CVE-2026-63452Network attack vector

Monitoring disruption via repeated Brotli decompression

Published Sep 18, 2026 · Updated Sep 18, 2026

Resource exhaustion in Suricata 8.0.0 through 8.0.5 allows remote attackers to degrade packet processing with crafted HTTP/1 traffic. The rust/htp parser limits decompression work per transaction but repeatedly decompresses small Brotli bombs because it lacks a per-flow bomb-count limit. The response-body-decompress-layer-limit setting must be enabled, and sustained processing can interrupt monitoring or cause denial of service.

CVSS severity7.5
High
EPSS probability0.63%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Suricata 8.0.0 through 8.0.5 allows remote attackers to degrade packet processing with crafted HTTP/1 traffic. The rust/htp parser limits decompression work per transaction but repeatedly decompresses small Brotli bombs because it lacks a per-flow bomb-count limit. The response-body-decompress-layer-limit setting must be enabled, and sustained processing can interrupt monitoring or cause denial of service.

The record

CVE
CVE-2026-63452
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Open Information Security Foundation
Product
Suricata
Classifications
CWE-409, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=>= 8.0.0, < 8.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Information Security Foundation · Suricataversion=>= 8.0.0, < 8.0.6

Published CVSS scores

7.5GitHubCVSS: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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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