CVE-2026-33602: powerdns dnsdist Heap-based Buffer Overflow
CVSS: 8.2v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-33602DEBIAN-CVE-2026-33602
Published 22-04-2026Last modified 22-04-2026
Vulnerability summary
CVE-2026-33602 is a high (CVSS 8.2) Heap-based Buffer Overflow vulnerability in powerdns dnsdist. EPSS estimates a 1.18% chance of exploitation in the next 30 days, higher than 67.2% of scored vulnerabilities.
CVSS score
8.2/10
010
High · v3.1 (NVD)EPSS score
1.18%
0%100%
Low · +0.45 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 3 · Related 3Timeline
- 22-04-2026PublishedVulnerability first disclosed.
- 22-04-2026Last modifiedVulnerability information updated.
Description
A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value, triggering an out-of-bounds write leading to a denial of service.
CVSS metrics
4 scores · 4 sources · 1 versionHigh 8.2Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:HSources4 sources · 6.5–8.2
- CVE.orgCNA6.5MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- OSV · DebianEcosystem advisory · calculated8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
EPSS trend
Probability
1.18%
Chance of exploitation in the next 30 days
Percentile
67%
Versus all other CVEs
30-day change
+0.45 pp
From 0.73% on 21-09-2026
21-09-202621-10-2026
EPSS score1.18%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- dnsdistAll versions (No fix recorded) | < 1.9.14-0+deb13u1 | < 2.0.4-1
Powerdns1 product
- dnsdist≥ 1.9.0, < 1.9.13 | ≥ 2.0.0, < 2.0.4
Ubuntu1 product
- dnsdistAll versions (No fix recorded)
3 vendors · 3 products
