TCP backend stream ID overflow
Published Apr 22, 2026
6.5
MEDIUMCVSS 3.1
EPSS 0.39%
Description
A client might theoretically be able to cause a mismatch between queries sent to a backend and the received responses by sending a flood of perfectly timed queries that are routed to a TCP-only or DNS over TLS backend.
Affected products
-
- Version 1.9.0StatusaffectedConstraints<1.9.13
- Version 2.0.0StatusaffectedConstraints<2.0.4
- Version
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (CVE.org) ▾
CVSS:3.1/AV:A/AC:H/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
NoTechnical Impact
PartialDecision
n/aAssessed Apr 22, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Apr–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 2, 2026 | 0.39% (0.00390) | 30.71th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.17% (0.00169) | 6.57th | v5 (v2026.06.15) |
| Apr 23, 2026 | 0.01% (0.00005) | 0.28th | v4 (v2025.03.14) |
References (1)
- https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html Vendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html | Vendor Advisory |
Change history (0)
No recorded changes yet.