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Response snapshot Oct 31, 2026, 01:26 UTC

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VulnerabilityCVE-2026-119279

MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated before being used as lengths

MariaDB Connector/J narrowed 8-byte length-encoded integers received from the server to int without validation. A rogue or MitM server can send a value above Integer.MAX_VALUE whose truncation becomes a negative or arbitrary length.

At a glance

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

What to do

GitHub lists first patched versions: org.mariadb.jdbc:mariadb-java-client: 3.3.7; org.mariadb.jdbc:mariadb-java-client: 3.4.5; org.mariadb.jdbc:mariadb-java-client: 3.5.10. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-797x-p4mc-jwpm (opens a new tab)

What happened

Summary

MariaDB Connector/J narrowed 8-byte length-encoded integers received from the server to int without validation. A rogue or MitM server can send a value above Integer.MAX_VALUE whose truncation becomes a negative or arbitrary length.

Details

The protocol encodes lengths as length-encoded integers, whose 8-byte form the decoder (readLength() and readIntLengthEncodedNotNull()) returned as (int) readLong(). A value above Integer.MAX_VALUE therefore wrapped to a negative or unrelated int, used afterwards as a length to size allocations or reads, which ended in NegativeArraySizeException, out-of-bounds exceptions or oversized allocations.

Continue reading

The fix rejects any length-encoded value that does not fit a non-negative int with an explicit error.

Impact

Availability only: a malicious or compromised server, or a MitM, can crash the client's connection handling with unchecked exceptions or drive oversized allocations. Exploitation requires control of the server side of the connection; no authentication bypass, confidentiality or integrity impact.

Credit

Reported by fg0x0

Affected package ranges reported by GitHub: org.mariadb.jdbc:mariadb-java-client: >= 3.0.0, < 3.3.7 org.mariadb.jdbc:mariadb-java-client: >= 3.4.0, < 3.4.5 org.mariadb.jdbc:mariadb-java-client: >= 3.5.0, < 3.5.10

Scores and how they were measured

CVSS base severity

5.9

Version 3.1As of

CVSS:3.1/AV:N/AC:H/PR:N/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-797x-p4mc-jwpm (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-797x-p4mc-jwpm, 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, October 30). MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated before being used as lengths (CVE-2026-119279). https://kevwire.com/record/CVE-2026-119279

MLA

"MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated before being used as lengths (CVE-2026-119279)." KEVWire, 30 Oct. 2026, kevwire.com/record/CVE-2026-119279.

Chicago

KEVWire. "MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated before being used as lengths (CVE-2026-119279)." Last modified October 30, 2026. https://kevwire.com/record/CVE-2026-119279.

Evidence summary (plain text)

MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated before being used as lengths (Oct 30, 2026).
MariaDB Connector/J narrowed 8-byte length-encoded integers received from the
server to int without validation. A rogue or MitM server can send a value above
Integer.MAX_VALUE whose truncation becomes a negative or arbitrary length.

The protocol encodes lengths as length-encoded integers, whose 8-byte form the
decoder (readLength() and readIntLengthEncodedNotNull()) returned as
(int) readLong().
CVSS 5.9 (version 3.1; evidence as of Oct 30, 2026; https://github.com/advisories/GHSA-797x-p4mc-jwpm).
Sources:
GitHub-reviewed advisory GHSA-797x-p4mc-jwpm: https://github.com/advisories/GHSA-797x-p4mc-jwpm
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-119279.
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: Oct 31, 2026, 00:50 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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