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Fencer Vulns
medium 5.9

CVE-2026-119276 json

MariaDB Connector/J: Rogue server can drive large heap allocations from server-declared lengths in OK packets

published 2026-10-29 10 d ago modified 2026-10-30 9 d ago also GHSA-h599-m3w5-9m7x , EUVD-2026-113383

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7, 3.4.5, and 3.5.11, when CLIENT_SESSION_TRACK was negotiated, the OkPacket.parse() and OkPacket.parseWithInfo() paths allocated byte arrays using server-declared lengths for the OK packet info field and session-state variable names and values before confirming that the bytes remained in the packet. A malicious or compromised server, or a machine-in-the-middle attacker, could send a small OK packet declaring a much larger length and repeatedly force attacker-controlled heap allocations before the subsequent copy failed. This could create garbage-collection pressure or an OutOfMemoryError in the client application. This issue is fixed in versions 3.3.7, 3.4.5, and 3.5.11.

Patch / fix

  • maven org.mariadb.jdbc:mariadb-java-client 3.3.7, 3.4.5, 3.5.11
  • mariadb-java-client openSUSE Tumbleweed 3.5.11-1.1

opensuse advisories openSUSE-SU-2026:12401-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-119276 updated cvss 5.9

org.mariadb.jdbc/mariadb-java-client: mariadb-java-client: Denial of Service via uncontrolled memory allocation

  • Red Hat build of Debezium 3 mariadb-java-client 3.5.3.redhat-00001 Red Hat Build of Keycloak rhbk/keycloak-rhel9, mariadb-java-client 3.5.3.redhat-00001
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Quarkus mariadb-java-client 3.5.3.redhat-00001
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 8 Judy, galera, mariadb, mariadb-pam, mariadb-test, mariadb-backup, +8 more Red Hat Enterprise Linux 9 mariadb-java-client 3.4.0-2.el10 Red Hat Enterprise Linux 10 mariadb-java-client 3.4.0-2.el10 Red Hat OpenShift AI (RHOAI) rhoai/odh-trustyai-service-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenStack Platform 13 (Queens) mariadb, mariadb-libs, mariadb-test, mariadb-common, mariadb-config, mariadb-errmsg, +3 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Satellite 6 candlepin, candlepin-selinux
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images mariadb10.11 10.11.18-4.1.2.hum1
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 d ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.mariadb.jdbc:mariadb-java-client
>=3.0.0, <3.3.7
>=3.4.0, <3.4.5
>=3.5.0, <3.5.11
3.3.7
3.4.5
3.5.11

Affected products

  • mariadb-corporation mariadb-connector-j

Classification

Weakness
  • CWE-130 Improper Handling of Length Parameter Inconsistency
  • CWE-789 Memory Allocation with Excessive Size Value

References

Sources

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