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Full vulnerability report · 2026
CVE-2026-44545High confidence

Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service

djangoproject · daphne

5.3MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archivepython-daphneUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-44545 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitydaphne: daphne: Denial of Service via excessive WebSocket message size
32 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • python3.12-daphne-0:4.2.2-1.el8ap.noarch as a component of Red Hat Ansible Automation Platform 2.5 for RHEL 8
  • python3.12-daphne-0:4.2.2-1.el8ap.src as a component of Red Hat Ansible Automation Platform 2.5 for RHEL 8
  • python3.12-daphne-0:4.2.2-1.el9ap.noarch as a component of Red Hat Ansible Automation Platform 2.5 for RHEL 9
  • python3.12-daphne-0:4.2.2-1.el9ap.src as a component of Red Hat Ansible Automation Platform 2.5 for RHEL 9
  • automation-controller-venv-tower-0:4.7.16-1.el9ap.aarch64 as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • automation-controller-venv-tower-0:4.7.16-1.el9ap.ppc64le as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • automation-controller-venv-tower-0:4.7.16-1.el9ap.s390x as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • automation-controller-venv-tower-0:4.7.16-1.el9ap.x86_64 as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • python3.12-daphne-0:4.2.2-1.el9ap.noarch as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • python3.12-daphne-0:4.2.2-1.el9ap.src as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • registry.redhat.io/ansible-automation-platform-25/lightspeed-rhel8@sha256:533ab1f845bb6be19df79e7209a08b911aaa2fbda2085e170675e9a1e5f7d14d_s390x as a component of Red Hat Ansible Automation Platform 2.5
  • registry.redhat.io/ansible-automation-platform-25/lightspeed-rhel8@sha256:5c100edf885e49a0c1f9972670ec1f939f4a9bef7a5f3bb32b016fa218a516a8_amd64 as a component of Red Hat Ansible Automation Platform 2.5
Summary
A flaw was found in daphne. An unauthenticated remote attacker could exploit this vulnerability by sending arbitrarily large WebSocket messages or frames. This oversight in payload size handling can lead to excessive memory consumption, resulting in a denial of service (DoS) for the affected system.
Remediation
For details on how to apply this update, refer to Ansible Automation Platform documentation.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-34091

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory. Because Autobahn defaults both values to 0 (unlimited), an unauthenticated remote attacker could send arbitrarily large WebSocket messages or frames, causing excessive memory consumption and a denial of service.

What

daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory. Because Autobahn defaults both values to 0 (unlimited), an unauthenticated remote attacker could send arbitrarily large WebSocket messages or frames, causing excessive memory consumption and a denial of service.

Why

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory. Because Autobahn defaults both values to 0 (unlimited), an unauthenticated remote attacker could send arbitrarily large WebSocket messages or frames, causing excessive memory consumption and a denial of service.

Why

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Allocation of Resources Without Limits or Throttling → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-770 ↗

CWE-770: Allocation of Resources Without Limits or Throttling. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-770
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
4.2.0 ≤ 4.2.1
Fixed
python3.12-daphne-0:4.2.2-1.el8ap.noarch as a component of Red Hat Ansible Automation Platform 2.5 for RHEL 8; python3.12-daphne-0:4.2.2-1.el8ap.src as a component of Red Hat Ansible Automation Platform 2.5 for RHEL 8; python3.12-daphne-0:4.2.2-1.el9ap.noarch as a component of Red Hat Ansible Automation Platform 2.5 for RHEL 9; python3.12-daphne-0:4.2.2-1.el9ap.src as a component of Red Hat Ansible Automation Platform 2.5 for RHEL 9; automation-controller-venv-tower-0:4.7.16-1.el9ap.aarch64 as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9; automation-controller-venv-tower-0:4.7.16-1.el9ap.ppc64le as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9; automation-controller-venv-tower-0:4.7.16-1.el9ap.s390x as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9; automation-controller-venv-tower-0:4.7.16-1.el9ap.x86_64 as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9; python3.12-daphne-0:4.2.2-1.el9ap.noarch as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9; python3.12-daphne-0:4.2.2-1.el9ap.src as a component of Red Hat Ansible Automation Platform 2.6 for RHEL 9; registry.redhat.io/ansible-automation-platform-25/lightspeed-rhel8@sha256:533ab1f845bb6be19df79e7209a08b911aaa2fbda2085e170675e9a1e5f7d14d_s390x as a component of Red Hat Ansible Automation Platform 2.5; registry.redhat.io/ansible-automation-platform-25/lightspeed-rhel8@sha256:5c100edf885e49a0c1f9972670ec1f939f4a9bef7a5f3bb32b016fa218a516a8_amd64 as a component of Red Hat Ansible Automation Platform 2.5; registry.redhat.io/ansible-automation-platform-25/lightspeed-rhel8@sha256:76d5b9577000afe0c7e7a7d9c424ca48e2c79a3f638e766a386685379cb93af8_ppc64le as a component of Red Hat Ansible Automation Platform 2.5; registry.redhat.io/ansible-automation-platform-25/lightspeed-rhel8@sha256:801396a430151cdf7409bd606e7031d0d7da4983e08c4cfb5ff172344bbaafdc_arm64 as a component of Red Hat Ansible Automation Platform 2.5; registry.redhat.io/ansible-automation-platform-26/controller-rhel9@sha256:155885f184ad475c5a0a1f00b04fe4faacb3fa6f790e664384ee4e744fcac5f3_amd64 as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/controller-rhel9@sha256:3f3f70bed536434e03c7034ae3cc59c4e57e400fd2d820c4b4efb21657d0b1b3_arm64 as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/controller-rhel9@sha256:836b741f4c2bfe73deb7a7bf90eed048938b0315527bd3768ca5192dd3828cd1_s390x as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/controller-rhel9@sha256:e8b56c816998bf417d58d7585dfb8d9b872db450884bea471de9cdf71033bab5_ppc64le as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/eda-controller-rhel9@sha256:38f097e4920d4e64c8b8839fcc353f4ff32e607719b5e36f23e208bc70d75b59_arm64 as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/eda-controller-rhel9@sha256:464caa10ae549dff7824e330f9d5e7e10aacf7b9ee056a6b4aa2768953c94fd8_s390x as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/eda-controller-rhel9@sha256:9c7fea42d26e687c017aa573fa13b01ee738c88fe11e55317430e4e8b66d339c_amd64 as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/eda-controller-rhel9@sha256:d0a2f84070918986561679893a78e6da279f7680fb7c00bddcc518974ba1e39c_ppc64le as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/lightspeed-rhel9@sha256:544021b673fcef3bfe5291e0e82ed387d93735b52c983cd7b8b15779f4676ac1_amd64 as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/lightspeed-rhel9@sha256:d0230cc8ceaa4a82381b566d3661a49567f62c47ec8da11e8c96550e30bcb88f_arm64 as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/lightspeed-rhel9@sha256:d1246fb6fa7ff8221d88c00d73fa59ccfdc09eb3260af45adc8ddf568c5a0398_s390x as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-26/lightspeed-rhel9@sha256:f5c7dd391581c2549b57ea4a5f61133221d19951ac45ff10952bc26048b71975_ppc64le as a component of Red Hat Ansible Automation Platform 2.6; registry.redhat.io/ansible-automation-platform-27/controller-rhel9@sha256:1671d67b8e2b4d3b4ceb6c5b2bf5e008c7eacf6390745113b85709bc303aed4b_arm64 as a component of Red Hat Ansible Automation Platform 2.7; registry.redhat.io/ansible-automation-platform-27/controller-rhel9@sha256:e94b1dd9ac4dbad9658318b86eabb37b1433a65a3ef829c35411552ccdf98f09_amd64 as a component of Red Hat Ansible Automation Platform 2.7; registry.redhat.io/ansible-automation-platform-27/eda-controller-rhel9@sha256:0e5b8ea19aaf599851b6d3c33f157fed70d6889c21f3b7dda42cc0aaee45e40a_arm64 as a component of Red Hat Ansible Automation Platform 2.7; registry.redhat.io/ansible-automation-platform-27/eda-controller-rhel9@sha256:665bc156c655ca4ed0021bffbabb1d2c7d0a5541582ea63287fcf7d2c3bbf89c_amd64 as a component of Red Hat Ansible Automation Platform 2.7; and 2 more
Action
For details on how to apply this update, refer to Ansible Automation Platform documentation.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 3 Jun 2026 · Last source change 3 Jun 2026, 15:48 UTC · CWE-770 · Allocation of Resources Without Limits or Throttling

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-34091
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-34091↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-44545 · cve.blacktree.nl