CWE-195
Weakness AllowedSigned to Unsigned Conversion Error
Abstraction: Variant · Status: Draft
The product uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive.
Mapping guidance
This CWE entry is at the Variant level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.
Relationships and members
Modes of introduction
It is dangerous to rely on implicit casts between signed and unsigned numbers because the result can take on an unexpected value and violate assumptions made by the program.
Detection methods
Automated Static Analysis
Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)
Effectiveness: High
Content history
updated Applicable_Platforms, Common_Consequences, Relationships, Other_Notes, Taxonomy_Mappings
updated Demonstrative_Examples
updated Common_Consequences, Description, Other_Notes, Relationships
updated Demonstrative_Examples
updated Demonstrative_Examples
updated Relationships
updated Common_Consequences
updated Common_Consequences
updated Demonstrative_Examples, References, Relationships
updated Demonstrative_Examples, Description
updated Relationships, Taxonomy_Mappings
updated Relationships
updated Observed_Examples, Taxonomy_Mappings
updated Relationships
updated Relationships
updated Relationships
updated Relationships
updated Demonstrative_Examples, References
updated Description
updated Detection_Factors, Relationships
updated Mapping_Notes
updated Observed_Examples
updated Weakness_Ordinalities
updated Common_Consequences, Demonstrative_Examples, Description, Modes_of_Introduction, References
60 vulnerabilities reference this CWE, most recent first.
CVE-2026-115921 (GCVE-0-2026-115921)
Vulnerability from cvelistv5 – Published: 2026-10-26 17:28 – Updated: 2026-10-31 01:40| URL | Tags |
|---|---|
| https://github.com/onnx/onnx/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/onnx/onnx/pull/7916 | x_refsource_MISC |
| https://github.com/onnx/onnx/commit/dd6bc92ea39fd… | x_refsource_MISC |
| https://github.com/onnx/onnx/releases/tag/v1.22.0 | x_refsource_MISC |
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CVE-2026-115679 (GCVE-0-2026-115679)
Vulnerability from cvelistv5 – Published: 2026-10-26 15:46 – Updated: 2026-10-26 16:18- CWE-195 - Signed to unsigned conversion error
| Vendor | Product | Version | |
|---|---|---|---|
| Keil | MDK-Middleware |
Affected:
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CVE-2026-115678 (GCVE-0-2026-115678)
Vulnerability from cvelistv5 – Published: 2026-10-26 15:38 – Updated: 2026-10-26 16:17- CWE-195 - Signed to unsigned conversion error
| Vendor | Product | Version | |
|---|---|---|---|
| Keil | MDK-Middleware |
Affected:
8.0.0 , ≤ 8.3.0
(semver)
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CVE-2026-110735 (GCVE-0-2026-110735)
Vulnerability from cvelistv5 – Published: 2026-10-14 15:41 – Updated: 2026-10-20 01:36 Disputed- CWE-195 - Signed to Unsigned Conversion Error
| Vendor | Product | Version | |
|---|---|---|---|
| godotengine | Godot Engine |
Affected:
1.0.0 , ≤ 4.7.2
(semver)
cpe:2.3:a:godotengine:godot_engine:*:*:*:*:*:*:*:* |
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CVE-2026-102639 (GCVE-0-2026-102639)
Vulnerability from cvelistv5 – Published: 2026-09-29 17:57 – Updated: 2026-11-08 14:00 X_Open Source- CWE-195 - Signed to Unsigned Conversion Error
| URL | Tags |
|---|---|
| https://github.com/MobilityDB/MobilityDB/security… | vendor-advisorytechnical-description |
| https://github.com/MobilityDB/MobilityDB/releases… | patchrelease-notes |
| https://github.com/MobilityDB/MobilityDB/releases… | patchrelease-notes |
| https://www.vulncheck.com/advisories/mobilitydb-t… | third-party-advisory |
| Vendor | Product | Version | |
|---|---|---|---|
| MobilityDB | MobilityDB |
Affected:
1.1.0 , ≤ 1.1.2
(semver)
Affected: 1.2.0 , < 1.2.2 (semver) Affected: 1.3.0 , < 1.3.1 (semver) |
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CVE-2026-101937 (GCVE-0-2026-101937)
Vulnerability from cvelistv5 – Published: 2026-10-14 16:40 – Updated: 2026-10-14 20:15- CWE-195 - Signed to Unsigned Conversion Error
| URL | Tags |
|---|---|
| https://supportportal.juniper.net/JSA112186 | vendor-advisory |
| Vendor | Product | Version | |
|---|---|---|---|
| Juniper Networks | Junos OS |
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CVE-2026-85441 (GCVE-0-2026-85441)
Vulnerability from cvelistv5 – Published: 2026-09-03 22:38 – Updated: 2026-09-04 13:40- CWE-195 - Signed to Unsigned Conversion Error
| URL | Tags |
|---|---|
| https://github.com/themoos/core-moos/pull/74 | issue-trackingpatch |
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CVE-2026-82943 (GCVE-0-2026-82943)
Vulnerability from cvelistv5 – Published: 2026-10-26 08:41 – Updated: 2026-10-26 14:35| URL | Tags |
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CVE-2026-77406 (GCVE-0-2026-77406)
Vulnerability from cvelistv5 – Published: 2026-09-16 14:37 – Updated: 2026-09-16 18:35- CWE-195 - Signed to Unsigned Conversion Error
| URL | Tags |
|---|---|
| https://github.com/rabbitmq/amqp091-go/security/a… | x_refsource_CONFIRM |
| https://github.com/rabbitmq/amqp091-go/pull/351 | x_refsource_MISC |
| https://github.com/rabbitmq/amqp091-go/commit/3b8… | x_refsource_MISC |
| https://github.com/rabbitmq/amqp091-go/releases/t… | x_refsource_MISC |
| Vendor | Product | Version | |
|---|---|---|---|
| rabbitmq | amqp091-go |
Affected:
< 1.13.0
|
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CVE-2026-74221 (GCVE-0-2026-74221)
Vulnerability from cvelistv5 – Published: 2026-09-29 21:29 – Updated: 2026-09-30 13:47- CWE-195 - Signed to Unsigned Conversion Error
| URL | Tags |
|---|---|
| https://github.com/u-boot/u-boot/commit/1c0aff3a5… | patch |
| https://github.com/u-boot/u-boot/blob/v2026.07/ne… | technical-description |
| https://github.com/u-boot/u-boot | product |
| https://www.vulncheck.com/advisories/u-boot-befor… | third-party-advisory |
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.