SurrealDB before 2.3.6 deny-net Bypass via DNS Resolution

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

SurrealDB before 2.2.6, 2.3.6, and 2.1.8 (and 3.0.0-alpha.7 and earlier) fails to validate DNS-resolved hostnames against --deny-net network access restrictions in its http::* functions. An authenticated user can invoke http::<fn>(<url>) with a hostname that resolves to a denied IP address, causing the server to issue the request anyway and return the response. This bypasses network access controls, allowing access to restricted internal endpoints and potentially retrieving or altering sensitive information and credentials, depending on the deployment.

Source published

18 Jul 2026 13:10:10 UTC

Source modified

28 Jul 2026 01:48:14 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 4.0 · 5.8 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:H/SI:H/SA:H

SurrealDB before 2.2.6, 2.3.6, and 2.1.8 (and 3.0.0-alpha.7 and earlier) fails to validate DNS-resolved hostnames against --deny-net network access restrictions in its http::* functions. An authenticated user can invoke http::<fn>(<url>) with a hostname that resolves to a denied IP address, causing the server to issue the request anyway and return the response. This bypasses network access controls, allowing access to restricted internal endpoints and potentially retrieving or altering sensitive information and credentials, depending on the deployment.

Source published

Jul 18, 2026, 1:10:10 PM (timezone not stated)

Source modified

Jul 28, 2026, 1:48:14 AM (timezone not stated)

Observed here

11 Nov 2026 04:37:33 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 4.0 · 5.8 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:H/SI:H/SA:H

SurrealDB before 2.2.6, 2.3.6, and 2.1.8 (and 3.0.0-alpha.7 and earlier) fails to validate DNS-resolved hostnames against --deny-net network access restrictions in its http::* functions. An authenticated user can invoke http::<fn>(<url>) with a hostname that resolves to a denied IP address, causing the server to issue the request anyway and return the response. This bypasses network access controls, allowing access to restricted internal endpoints and potentially retrieving or altering sensitive information and credentials, depending on the deployment.

Source published

18 Jul 2026 14:17:10 UTC

Source modified

29 Sep 2026 19:10:00 UTC

Observed here

25 Oct 2026 04:17:18 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 5.8 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:H/SI:H/SA:H/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 · [email protected] · Primary · 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SurrealDB offers http functions that can access external network endpoints. A typical, albeit [not recommended ](https://surrealdb.com/docs/surrealdb/reference-guide/security-best-practices#example-deny-all-capabilities-with-some-exceptions)configuration would be to start SurrealDB with all network connections allowed with the exception of a deny list. For example, `surreal start --allow-net --deny-net 10.0.0.0/8` will allow all network connections except to the 10.0.0.0/8 block. An authenticated user of SurrealDB can use bypass this restriction, using `http::<fn>(<url>)` functions where the hostname resolves to an IP within the `--deny-net` block. For example if a SurrealDB administrator wanted to restrict access to other services within a private network and thus set the `--deny-net` to a network IP range, this could be circumvented by an attacker leveraging DNS records and hostname resolution. When sending SurrealDB statements containing the `http::*` functions, if the hostname resolves to a forbidden IP, the SurrealDB server will still issue the request and return the responses to the attacker. ### Impact The impact of this vulnerability is circumvention of the `--deny-net` capability and resulting impact on systems external to SurrealDB. The ultimate impact is dependent on the deployment scenario. For example, if the SurrealDB server blocks requests to internal/private IP addresses because those services don’t require authentication, but an attacker can still use SurrealDBs ability to resolve their hostnames via DNS and invoke them directly using `http::<fn>(<url>)`, the attacker can access these internal endpoints directly, and potentially retrieve or even alter sensitive information and credentials. ### Patches A patch has been created that checks resolved hostnames against allowed network targets, preventing `http::*` functions from connecting to disallowed IPs. - Versions 2.2.6, 2.3.6 and later are not affected by this issue. - The first release following 2.1.7 and 3.0.0-alpha.7 and later will not be affected by this issue ### Workarounds The possibility of this vulnerability being exploited can be reduced by following an allowlist approach to enabling the http capability surreal start `--allow-net 10.0.0.0/8` or using the equivalent `SURREAL_CAPS_ALLOW_NET` environment variable, where endpoints allowed are fully trusted and are not controlled by regular users. Alternatively, the network access capability can be disabled, using `--deny-net` or the equivalent `SURREAL_CAPS_DENY_NET` environment variable without specifying targets, which disables all outbound HTTP, with impact to SurrealDB functionality. As the impact of this vulnerability depends on the security of the deployment environment of SurrealDB, best practices should be followed within that environment.

Source published

4 Sep 2026 17:30:45 UTC

Source modified

4 Sep 2026 17:45:04 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:H/SI:H/SA:H

Publisher rating · MODERATE

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-m3c3-78fh-w3w7. This link is maintained to preserve external references. ## Original Description SurrealDB before 2.2.6, 2.3.6, and 2.1.8 (and 3.0.0-alpha.7 and earlier) fails to validate DNS-resolved hostnames against --deny-net network access restrictions in its http::* functions. An authenticated user can invoke http::<fn>(<url>) with a hostname that resolves to a denied IP address, causing the server to issue the request anyway and return the response. This bypasses network access controls, allowing access to restricted internal endpoints and potentially retrieving or altering sensitive information and credentials, depending on the deployment.

Source published

18 Jul 2026 15:31:49 UTC

Source modified

4 Sep 2026 17:45:04 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:H/SI:H/SA:H/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

Publisher rating · MODERATE