CVE-2026-33602

Off-by-one access when processing crafted UDP responses

HIGH
8.2
CVSS Score
Published: April 22, 2026 at 01:45 PM UTC
Updated: October 26, 2026 at 09:10 PM UTC
2 products affected across 1 vendorDNSdistAuthoritative

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Severity
HIGH8.2
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

1.9.0 ≤ v < 1.9.132.0.0 ≤ v < 2.0.41.9.02.0.0
Affected range stops below 1.9.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-122

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