5.9

CVE-2026-52690: powerdns recursor Authentication Bypass by Spoofing

CVSS: 5.9v3.1MediumDeferred
AliasesUBUNTU-CVE-2026-52690DEBIAN-CVE-2026-52690
Published 25-06-2026Last modified 25-06-2026
Open JSON

Vulnerability summary

CVE-2026-52690 is a medium (CVSS 5.9) Authentication Bypass by Spoofing vulnerability in powerdns recursor. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.6% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.43%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 25-06-2026
    PublishedVulnerability first disclosed.
  2. 25-06-2026
    Last modifiedVulnerability information updated.

Description

Spoofing replies to Recursor might mark an IP of an authoritative server as not supporting EDNS, causing valdiation of DNSSEC records served by that server to fail.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

+0.09 pp

From 0.34% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.43%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • pdns-recursorAll versions (No fix recorded) | < 5.2.11-0+deb13u1 | < 5.4.3-1
Powerdns1 product
  • recursor≥ 5.2.0, < 5.2.11 | ≥ 5.3.0, < 5.3.8 | ≥ 5.4.0, < 5.4.3
Ubuntu1 product
  • pdns-recursorAll versions (No fix recorded)

3 vendors · 3 products

References

5 links