Bun fixes MongoDB TLS memory spike

// 50d agoPRODUCT UPDATE

Bun fixes MongoDB TLS memory spike

Bun is reporting a fix for a longstanding memory-usage issue that shows up when apps use Mongoose or the MongoDB driver over TLS. The bug caused excessive peak memory growth in affected workloads, and the team says the fix will ship in the next Bun version.

// ANALYSIS

Hot take: this is a practical production-stability fix, not a flashy feature, and it matters because memory cliffs are the kind of bug that make teams abandon a runtime.

–The issue appears to affect real backend workloads using MongoDB over TLS, especially with Mongoose in the stack.
–The announcement frames this as a Bun-runtime fix, which suggests the root cause was below the app layer rather than in Mongoose itself.
–If the fix holds up in release, it removes a meaningful blocker for Bun adoption in services that talk to secured MongoDB deployments.

// TAGS

bunmongodbmongoosetlsdebuggingdevtoolobservabilityruntimebugfixbackend

DISCOVERED

50d ago

2026-05-02

PUBLISHED

50d ago

2026-05-02

RELEVANCE

8/ 10

AUTHOR

bunjavascript

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Bun fixes MongoDB TLS memory spike