PubNub Outage History

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PubNub had 14 outages in the last 2 years totaling 17h 39m of downtime — averaging 0.6 incidents per month.

There were 14 PubNub outages since July 22, 2025 totaling 17h 39m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: http://status.pubnub.com

Minor November 20, 2025

Increased errors observed and resolved

Detected by Pingoru
Nov 20, 2025, 04:30 PM UTC
Resolved
Nov 20, 2025, 04:30 PM UTC
Duration
—
Timeline · 2 updates
  1. resolved Nov 20, 2025, 05:36 PM UTC

    Increased errors (5XX) observed On Nov. 20, 2025 between 16:36 UTC and 16:48 UTC, publish and replication errors (5xx) were observed in North American and Asia Pacific regions, and immediately resolved. Please contact [email protected] if you believe you were impacted by the issue and would like to discuss it with our team.

  2. postmortem Nov 25, 2025, 01:05 AM UTC

    **Problem Description, Impact, and Resolution** Starting at 16:46 UTC on Nov. 20, 2025, we noticed a small number of errors with the publish API in the North American and Asia Pacific regions. The system automatically recovered with all functionality fully restored by 16:50 UTC on Nov. 20, 2025.

Read the full incident report →

Notice September 7, 2025

Increased Error Rate and Latency for Presence

Detected by Pingoru
Sep 07, 2025, 06:45 PM UTC
Resolved
Sep 07, 2025, 07:02 PM UTC
Duration
17m
Affected: Presence Service
Timeline · 3 updates
  1. monitoring Sep 07, 2025, 06:45 PM UTC

    We experienced increased latencies and error rates in our Tokyo, San Jose, and Virginia points-of-presence from 18:14 - 18:17 UTC. A fix was deployed and we are monitoring the situation.

  2. resolved Sep 07, 2025, 07:02 PM UTC

    The issues affected the Presence service from 18:14 - 18:17 UTC. We will follow up with a post-mortem soon. We apologize for the impact this may have had on your service. Please reach out to us by contacting PubNub Support ([email protected]) if you wish to discuss the impact on your service.

  3. postmortem Sep 12, 2025, 11:19 PM UTC

    ### **Problem Description, Impact, and Resolution** At 18:14 UTC on September 7, 2025 we observed increased error rates and latency for our Presence service in our San Jose, Virginia, and Tokyo regions. We increased capacity in those regions and the issue was resolved at 18:17 UTC. This issue was a recurrence of the issue [experienced on September 2, 2025](https://status.pubnub.com/incidents/1n8xk6w5y9lk), where a bug in one of our APIs allowed a request to execute an operation that exceeded assumed limits in extreme cases, causing out-of-memory conditions for the Presence service. ### **Mitigation Steps and Recommended Future Preventative Measures** In the previous instance of this issue, we placed restrictions on the API in question; those changes were not restrictive enough, which allowed for this recurrence. We have corrected that oversight, as well as increased memory capacities in this area of our system as an additional safeguard.

Read the full incident report →

Notice September 2, 2025

Presence is experiencing elevated latencies and error rates

Detected by Pingoru
Sep 02, 2025, 06:34 PM UTC
Resolved
Sep 02, 2025, 06:50 PM UTC
Duration
16m
Affected: North America Points of PresenceAsia Pacific Points of PresencePresence Service
Timeline · 3 updates
  1. monitoring Sep 02, 2025, 06:34 PM UTC

    At about 11:09, the Presence began to experience elevated latencies and error rates. PubNub Technical Staff is investigating and more information will be posted as it becomes available. If you are experiencing issues that you believe to be related to this incident, please report the details to PubNub Support ([email protected]).

  2. resolved Sep 02, 2025, 06:50 PM UTC

    The issues affected the Presence service from 18:08 to 18:16 UTC. We will follow up with a post-mortem soon. We apologize for the impact this may have had on your service. Please reach out to us by contacting PubNub Support ([email protected]) if you wish to discuss the impact on your service.

  3. postmortem Sep 05, 2025, 10:27 PM UTC

    ### **Problem Description, Impact, and Resolution** At 18:09 UTC on September 2, 2025 we observed increased error rates and latency for our Presence service in our San Jose, Virginia, and Tokyo regions. We increased capacity in those regions and the issue was resolved at 18:16 UTC. This issue occurred because a bug in one of our APIs allowed a request to execute an operation that exceeded assumed limits in extreme cases. In this case, a large number of such requests were executed that resulted in out-of-memory conditions for the Presence service. ### **Mitigation Steps and Recommended Future Preventative Measures** To prevent a similar issue from occurring in the future we have enforced the intended limit on the API in question. We have also added additional testing and monitoring in this area.

Read the full incident report →