CVE-2026-63760
SurrealDB before 3.1.0 Denial of Service via JSON Parser
SurrealDB before 3.1.0 fails to enforce the configured recursion depth limit in the value and JSON parser when processing nested braces, brackets, or parentheses. Unauthenticated attackers can send deeply nested JSON payloads to the WebSocket /rpc endpoint to exhaust server memory and crash the process.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
SurrealDB before 3.1.0 Denial of Service via JSON Parser
SurrealDB before 3.1.0 fails to enforce the configured recursion depth limit in the value and JSON parser when processing nested braces, brackets, or parentheses. Unauthenticated attackers can send deeply nested JSON payloads to the WebSocket /rpc endpoint to exhaust server memory and crash the process.
- Record
CVE-2026-63760- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-674
- Updated
- 2026-11-02
EUVDEUVD-2026-45931
SurrealDB before 3.1.0 fails to enforce the configured recursion depth limit in the value and JSON parser when processing nested braces, brackets, or parentheses. Unauthenticated attackers can send deeply nested JSON payloads to the WebSocket /rpc endpoint to exhaust server memory and crash the process.
- Record
EUVD-2026-45931- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-m464-hj36-96vx
Duplicate Advisory: SurrealDB has Denial of Service in JSON parser due to nested objects
Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-q729-696q-g9pq. This link is maintained to preserve external references.
Original Description
SurrealDB before 3.1.0 fails to enforce the configured recursion depth limit in the value and JSON parser when processing nested braces, brackets, or parentheses. Unauthenticated attackers can send deeply nested JSON payloads to the WebSocket /rpc endpoint to exhaust server memory and crash the process.
- Record
GHSA-m464-hj36-96vx- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-674
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-q729-696q-g9pq
SurrealDB has Denial of Service in JSON parser due to nested objects
The SurrealDB value and JSON parser did not enforce the configured recursion depth limit when parsing nested {, [, or ( tokens. The expression parser already enforced the limit for these tokens; the value/JSON parser omitted it. An unauthenticated attacker could send a deeply nested JSON payload to the WebSocket /rpc endpoint and exhaust server memory, crashing the process.
This is an incomplete fix for GHSA-6r8p-hpg7-825g, which addressed the same class of bug in the expression parser but did not cover the value/JSON parser code path.
Impact
An unauthenticated remote attacker can crash a SurrealDB server with a single WebSocket message. No credentials or query execution privileges are required.
Patches
A patch enforces the configured recursion depth limit in parse_value and parse_json, bringing them in line with the rest of the parser.
- Versions 3.1.0 and later are not affected by this issue.
Workarounds
Restrict network access to the WebSocket /rpc endpoint to trusted clients.
- Record
GHSA-q729-696q-g9pq- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-674
- Updated
- 2026-11-02
NVD
SurrealDB before 3.1.0 fails to enforce the configured recursion depth limit in the value and JSON parser when processing nested braces, brackets, or parentheses. Unauthenticated attackers can send deeply nested JSON payloads to the WebSocket /rpc endpoint to exhaust server memory and crash the process.
- Record
CVE-2026-63760- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-674
- Updated
- 2026-11-02
OSV
SurrealDB before 3.1.0 Denial of Service via JSON Parser
SurrealDB before 3.1.0 fails to enforce the configured recursion depth limit in the value and JSON parser when processing nested braces, brackets, or parentheses. Unauthenticated attackers can send deeply nested JSON payloads to the WebSocket /rpc endpoint to exhaust server memory and crash the process.
- Record
CVE-2026-63760- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-674
- Updated
- 2026-11-04
OSVGHSA-m464-hj36-96vx
Duplicate Advisory: SurrealDB has Denial of Service in JSON parser due to nested objects
Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-q729-696q-g9pq. This link is maintained to preserve external references.
Original Description
SurrealDB before 3.1.0 fails to enforce the configured recursion depth limit in the value and JSON parser when processing nested braces, brackets, or parentheses. Unauthenticated attackers can send deeply nested JSON payloads to the WebSocket /rpc endpoint to exhaust server memory and crash the process.
- Record
GHSA-m464-hj36-96vx- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-674
- Updated
- 2026-11-02
OSVGHSA-q729-696q-g9pq
SurrealDB has Denial of Service in JSON parser due to nested objects
The SurrealDB value and JSON parser did not enforce the configured recursion depth limit when parsing nested {, [, or ( tokens. The expression parser already enforced the limit for these tokens; the value/JSON parser omitted it. An unauthenticated attacker could send a deeply nested JSON payload to the WebSocket /rpc endpoint and exhaust server memory, crashing the process.
This is an incomplete fix for GHSA-6r8p-hpg7-825g, which addressed the same class of bug in the expression parser but did not cover the value/JSON parser code path.
Impact
An unauthenticated remote attacker can crash a SurrealDB server with a single WebSocket message. No credentials or query execution privileges are required.
Patches
A patch enforces the configured recursion depth limit in parse_value and parse_json, bringing them in line with the rest of the parser.
- Versions 3.1.0 and later are not affected by this issue.
Workarounds
Restrict network access to the WebSocket /rpc endpoint to trusted clients.
- Record
GHSA-q729-696q-g9pq- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-674
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
surrealdbcrates.io |
before 3.1.0 | 3.1.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts, references | OSV | |
| affected | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-63760 is a high vulnerability (CVSS 8.7) in Surrealdb, published July 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.52%, the 44th percentile. Fixed in surrealdb 3.1.0.
References
github.com/surrealdb/surrealdb/security/advisories/GHSA-q729-696q-g9pq
vulncheck.com/advisories/surrealdb-before-denial-of-service-via-json-parser
nvd.nist.gov/vuln/detail/CVE-2026-63760