Common Weakness Enumeration

CWE-758

Weakness Allowed-with-Review

Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

Abstraction: Class · Status: Incomplete

API response cwe.mitre.org

The product uses an API function, data structure, or other entity in a way that relies on properties that are not always guaranteed to hold for that entity.

Mapping guidance

This CWE entry is a Class and might have Base-level children that would be more appropriate

Examine children of this entry to see if there is a better fit

Relationships and members
ChildOf: CWE-710 · View CWE-1000
Modes of introduction
Porting

This can lead to resultant weaknesses when the required properties change, such as when the product is ported to a different platform.

Implementation

This can lead to resultant weaknesses if an interaction error (CWE-435) occurs.

Detection methods

Fuzzing

Fuzz testing (fuzzing) is a powerful technique for generating large numbers of diverse inputs - either randomly or algorithmically - and dynamically invoking the code with those inputs. Even with random inputs, it is often capable of generating unexpected results such as crashes, memory corruption, or resource consumption. Fuzzing effectively produces repeatable test cases that clearly indicate bugs, which helps developers to diagnose the issues.

Effectiveness: High

Content history
Submission: CWE Content Team · MITRE · 2009-03-03 · CWE 1.3
Modification: CWE Content Team · MITRE · 2011-06-01 · CWE 1.13

updated Common_Consequences

Modification: CWE Content Team · MITRE · 2012-05-11 · CWE 2.2

updated Relationships

Modification: CWE Content Team · MITRE · 2014-07-30 · CWE 2.8

updated Relationships

Modification: CWE Content Team · MITRE · 2017-01-19 · CWE 2.10

updated Relationships

Modification: CWE Content Team · MITRE · 2017-11-08 · CWE 3.0

updated Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2018-03-27 · CWE 3.1

updated Relationships

Modification: CWE Content Team · MITRE · 2019-01-03 · CWE 3.2

updated Relationships, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2020-02-24 · CWE 4.0

updated Relationships

Modification: CWE Content Team · MITRE · 2020-08-20 · CWE 4.2

updated Relationships

Modification: CWE Content Team · MITRE · 2023-01-31 · CWE 4.10

updated Description

Modification: CWE Content Team · MITRE · 2023-04-27 · CWE 4.11

updated Detection_Factors, Relationships

Modification: CWE Content Team · MITRE · 2023-06-29 · CWE 4.12

updated Mapping_Notes

Modification: CWE Content Team · MITRE · 2024-02-29 · CWE 4.14

updated Demonstrative_Examples

Modification: CWE Content Team · MITRE · 2025-12-11 · CWE 4.19

updated Applicable_Platforms, Common_Consequences, Time_of_Introduction

Modification: CWE Content Team · MITRE · 2026-10-28 · CWE 5.0

updated Description, Modes_of_Introduction, References, Time_of_Introduction

42 vulnerabilities reference this CWE, most recent first.

CVE-2026-119133 (GCVE-0-2026-119133)

Vulnerability from cvelistv5 – Published: 2026-10-29 15:58 – Updated: 2026-10-29 17:14
VLAI
Title
Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Misaligned VMContext via Exception Tags
Summary
Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a memory misalignment flaw in VMContext layout that causes undefined behavior when modules contain an odd number of exception tags. A WebAssembly module with an odd tag count misaligns subsequent host fields in embedders with exceptions enabled, although no exploitation path is currently known.
Severity
2.1 (Low)
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
2.6 (Low)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-29 16:16 UTC
CWE
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7605 records in the last 180 days details
References
Impacted products
Vendor Product Version
bytecodealliance wasmtime Affected: 47.0.0 , < 48.0.6 (semver)
Unaffected: 48.0.6 (semver)
Affected: 49.0.0 , < 49.0.3 (semver)
Unaffected: 49.0.3 (semver)
    cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*
    cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-10-14 00:00
Show details on NVD website
To clipboard 

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CVE-2026-54604 (GCVE-0-2026-54604)

Vulnerability from cvelistv5 – Published: 2026-09-17 20:29 – Updated: 2026-09-18 20:06
VLAI
Title
OpenSlide: openslide_read_region() returns uninitialized memory with libtiff 4.7.1
Summary
OpenSlide is a C library for reading whole slide image files. Prior to 4.0.1, a behavior change in libtiff 4.7.1 causes the indirect TIFF tile path in src/openslide-decode-tiff.c and _openslide_tiff_read_tile() to request a full-height destination for a partial bottom tile row, allowing uninitialized heap memory to enter pixel data returned by openslide_read_region(). A crafted but valid slide can trigger the issue in TIFF-based formats other than Hamamatsu NDPI when a network service renders attacker-provided slides. Successful extraction depends on pixel transparency handling and recompression, OpenSlide with libtiff 4.7.0 or earlier is not affected, and official binary builds 4.0.0.10 and 4.0.0.11 are affected. This issue is fixed in OpenSlide 4.0.1 and official binary build 4.0.0.12.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 20:06 UTC
CWE
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
  • CWE-908 - Use of Uninitialized Resource
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
References
Impacted products
Vendor Product Version
openslide openslide Affected: < 4.0.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-50185 (GCVE-0-2026-50185)

Vulnerability from cvelistv5 – Published: 2026-07-17 18:35 – Updated: 2026-07-20 19:24
VLAI
Title
RustCrypto Cmov/CmovEq on aarch64 can produce wrong results if high-bits of registers are set
Summary
RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewritten as branches by the compiler. From 0.1.1 until 0.5.4, the aarch64 implementations of Cmov and CmovEq in cmov/src/backends/aarch64.rs assume high bits are zero-extended when loading values smaller than a register, so set high bits such as [8..] in a Cmov selector or [16..] of self or other in the u16 and i16 CmovEq implementations can cause left.cmovz(&right, condition) to produce incorrect output. This issue is fixed in version 0.5.4.
Severity
2 (Low)
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 19:24 UTC
CWE
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
References
Impacted products
Vendor Product Version
RustCrypto utils Affected: >= 0.1.1, < 0.5.4
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-40279 (GCVE-0-2026-40279)

Vulnerability from cvelistv5 – Published: 2026-04-21 16:29 – Updated: 2026-04-21 19:18
VLAI
Title
BACnet Stack: Undefined-behavior signed left shift in `decode_signed32()`
Summary
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, decode_signed32() in src/bacnet/bacint.c reconstructs a 32-bit signed integer from four APDU bytes using signed left shifts. When any of the four bytes has bit 7 set (value ≥ 0x80), the left-shift operation overflows a signed int32_t, which is undefined behavior per the C standard. This is flagged thousands of times per minute by UndefinedBehaviorSanitizer on any BACnet input containing signed-integer property values with high-bit-set bytes. This vulnerability is fixed in 1.4.3.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-21 19:18 UTC
CWE
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-34549 (GCVE-0-2026-34549)

Vulnerability from cvelistv5 – Published: 2026-03-31 22:11 – Updated: 2026-04-03 16:41
VLAI
Title
iccDEV: UB at IccUtil.cpp
Summary
iccDEV provides a set of libraries and tools for working with ICC color management profiles. Prior to version 2.3.1.6, there is an Undefined Behavior (UB) condition in IccUtil.cpp triggered by a crafted input profile. Under UndefinedBehaviorSanitizer, the issue is reported as invalid left shift operations on icUInt32Number (unsigned 32-bit) where the shifted value “cannot be represented” in that type. This issue has been patched in version 2.3.1.6.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-03 16:41 UTC
CWE
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-34547 (GCVE-0-2026-34547)

Vulnerability from cvelistv5 – Published: 2026-03-31 22:08 – Updated: 2026-04-01 13:26
VLAI
Title
iccDEV: UB at IccUtil.cpp
Summary
iccDEV provides a set of libraries and tools for working with ICC color management profiles. Prior to version 2.3.1.6, an Undefined Behavior (UB) condition in IccUtil.cpp can be triggered by a crafted ICC profile when running iccDumpProfile. This issue has been patched in version 2.3.1.6.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-01 13:26 UTC
CWE
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-34537 (GCVE-0-2026-34537)

Vulnerability from cvelistv5 – Published: 2026-03-31 22:00 – Updated: 2026-04-03 16:39
VLAI
Title
iccDEV: UB in CIccOpDefEnvVar::Exec()
Summary
iccDEV provides a set of libraries and tools for working with ICC color management profiles. Prior to version 2.3.1.6, a crafted ICC profile can trigger Undefined Behavior (UB) in CIccOpDefEnvVar::Exec() due to invalid enum values being loaded for icSigCmmEnvVar. The issue is observable under UBSan as a “load of value … not a valid value for type icSigCmmEnvVar”, indicating an invalid enum/type value being consumed during ICC profile processing. This issue has been patched in version 2.3.1.6.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-03 16:39 UTC
CWE
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-34533 (GCVE-0-2026-34533)

Vulnerability from cvelistv5 – Published: 2026-03-31 21:56 – Updated: 2026-04-03 16:38
VLAI
Title
iccDEV: UB in CIccCalculatorFunc::ApplySequence()
Summary
iccDEV provides a set of libraries and tools for working with ICC color management profiles. Prior to version 2.3.1.6, a crafted ICC profile can trigger Undefined Behavior (UB) in CIccCalculatorFunc::ApplySequence() due to invalid enum values being loaded for icChannelFuncSignature. The issue is observable under UBSan as a “load of value … not a valid value for type icChannelFuncSignature”, indicating a type/enum value confusion scenario during ICC profile processing. This issue has been patched in version 2.3.1.6.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-03 16:38 UTC
CWE
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-28528 (GCVE-0-2026-28528)

Vulnerability from cvelistv5 – Published: 2026-03-30 14:08 – Updated: 2026-11-08 14:01 X_Open Source
VLAI
Title
BlueKitchen BTstack < 1.8.1 AVRCP Browsing Target GET_FOLDER_ITEMS Handler OOB Read / Undefined Behavior
Summary
BlueKitchen BTstack versions prior to 1.8.1 contain an out-of-bounds read vulnerability in the AVRCP Browsing Target GET_FOLDER_ITEMS handler that fails to validate packet boundaries and attribute count data. An attacker with a paired Bluetooth Classic connection can exploit insufficient bounds checking on the attr_id parameter to cause crashes and corrupt attribute bitmap state.
Severity
2.1 (Low)
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
4.6 (Medium)
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-30 16:39 UTC
CWE
  • CWE-125 - Out-of-bounds Read
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7605 records in the last 180 days details
References
Impacted products
Vendor Product Version
BlueKitchen GmbH BTstack Affected: 0 , < 1.8.1 (semver)
Create a notification for this product.
Credits
Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc. VulnCheck
Show details on NVD website
To clipboard 

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CVE-2026-24411 (GCVE-0-2026-24411)

Vulnerability from cvelistv5 – Published: 2026-01-24 01:16 – Updated: 2026-01-26 16:17
VLAI
Title
iccDEV has Undefined Behavior and Null Pointer Deference in CIccTagXmlSegmentedCurve::ToXml()
Summary
iccDEV provides libraries and tools for interacting with, manipulating, and applying ICC color management profiles. Versions 2.3.1.1 and below have Undefined Behavior in CIccTagXmlSegmentedCurve::ToXml(). This occurs when user-controllable input is unsafely incorporated into ICC profile data or other structured binary blobs. Successful exploitation may allow an attacker to perform DoS, manipulate data, bypass application logic and Code Execution. This issue has been fixed in version 2.3.1.2.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-26 16:14 UTC
CWE
  • CWE-20 - Improper Input Validation
  • CWE-476 - NULL Pointer Dereference
  • CWE-690 - Unchecked Return Value to NULL Pointer Dereference
  • CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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No mitigation information available for this CWE.

No CAPEC attack patterns related to this CWE.

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