CVE-2026-63756: SurrealDB versions before 3.1.0 contain a time-of-check/time-of-use race condition in the HTTP /rpc endpoint t

Q: How do I fix CVE-2026-63756?

surrealdb: upgrade to 3.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-63756 being exploited?

CVE-2026-63756 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-63756 affect?

CVE-2026-63756 affects surrealdb. Severity is high (CVSS 8.1). SurrealDB versions before 3.1.0 contain a time-of-check/time-of-use race condition in the HTTP /rpc endpoint that allows unauthenticated requests to inherit authenticated session state. Unauthenticated attackers can send concurrent requests

Q: How urgent is CVE-2026-63756?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.1REMOTEUPGRADE

CVE-2026-63756 is a high-severity flaw (CVSS 8.1) affecting surrealdb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SurrealDB versions before 3.1.0 contain a time-of-check/time-of-use race condition in the HTTP /rpc endpoint that allows unauthenticated requests to inherit authenticated session state. Unauthenticated attackers can send concurrent requests to the /rpc endpoint while legitimate authenticated traffic is active to execute operations with hijacked user privileges.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-362
Published	2026-07-20
Last modified	2026-07-22

Publisher (CNA): VulnCheck · Vendor: surrealdb

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-20 12:19 UTCPublished CVE record published
2026-07-22 15:18 UTCUpdated Record last modified

surrealdb surrealdb UPGRADE

Affected: < 3.1.0

Fixed in: 3.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade surrealdb

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade surrealdb

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-63756?

surrealdb: upgrade to 3.1.0. Exact commands for each OS are on this page.

Is CVE-2026-63756 being exploited?

CVE-2026-63756 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-2026-63756 affect?

CVE-2026-63756 affects surrealdb. Severity is high (CVSS 8.1). SurrealDB versions before 3.1.0 contain a time-of-check/time-of-use race condition in the HTTP /rpc endpoint that allows unauthenticated requests to inherit authenticated session state. Unauthenticated attackers can send concurrent requests

How urgent is CVE-2026-63756?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

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References

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