CVE-2026-31243: The mem0 1.0.0 server lacks authentication and authorization controls for its memory reset and table re-creati

Routine

MEDIUM 6.5REMOTEDOWNGRADE

CVE-2026-31243 is a medium-severity flaw (CVSS 6.5) affecting mem0. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The mem0 1.0.0 server lacks authentication and authorization controls for its memory reset and table re-creation functionality accessible via the DELETE /memories endpoint. An unauthenticated attacker can send a DELETE request that triggers a reset operation, leading to the execution of a CREATE TABLE SQL statement. This can cause unexpected table re-creation, schema disruption, potential data loss, and denial of service for the memory management

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-306, CWE-862
Published	2026-05-12
Last modified	2026-10-19

Publisher (CNA): MITRE · Vendor: mem0

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 18:16 UTCPublished CVE record published
2026-10-19 22:10 UTCUpdated Record last modified

mem0 mem0 DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy mem0 || rpm -q mem0 || mem0 --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison mem0 sudo apt install mem0=<VERSION_BEFORE_1.0.0> sudo apt-mark hold mem0

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mem0 sudo dnf downgrade mem0-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add mem0

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-31243?

mem0: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-31243 being exploited?

CVE-2026-31243 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-31243 affect?

CVE-2026-31243 affects mem0. Severity is medium (CVSS 6.5). The mem0 1.0.0 server lacks authentication and authorization controls for its memory reset and table re-creation functionality accessible via the DELETE /memories endpoint. An unauthenticated attacker can send a DELETE request that triggers

How urgent is CVE-2026-31243?

Priority 36/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-31242 CRITICAL 9.1 DOWNGRADE The mem0 v1.0.0 server lacks authentication and authorization controls for its memory reset functionality acce
CVE-2026-31241 MEDIUM 6.5 DOWNGRADE The mem0 1.0.0 server lacks authentication and authorization controls for its memory deletion API endpoint (DE
CVE-2026-31244 MEDIUM 6.5 DOWNGRADE The mem0 1.0.0 server lacks authentication and authorization controls for its memory deletion API endpoint (DE
CVE-2026-31245 MEDIUM 5.3 DOWNGRADE The mem0 1.0.0 server lacks authentication and authorization controls for its memory creation API endpoint (PO

References

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