# CVE-2025-71395: SurrealDB memory exhaustion in string::replace function

Source: https://junglewise.ai/threats/cve-2025-71395-surrealdb-memory-exhaustion-in-string-replace-function  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-18. Updated: 2026-07-18  
License: CC BY 4.0 with a link back

CVE-2025-71395 · Severity: medium · CVSS 4 · Published 2026-07-18

SurrealDB is a multi-model database used for managing and querying large-scale data. A vulnerability in its string processing functions allows a logged-in user to crash the database server by running a specially crafted search-and-replace command. This results in a total service outage, preventing all users and applications from accessing the database until it is restarted.

Technologies: [surrealdb (crates.io)](https://junglewise.ai/threats/technologies/surrealdb). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is CVE-2025-71395 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-71395 being exploited in the wild.

**How severe is CVE-2025-71395?** Medium severity, with a CVSS score of 4, published 18 July 2026.

**Which products and versions are affected?** surrealdb (crates.io) SEMVER:introduced=2.2.0,fixed=2.2.2.

**Is there a fix for CVE-2025-71395?** Yes. surrealdb (crates.io): upgrade to 2.2.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-71395 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2025-71395?** Check whether you run surrealdb (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- surrealdb (crates.io): upgrade to 2.2.2 or later

  ```sh
  cargo update -p surrealdb
  ```


## Technical details

A memory exhaustion vulnerability (CWE-789) exists in SurrealDB's 'string::replace' function when processing regular expressions. The root cause is a failure to enforce limits on the length of the resulting string during regex-based replacement operations. An authenticated attacker with network access can execute a malicious SurrealQL query that triggers unbounded memory allocations. This leads to a crash of the SurrealDB instance due to Out-Of-Memory (OOM) conditions. The issue has been patched in versions 2.0.5, 2.1.5, and 2.2.2 by introducing the 'SURREAL_GENERATION_ALLOCATION_LIMIT' to enforce string length constraints.

## Affected products

- SurrealDB SurrealDB < 2.0.5, < 2.1.5, < 2.2.2

## Identifiers

- CVE-2025-71395
- GHSA-3633-g6mg-p6qq

## Timeline

- 2025-04-10: advisory: GitHub Security Advisory published
- 2026-07-18: disclosed: NVD publication date

## References

- [https://github.com/surrealdb/surrealdb/security/advisories/GHSA-3633-g6mg-p6qq](https://github.com/surrealdb/surrealdb/security/advisories/GHSA-3633-g6mg-p6qq)
- [https://www.vulncheck.com/advisories/surrealdb-before-memory-exhaustion-via-string-replace](https://www.vulncheck.com/advisories/surrealdb-before-memory-exhaustion-via-string-replace)

## Related threats

- [SurrealDB use-after-free in KV backends via affinitypool spawn_local](https://junglewise.ai/threats/cve-2026-121417-surrealdb-before-3-3-0-contains-a-use-after-free-vulnerability)
- [SurrealDB JSON parser denial of service via uncontrolled recursion](https://junglewise.ai/threats/surrealdb-json-parser-denial-of-service-via-uncontrolled-recursion-3037f8a0)
- [SurrealDB ES512 algorithm silently downgraded to ES384](https://junglewise.ai/threats/surrealdb-es512-algorithm-silently-downgraded-to-es384-f0af29b8)
- [SurrealDB permission bypass via WHERE clause evaluation](https://junglewise.ai/threats/surrealdb-permission-bypass-via-where-clause-evaluation-afa6f001)
- [SurrealDB authorization bypass in KILL statement](https://junglewise.ai/threats/surrealdb-authorization-bypass-in-kill-statement-fc230d0f)