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Vulnerability Details :

CVE-2026-32792

Summary
Assigner-NLnet Labs
Assigner Org ID-206fc3a0-e175-490b-9eaa-a5738056c9f6
Published At-20 May, 2026 | 09:17
Updated At-20 May, 2026 | 12:16
Rejected At-
Credits

Packet of death with DNSCrypt

NLnet Labs Unbound 1.6.2 up to and including version 1.25.0 has a denial of service vulnerability when compiled with DNSCrypt support ('--enable-dnscrypt'). A bad DNSCrypt query could underflow Unbound's DNSCrypt packet reading procedure that may lead to heap overflow. A malicious actor can exploit the vulnerability with a single bad DNSCrypt query that its decrypted plaintext consists entirely of '0x00' bytes and does not contain the expected '0x80' marker. Unbound would then start reading more bytes than necessary until it finds a non-'0x00' byte. Based on the underlying memory allocator and the memory layout, it could lead to heap overflow while reading followed by a crash. Likelihood of a crash is low, since it relies heavily on the underlying memory allocator and the memory layout. If the heap overflow does not happen, Unbound's later packet checks will deny the packet. Unbound 1.25.1 contains a patch with a fix to bound reading in the given buffer space.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:NLnet Labs
Assigner Org ID:206fc3a0-e175-490b-9eaa-a5738056c9f6
Published At:20 May, 2026 | 09:17
Updated At:20 May, 2026 | 12:16
Rejected At:
â–¼CVE Numbering Authority (CNA)
Packet of death with DNSCrypt

NLnet Labs Unbound 1.6.2 up to and including version 1.25.0 has a denial of service vulnerability when compiled with DNSCrypt support ('--enable-dnscrypt'). A bad DNSCrypt query could underflow Unbound's DNSCrypt packet reading procedure that may lead to heap overflow. A malicious actor can exploit the vulnerability with a single bad DNSCrypt query that its decrypted plaintext consists entirely of '0x00' bytes and does not contain the expected '0x80' marker. Unbound would then start reading more bytes than necessary until it finds a non-'0x00' byte. Based on the underlying memory allocator and the memory layout, it could lead to heap overflow while reading followed by a crash. Likelihood of a crash is low, since it relies heavily on the underlying memory allocator and the memory layout. If the heap overflow does not happen, Unbound's later packet checks will deny the packet. Unbound 1.25.1 contains a patch with a fix to bound reading in the given buffer space.

Affected Products
Vendor
NLnet Labs
Product
Unbound
Default Status
unaffected
Versions
Affected
  • From 1.6.2 before 1.25.1 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-166CWE-166: Improper Handling of Missing Special Element
CWECWE-125CWE-125: Out-of-bounds Read
Type: CWE
CWE ID: CWE-166
Description: CWE-166: Improper Handling of Missing Special Element
Type: CWE
CWE ID: CWE-125
Description: CWE-125: Out-of-bounds Read
Metrics
VersionBase scoreBase severityVector
4.04.6MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
Version: 4.0
Base score: 4.6
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

This issue is fixed starting with version 1.25.1

Configurations

Workarounds

Exploits

Credits

finder
Andrew Griffiths (calif.io)
Timeline
EventDate
Issue reported by Andrew Griffiths2026-04-16 00:00:00
NLnet Labs shares patch2026-04-17 00:00:00
Andrew Griffiths verifies patch2026-04-18 00:00:00
Fixes released with version 1.25.12026-05-20 00:00:00
Event: Issue reported by Andrew Griffiths
Date: 2026-04-16 00:00:00
Event: NLnet Labs shares patch
Date: 2026-04-17 00:00:00
Event: Andrew Griffiths verifies patch
Date: 2026-04-18 00:00:00
Event: Fixes released with version 1.25.1
Date: 2026-05-20 00:00:00
Replaced By

Rejected Reason

References
HyperlinkResource
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-32792.txt
vendor-advisory
Hyperlink: https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-32792.txt
Resource:
vendor-advisory
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:sep@nlnetlabs.nl
Published At:20 May, 2026 | 10:16
Updated At:20 May, 2026 | 22:44

NLnet Labs Unbound 1.6.2 up to and including version 1.25.0 has a denial of service vulnerability when compiled with DNSCrypt support ('--enable-dnscrypt'). A bad DNSCrypt query could underflow Unbound's DNSCrypt packet reading procedure that may lead to heap overflow. A malicious actor can exploit the vulnerability with a single bad DNSCrypt query that its decrypted plaintext consists entirely of '0x00' bytes and does not contain the expected '0x80' marker. Unbound would then start reading more bytes than necessary until it finds a non-'0x00' byte. Based on the underlying memory allocator and the memory layout, it could lead to heap overflow while reading followed by a crash. Likelihood of a crash is low, since it relies heavily on the underlying memory allocator and the memory layout. If the heap overflow does not happen, Unbound's later packet checks will deny the packet. Unbound 1.25.1 contains a patch with a fix to bound reading in the given buffer space.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.04.6MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Green
Primary3.15.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Type: Secondary
Version: 4.0
Base score: 4.6
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Green
Type: Primary
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CPE Matches

nlnetlabs
nlnetlabs
>>unbound>>Versions from 1.6.2(inclusive) to 1.25.1(exclusive)
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-125Secondarysep@nlnetlabs.nl
CWE-166Secondarysep@nlnetlabs.nl
CWE ID: CWE-125
Type: Secondary
Source: sep@nlnetlabs.nl
CWE ID: CWE-166
Type: Secondary
Source: sep@nlnetlabs.nl
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-32792.txtsep@nlnetlabs.nl
Mitigation
Vendor Advisory
Hyperlink: https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-32792.txt
Source: sep@nlnetlabs.nl
Resource:
Mitigation
Vendor Advisory

Change History

0
Information is not available yet

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