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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-24 · updated 2026-10-25
Weakness: CWE-1333

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.

Affected products

getsentry sentry: from 24.4.0 before 26.5.2 — fixed in 26.5.2

How to fix

Upgrade to a fixed version: getsentry sentry 26.5.2. Check the vendor advisory for mitigations.

References

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

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