Outage in Lever
Nylas Authenticaiton Issue - 500 Error and Email/Calendar Sync Failures
Resolved MajorIncident Report
Summary AI Generated
Lever experienced a Nylas authentication failure affecting customers using on-premise Microsoft Exchange email/calendar services, causing 500 errors when resetting permissions and triggering email loops that sent candidates duplicate emails every 10–15 minutes. The issue stemmed from a bug in Node.js v24.17.0 introduced during a Node 18→24 migration on June 30, which broke socket handling and caused premature connection failures with Nylas. A fix was deployed on July 8, 2026, restoring full email and calendar sync functionality, with the incident fully resolved the following day.
On 7-3-2026 we were made aware of an issue impacting Lever instances with Nylas authentication (generally used for customers with on-premise Microsoft Exchange email/calendar services). Only Nylas authentication is impacted, there has been no similar behavior observed for customers authenticating with Office 365 or Google services.
Users may experience a "500 error" message when attempting to reset email/calendar permissions and we have observed several unexpected email loops causing candidates to receive duplicate emails every 10 to 15 minutes as a result of this issue.
Root cause: The 500s and email failures are caused by a known bug in Node.js v24.17.0 (https://github.com/nodejs/node/issues/63989). The v24.17.0 security release (CVE-2026-48931) changed `http.Agent` keep-alive socket handling so that `node-fetch` throws `ERR_STREAM_PREMATURE_CLOSE` ("Premature close") on gzipped responses to external providers (Nylas/Google). Our services picked it up this bug via the Node 18→24 migration (Occurred on 06-30-2026). The bug was fixed upstream in Node 24.18.0
This issue should be fixed in a deployment today (7-8-2026). We will provide updates on the issue status and deployment timeline as soon as possible.
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Latest Updates ( sorted recent to last )
RESOLVED
12 days ago - at 07/09/2026 04:19PM
This incident is resolved. A Root Cause Analysis (RCA) will be published to this issue within the standard Service Level Agreement.
MONITORING
13 days ago - at 07/08/2026 08:03PM
A fix has been implemented as of approximately 12:15pm PST/PDT on 7/8/2026. Email and Calendar sync are now fully functional for Lever instances configured with Nylas authentication.
We are continuing to monitor the effectiveness of the fix. A Root Cause Analysis (RCA) will be published to this issue within the standard Service Level Agreement.
IDENTIFIED
13 days ago - at 07/08/2026 05:17PM
On 7-3-2026 we were made aware of an issue impacting Lever instances with Nylas authentication (generally used for customers with on-premise Microsoft Exchange email/calendar services). Only Nylas authentication is impacted, there has been no similar behavior observed for customers authenticating with Office 365 or Google services.
Users may experience a "500 error" message when attempting to reset email/calendar permissions and we have observed several unexpected email loops causing candidates to receive duplicate emails every 10 to 15 minutes as a result of this issue.
Root cause: The 500s and email failures are caused by a known bug in Node.js v24.17.0 (https://github.com/nodejs/node/issues/63989). The v24.17.0 security release (CVE-2026-48931) changed `http.Agent` keep-alive socket handling so that `node-fetch` throws `ERR_STREAM_PREMATURE_CLOSE` ("Premature close") on gzipped responses to external providers (Nylas/Google). Our services picked it up this bug via the Node 18→24 migration (Occurred on 06-30-2026). The bug was fixed upstream in Node 24.18.0
This issue should be fixed in a deployment today (7-8-2026). We will provide updates on the issue status and deployment timeline as soon as possible.
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