MariaDB is widely deployed; vulnerability allows OOB reads/writes and potential RCE on DB servers, risking data loss/service disruption across organizations.
CVE-2026-107821
Crafted FRM files can trigger OOB read/write and possible RCE in MariaDB.
Is CVE-2026-107821 being exploited?
Not confirmed. CVE-2026-107821 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.48% probability of exploitation in the next 30 days.
How severe is CVE-2026-107821?
CVE-2026-107821 is rated High with a CVSS score of 8.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-107821?
Yes. A fix has been recorded for CVE-2026-107821. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-107821 affect?
CVE-2026-107821 affects MariaDB <10.6.28, <10.11.19, <11.4.13, <11.8.9, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-107821?
Upgrade to listed fixed versions immediately; restrict data-dir write access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
An attacker able to place a crafted FRM file in the data dir can cause OOB read/write, crash the server, or potentially execute code (RCE).
Immediate action required
- affected>= 10.6.1 and < 10.6.28
- affected>= 10.11.1 and < 10.11.19
- affected>= 11.4.1 and < 11.4.13
- affected>= 11.8.1 and < 11.8.9
- affected>= 12.3.1 and < 12.3.3
- affected>= 13.0.1 and < 13.0.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.