CVE-2026-52794Network attack vector

Event-ingestion disruption via backtracking hostname regex

Published Jun 24, 2026 · Updated Jun 24, 2026

ReDoS in Sentry 24.4.0 through 26.5.1 allows remote attackers to degrade event ingestion with crafted hostname-like fields. The hostname parameterization regex in src/sentry/grouping/parameterization.py performs extensive backtracking on specially structured event values; the patch bounds segment repetition and moves top-level-domain validation into an O(1) set lookup. A small unauthenticated burst through a publicly exposed project DSN consumes taskworker CPU and reduces throughput for unrelated projects sharing the worker pool.

CVSS severity7.5
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ReDoS in Sentry 24.4.0 through 26.5.1 allows remote attackers to degrade event ingestion with crafted hostname-like fields. The hostname parameterization regex in src/sentry/grouping/parameterization.py performs extensive backtracking on specially structured event values; the patch bounds segment repetition and moves top-level-domain validation into an O(1) set lookup. A small unauthenticated burst through a publicly exposed project DSN consumes taskworker CPU and reduces throughput for unrelated projects sharing the worker pool.

The record

CVE
CVE-2026-52794
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
Sentry
Product
Sentry
Classifications
CWE-1333, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 24.4.0, < 26.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sentry · Sentryversion=>= 24.4.0, < 26.5.2

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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