CVE-2026-103921
GraphQL Tools: TLS Certificate Validation Disabled in Legacy GraphQL WebSocket Executor
Reported by github_m · Published October 1, 2026
@graphql-tools/executor-legacy-ws is fixed in 1.1.35 (npm)
GraphQL Tools provides utilities for building, stitching, and mocking GraphQL schemas. Prior to 1.1.35, the executor-legacy-ws buildWSLegacyExecutor() function hardcodes TLS certificate rejection off for Node.js connections to wss:// endpoints. Applications using the executor directly, or url-loader with SubscriptionProtocol.LEGACY_WS, can therefore accept an attacker-controlled certificate when a network-positioned attacker intercepts the connection. Authentication material in connectionParams or headers can be disclosed, and subscription data can be modified. Browser WebSocket clients are unaffected because browsers enforce certificate validation. This issue is fixed in version 1.1.35.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| @graphql-tools/executor-legacy-ws | npm | 1.1.35 |
| gitlab-rails-ce-fips-19.3 | Chainguard | 19.3.3-r8 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| ardatan | graphql-tools | < 1.1.35 |
| @graphql-tools | executor-legacy-ws | < 1.1.35 |
| chainguard | gitlab-rails-ce-fips-19.3 | 0 |
| graphql-tools | executor-legacy-ws | 0 |
| @graphql-tools | executor-legacy-ws | 0 |
| chainguard | commercial-gitlab-rails-ee-19.4 | 0 |
| chainguard | commercial-gitlab-rails-ee-fips-19.1 | 0 |
| chainguard | gitlab-rails-ce-19.2 | 0 |
| chainguard | gitlab-rails-ce-fips-19.0 | 0 |
| chainguard | gitlab-rails-ce-fips-19.4 | 0 |
| chainguard | commercial-gitlab-rails-ee-19.2 | 0 |
| chainguard | gitlab-rails-ce-fips-18.9 | 0 |
| chainguard | commercial-gitlab-rails-ee-19.3 | 0 |
| chainguard | gitlab-rails-ce-19.4 | 0 |
| chainguard | gitlab-rails-ce-fips-18.11 | 0 |
| ardatan | graphql-tools | 0 |
| chainguard | commercial-gitlab-rails-ee-fips-19.2 | 0 |
| chainguard | gitlab-rails-ce-fips-18.10 | 0 |
| chainguard | commercial-gitlab-rails-ee-fips-19.4 | 0 |
| chainguard | gitlab-rails-ce-19.3 | 0 |
…and 3 more
Timeline
- Oct 1, 2026 CVE Published
- Oct 1, 2026 CVE Updated
- Oct 2, 2026 EPSS Score (9 in total, the first dated here)
- Oct 30, 2026 Security Advisory
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-103921
vulnetix vdb fixes CVE-2026-103921Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-103921/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- https://github.com/ardatan/graphql-tools/security/advisories/GHSA-6fw5-9hq8-w87g x_refsource_CONFIRM
- https://github.com/ardatan/graphql-tools/pull/8426 x_refsource_MISC
- https://github.com/ardatan/graphql-tools/commit/3831a0661514c91d99971052f983552556880402 x_refsource_MISC
- https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/executor-legacy-ws@1.1.35 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-103921 advisory
- https://github.com/advisories/GHSA-6fw5-9hq8-w87g advisory