | Mailing List Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55976 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55976
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55976 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55976 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Sep. 28, 2026
Action Type Old Value New Value Added Translation Title: Apache Hive de Apache Software Foundation, Description: Falsificación de petición del lado del servidor (SSRF) en la resolución de esquemas Avro SerDe en Apache Hive anterior a la versión 4.2.1 permite a un atacante remoto autenticado con privilegio CREATE TABLE hacer que el servidor Hive obtenga una URL controlada por el atacante al resolver la propiedad de tabla avro.schema.url en una tabla Avro que es consultada posteriormente. Esto puede exponer metadatos de instancias en la nube, servicios de red internos o archivos de servidor locales a la identidad del proceso de Hive. Se recomienda a los usuarios actualizar a la versión 4.2.1, que corrige este problema. Requisitos de acceso del atacante: * Acceso a la red a HiveServer2 / Metastore: requerido (modelo de atacante remoto). * Autenticación válida de Hive: requerida. * Privilegio CREATE TABLE (o equivalente): requerido, para que el atacante pueda establecer avro.schema.url en las propiedades de la tabla. * Privilegio SELECT en la tabla maliciosa: no requerido para el creador, quien normalmente puede consultar su propia tabla; cualquier otro usuario con privilegio SELECT también puede activar la obtención. * Acceso de escritura a la LOCATION de la tabla: no requerido; el ataque utiliza la URL del esquema, no la ruta de los datos. * Privilegios de administrador / superusuario: no requeridos; un usuario autenticado ordinario con derechos DDL es suficiente. * Tablas externas habilitadas: típicamente requeridas en la práctica, y habilitadas por defecto en la mayoría de las implementaciones. Guía de detección: * Inspeccionar los metadatos de la tabla metastore / Hive en busca de tablas Avro cuya avro.schema.url utilice esquemas inesperados como http, https, file o ftp, o apunte a direcciones de metadatos link-local / en la nube (por ejemplo, 169.254.169.254) u otros hosts internos. * Revisar los registros de HiveServer2 y Metastore en torno a CREATE/ALTER TABLE y las consultas contra tablas Avro en busca de fallos en la resolución de esquemas o de obtenciones salientes de avro.schema.url. * Correlacionar la actividad CREATE TABLE / ALTER TABLE que establece avro.schema.url con la actividad SELECT posterior en la misma tabla, especialmente cuando el destino de la URL es inusual para la distribución de esquemas. * En implementaciones en la nube, verificar los registros de flujo de instancias / VPC y los registros de acceso al servicio de metadatos en busca de solicitudes inesperadas de identidades de host de Hive poco después de la actividad DDL o de consulta de Avro. -
Initial Analysis by [email protected]
Aug. 28, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:hive:4.2.0:*:*:*:*:*:*:* Added Reference Type Apache Software Foundation: https://github.com/apache/hive Types: Product Added Reference Type Apache Software Foundation: https://github.com/apache/hive/commit/45049202df35cea382616624de3fe8d252aa2d00 Types: Patch Added Reference Type Apache Software Foundation: https://issues.apache.org/jira/browse/HIVE-29671 Types: Vendor Advisory Added Reference Type Apache Software Foundation: https://lists.apache.org/thread/6d56mk501fp4f8cb5wvrpj2jwd9knt05 Types: Mailing List, Vendor Advisory -
CVE Modified by [email protected]
Aug. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/apache/hive Added Reference https://github.com/apache/hive/commit/45049202df35cea382616624de3fe8d252aa2d00 Added Reference https://issues.apache.org/jira/browse/HIVE-29671 Added Reference https://lists.apache.org/thread/6d56mk501fp4f8cb5wvrpj2jwd9knt05 Removed Reference https://github.com/apache/hive Removed Reference https://github.com/apache/hive/commit/45049202df35cea382616624de3fe8d252aa2d00 Removed Reference https://issues.apache.org/jira/browse/HIVE-29671 Removed Reference https://lists.apache.org/thread/6d56mk501fp4f8cb5wvrpj2jwd9knt05 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 26, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Added SSVC {'id': 'CVE-2026-55976', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-26T18:50:37.199246Z'} -
New CVE Received by [email protected]
Aug. 25, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apache Software Foundation', 'product': 'Apache Hive', 'versions': [{'status': 'affected', 'version': '2.1.0', 'versionType': 'semver', 'lessThanOrEqual': '4.2.0'}], 'packageName': 'org.apache.hive:hive-serde', 'collectionURL': 'https://repo.maven.apache.org/maven2', 'defaultStatus': 'unaffected'}] Added Description Server-Side Request Forgery (SSRF) in Avro SerDe schema resolution in Apache Hive before 4.2.1 allows an authenticated remote attacker with CREATE TABLE privilege to cause the Hive server to fetch an attacker-controlled URL when resolving the avro.schema.url table property on an Avro table that is subsequently queried. This can expose cloud instance metadata, internal network services, or local server files to the Hive process identity. Users are recommended to upgrade to version 4.2.1, which fixes this issue. Attacker access requirements: * Network access to HiveServer2 / Metastore: required (remote attacker model). * Valid Hive authentication: required. * CREATE TABLE (or equivalent) privilege: required, so the attacker can set avro.schema.url in table properties. * SELECT privilege on the malicious table: not required for the creator, who can typically query their own table; any other user granted SELECT can also trigger the fetch. * Write access to the table LOCATION: not required; the attack uses the schema URL, not the data path. * Admin / superuser privileges: not required; an ordinary authenticated user with DDL rights is sufficient. * External tables enabled: typically required in practice, and enabled by default in most deployments. Detection guidance: * Inspect metastore / Hive table metadata for Avro tables whose avro.schema.url uses unexpected schemes such as http, https, file, or ftp, or points at link-local / cloud metadata addresses (for example 169.254.169.254) or other internal hosts. * Review HiveServer2 and Metastore logs around CREATE/ALTER TABLE and queries against Avro tables for schema-resolution failures or outbound fetches of avro.schema.url. * Correlate CREATE TABLE / ALTER TABLE activity that sets avro.schema.url with subsequent SELECT activity on the same table, especially when the URL target is unusual for schema distribution. * On cloud deployments, check instance / VPC flow logs and metadata service access logs for unexpected requests from Hive host identities shortly after Avro DDL or query activity. Added CWE CWE-918 Added Reference https://github.com/apache/hive Added Reference https://github.com/apache/hive/commit/45049202df35cea382616624de3fe8d252aa2d00 Added Reference https://issues.apache.org/jira/browse/HIVE-29671 Added Reference https://lists.apache.org/thread/6d56mk501fp4f8cb5wvrpj2jwd9knt05