Medium severity · published Oct 12, 2026
CVE-2026-109338
SurrealDB before 3.3.0 Denial of Service via Headers Non-ASCII Values
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
SurrealDB before 3.3.0 contains a denial of service vulnerability that allows query-capable users to crash the server by reading non-ASCII header values in embedded JavaScript. Attackers with scripting enabled can read such values via Headers get(), entries(), values(), or getSetCookie(), or return them from fetch() endpoints, aborting the server process.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SU
surrealdb · surrealdb
before 3.3.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109338
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109338
vendor-advisory
https://github.com/surrealdb/surrealdb/security/advisories/GHSA-84w9-87hm-mxqx
third-party-advisory
https://www.vulncheck.com/advisories/surrealdb-before-3.3.0-denial-of-service-via-headers-non-ascii-values
More from surrealdb
8.8
CVE-2026-63763
SurrealDB before 2.5.0 Privilege Escalation via Future Fields
8.8
CVE-2026-63757
SurrealDB before 3.1.0 Session Hijacking via /rpc sessions
8.8
CVE-2025-71390
SurrealDB before 2.3.6 deny-net Bypass via DNS Resolution
8.8
CVE-2024-58366
SurrealDB before 1.1.1 Format String via Scripting Functions
8.8
CVE-2024-58362
SurrealDB before 1.5.5 Query Injection via RPC API