CWE-197

Numeric Truncation Error

Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion.

CVE-2026-42944 (GCVE-0-2026-42944)

Vulnerability from cvelistv5 – Published: 2026-05-20 09:20 – Updated: 2026-05-20 13:38
VLAI
Title
Heap overflow with multiple NSID, COOKIE, PADDING EDNS options
Summary
NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options ('nsid', 'answer-cookie', 'pad-responses' (default)) need to be enabled for the vulnerability to be exploited. An adversary who can query Unbound can exploit the vulnerability by attaching multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options to the query. A flaw in the size calculation of the EDNS field truncates the correct value which allows the encoder to overflow the available space when writing. Those two combined lead to a heap overflow write of Unbound controlled data and eventually a crash. Unbound 1.25.1 contains a patch with a fix to de-duplicate the EDNS options and a fix to prevent truncation of the EDNS field size calculation.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Red
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
NLnet Labs Unbound Affected: 1.14.0 , < 1.25.1 (semver)
Create a notification for this product.
Date Public
2026-05-20 00:00
Credits
Qifan Zhang (Palo Alto Networks)
Show details on NVD website
To clipboard 

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CVE-2026-44927 (GCVE-0-2026-44927)

Vulnerability from cvelistv5 – Published: 2026-05-08 07:13 – Updated: 2026-05-10 05:46
VLAI
Summary
In uriparser before 1.0.2, there is pointer difference truncation to int in various places.
Severity
2.9 (Low)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-197 - Numeric Truncation Error
Assigner
References
Impacted products
Vendor Product Version
uriparser uriparser Affected: 0 , < 1.0.2 (semver)
Create a notification for this product.
Show details on NVD website
To clipboard 

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Mitigation

Phase: Implementation

Description:

  • Ensure that no casts, implicit or explicit, take place that move from a larger size primitive or a smaller size primitive.

No CAPEC attack patterns related to this CWE.

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