Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service
Published Jun 3, 2026
7.5
HIGHCVSS 3.1
EPSS 0.57%
Description
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.
Affected products
-
- Version 4.2.0StatusaffectedConstraints<=4.2.1
- Version 4.2.2StatusunaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Djangoproject | Daphne | unaffected |
|
- < 4.2.2
No data.
Red Hat Ansible Automation Platform 2.5
ansible-automation-platform-25/lightspeed-rhel8:1785430174
Fixed · RHSA-2026:50357
Red Hat Ansible Automation Platform 2.5 for RHEL 8
python3.12-daphne-0:4.2.2-1.el8ap
Fixed · RHSA-2026:50319
Red Hat Ansible Automation Platform 2.5 for RHEL 9
python3.12-daphne-0:4.2.2-1.el9ap
Fixed · RHSA-2026:50319
Red Hat Ansible Automation Platform 2.6
ansible-automation-platform-26/controller-rhel9:1787244009
Fixed · RHSA-2026:59155
Red Hat Ansible Automation Platform 2.6
ansible-automation-platform-26/eda-controller-rhel9:1785633038
Fixed · RHSA-2026:50479
Red Hat Ansible Automation Platform 2.6
ansible-automation-platform-26/lightspeed-rhel9:1785775360
Fixed · RHSA-2026:50479
Red Hat Ansible Automation Platform 2.6 for RHEL 9
automation-controller-0:4.7.16-1.el9ap
Fixed · RHSA-2026:59136
Red Hat Ansible Automation Platform 2.6 for RHEL 9
python3.12-daphne-0:4.2.2-1.el9ap
Fixed · RHSA-2026:50336
Red Hat Ansible Automation Platform 2.7
ansible-automation-platform-27/controller-rhel9:1787220257
Fixed · RHSA-2026:59153
Red Hat Ansible Automation Platform 2.7
ansible-automation-platform-27/eda-controller-rhel9:1785374869
Fixed · RHSA-2026:50340
Red Hat Ansible Automation Platform 2.7
ansible-automation-platform-27/lightspeed-rhel9:1785375273
Fixed · RHSA-2026:50340
Red Hat Ansible Automation Platform 2
python-daphne
Not affected
Red Hat Ansible Automation Platform 2
python3.11-daphne
Not affected
Red Hat Ansible Automation Platform 2
python3x-daphne
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Ansible Automation Platform 2.5 | ansible-automation-platform-25/lightspeed-rhel8:1785430174 | Fixed | RHSA-2026:50357 |
| Red Hat Ansible Automation Platform 2.5 for RHEL 8 | python3.12-daphne-0:4.2.2-1.el8ap | Fixed | RHSA-2026:50319 |
| Red Hat Ansible Automation Platform 2.5 for RHEL 9 | python3.12-daphne-0:4.2.2-1.el9ap | Fixed | RHSA-2026:50319 |
| Red Hat Ansible Automation Platform 2.6 | ansible-automation-platform-26/controller-rhel9:1787244009 | Fixed | RHSA-2026:59155 |
| Red Hat Ansible Automation Platform 2.6 | ansible-automation-platform-26/eda-controller-rhel9:1785633038 | Fixed | RHSA-2026:50479 |
| Red Hat Ansible Automation Platform 2.6 | ansible-automation-platform-26/lightspeed-rhel9:1785775360 | Fixed | RHSA-2026:50479 |
| Red Hat Ansible Automation Platform 2.6 for RHEL 9 | automation-controller-0:4.7.16-1.el9ap | Fixed | RHSA-2026:59136 |
| Red Hat Ansible Automation Platform 2.6 for RHEL 9 | python3.12-daphne-0:4.2.2-1.el9ap | Fixed | RHSA-2026:50336 |
| Red Hat Ansible Automation Platform 2.7 | ansible-automation-platform-27/controller-rhel9:1787220257 | Fixed | RHSA-2026:59153 |
| Red Hat Ansible Automation Platform 2.7 | ansible-automation-platform-27/eda-controller-rhel9:1785374869 | Fixed | RHSA-2026:50340 |
| Red Hat Ansible Automation Platform 2.7 | ansible-automation-platform-27/lightspeed-rhel9:1785375273 | Fixed | RHSA-2026:50340 |
| Red Hat Ansible Automation Platform 2 | python-daphne | Not affected | n/a |
| Red Hat Ansible Automation Platform 2 | python3.11-daphne | Not affected | n/a |
| Red Hat Ansible Automation Platform 2 | python3x-daphne | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (GHSA) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Jun 3, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Jun–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.57% (0.00573) | 45.42th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.30% (0.00303) | 21.68th | v5 (v2026.06.15) |
| Jun 4, 2026 | 0.07% (0.00073) | 22.24th | v4 (v2025.03.14) |
References (7)
- https://access.redhat.com/security/cve/CVE-2026-44545 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2484377 Issue Tracking
- https://github.com/advisories/GHSA-rrc9-mx66-ffcm Advisory
- https://github.com/django/daphne/blob/main/CHANGELOG.txt release-notesRelease Notes
- https://github.com/pypa/advisory-database/tree/main/vulns/daphne/PYSEC-2026-213.yaml
- https://nvd.nist.gov/vuln/detail/CVE-2026-44545
- https://www.cve.org/CVERecord?id=CVE-2026-44545
Change history (0)
No recorded changes yet.