What’s Vulnerable › Vulnerabilities

CVE-2026-109339: SurrealDB 3.1.0 before 3.3.0 Memory Exhaustion via Surrealism Module Output Buffering

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-16
• Weakness: CWE-770

Description

SurrealDB 3.1.0 before 3.3.0 lets Surrealism modules exhaust server memory because module stdout/stderr lines are buffered unbounded in host memory, bypassing the configured module memory limit. An attacker can run an Owner-installed malicious module that writes output without newlines, crashing the server and denying service to all namespaces and databases.

Affected products

• surrealdb: from 3.1.0 before 3.3.0 — fixed in 3.3.0
• surrealdb surrealism-runtime: from 0.3.0 before 0.6.0 — fixed in 0.6.0

How to fix

Upgrade to a fixed version: surrealdb 3.3.0; surrealdb surrealism-runtime 0.6.0. Check the vendor advisory for mitigations.

References

• https://github.com/surrealdb/surrealdb/security/advisories/GHSA-jj89-wvrw-c4gp
• https://www.vulncheck.com/advisories/surrealdb-3.1.0-before-3.3.0-memory-exhaustion-via-surrealism-module-output-buffering

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