CVE-2026-45759Network attack vector

Denial of service via quadratic header parsing

Published Sep 10, 2026 · Updated Sep 10, 2026

Uncontrolled resource consumption in Suricata before 7.0.16 and 8.0.0 through 8.0.4 allows remote attackers to interrupt service. During HTTP response body processing, HTTPParseContentDispositionHeader repeatedly reparses large Content-Disposition headers with quadratic cost. Any crafted HTTP traffic traversing an affected sensor can consume excessive CPU, degrading or denying its inspection availability without authentication.

CVSS severity7.5
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Suricata before 7.0.16 and 8.0.0 through 8.0.4 allows remote attackers to interrupt service. During HTTP response body processing, HTTPParseContentDispositionHeader repeatedly reparses large Content-Disposition headers with quadratic cost. Any crafted HTTP traffic traversing an affected sensor can consume excessive CPU, degrading or denying its inspection availability without authentication.

The record

CVE
CVE-2026-45759
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
Open Information Security Foundation
Product
Suricata
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=< 7.0.16
  2. Affected versionversion=>= 8.0.0, < 8.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Information Security Foundation · Suricataversion=< 7.0.16; version=>= 8.0.0, < 8.0.5

Published CVSS scores

7.5OISF GitHub Security AdvisoryCVSS: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.

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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-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

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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