Common Weakness Enumeration

CWE-194

Allowed

Unexpected Sign Extension

Abstraction: Variant · Status: Incomplete

API response cwe.mitre.org

The product performs an operation on a number that causes it to be sign extended when it is transformed into a larger data type. When the original number is negative, this can produce unexpected values that lead to resultant weaknesses.

8 vulnerabilities reference this CWE, most recent first.

CVE-2022-32138 (GCVE-0-2022-32138)

Vulnerability from cvelistv5 – Published: 2022-06-24 07:46 – Updated: 2024-09-17 01:47
VLAI
Title
CODESYS runtime system prone to denial of service due to Unexpected Sign Extension
Summary
In multiple CODESYS products, a remote attacker may craft a request which may cause an unexpected sign extension, resulting in a denial-of-service condition or memory overwrite.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-194 - Unexpected Sign Extension
Assigner
References
Impacted products
Vendor Product Version
CODESYS Runtime Toolkit Affected: V2 , < V2.4.7.57 (custom)
Create a notification for this product.
CODESYS PLCWinNT Affected: V2 , < V2.4.7.57 (custom)
Create a notification for this product.
Date Public
2022-06-15 00:00
Show details on NVD website
To clipboard 

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CVE-2021-38434 (GCVE-0-2021-38434)

Vulnerability from cvelistv5 – Published: 2021-10-18 12:38 – Updated: 2024-09-16 22:39
VLAI
Title
FATEK Automation WinProladder
Summary
FATEK Automation WinProladder versions 3.30 and prior lacks proper validation of user-supplied data when parsing project files, which could result in an unexpected sign extension. An attacker could leverage this vulnerability to execute arbitrary code.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
  • CWE-194 - UNEXPECTED SIGN EXTENSION CWE-194
Assigner
References
Impacted products
Vendor Product Version
FATEK Automation WinProladder Affected: All , ≤ 3.30 (custom)
Create a notification for this product.
Date Public
2021-10-07 00:00
Credits
xina1i and Natnael Samson (@NattiSamson), working with Trend Micro’s Zero Day Initiative, reported these vulnerabilities to CISA.
Show details on NVD website
To clipboard 

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CVE-2020-13544 (GCVE-0-2020-13544)

Vulnerability from cvelistv5 – Published: 2021-01-06 14:48 – Updated: 2024-08-04 12:18
VLAI
Summary
An exploitable sign extension vulnerability exists in the TextMaker document parsing functionality of SoftMaker Office 2021’s TextMaker application. A specially crafted document can cause the document parser to sign-extend a length used to terminate a loop, which can later result in the loop’s index being used to write outside the bounds of a heap buffer during the reading of file data. An attacker can entice the victim to open a document to trigger this vulnerability.
Severity
8.8 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
  • CWE-194 - Unexpected Sign Extension
Assigner
References
Impacted products
Vendor Product Version
n/a Softmaker Affected: SoftMaker Software GmbH SoftMaker Office TextMaker 2021 (revision 1014)
Show details on NVD website
To clipboard 

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CVE-2018-10887 (GCVE-0-2018-10887)

Vulnerability from cvelistv5 – Published: 2018-07-10 14:00 – Updated: 2024-09-17 01:06
VLAI
Summary
A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads to an out of bound read, allowing to read before the base object. An attacker may use this flaw to leak memory addresses or cause a Denial of Service.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
libgit2 libgit2 Affected: before version 0.27.3
Create a notification for this product.
Date Public
2018-07-09 00:00
Show details on NVD website
To clipboard 

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GHSA-5GCQ-G5P3-PJP4

Vulnerability from github – Published: 2022-05-13 01:02 – Updated: 2022-05-13 01:02
VLAI
Details

A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads to an out of bound read, allowing to read before the base object. An attacker may use this flaw to leak memory addresses or cause a Denial of Service.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2018-10887"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125",
      "CWE-194"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-07-10T14:29:00Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads to an out of bound read, allowing to read before the base object. An attacker may use this flaw to leak memory addresses or cause a Denial of Service.",
  "id": "GHSA-5gcq-g5p3-pjp4",
  "modified": "2022-05-13T01:02:09Z",
  "published": "2022-05-13T01:02:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-10887"
    },
    {
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      "url": "https://github.com/libgit2/libgit2/releases/tag/v0.27.3"
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      "url": "https://lists.debian.org/debian-lts-announce/2022/03/msg00031.html"
    }
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      "type": "CVSS_V3"
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}

GHSA-C8G4-H8J5-VJPP

Vulnerability from github – Published: 2025-12-02 21:31 – Updated: 2025-12-03 00:30
VLAI
Details

Inappropriate implementation in DevTools in Google Chrome prior to 143.0.7499.41 allowed an attacker who convinced a user to install a malicious extension to potentially perform a sandbox escape via a crafted Chrome Extension. (Chromium security severity: High)

Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-13632"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-194"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-02T19:15:47Z",
    "severity": "MODERATE"
  },
  "details": "Inappropriate implementation in DevTools in Google Chrome prior to 143.0.7499.41 allowed an attacker who convinced a user to install a malicious extension to potentially perform a sandbox escape via a crafted Chrome Extension. (Chromium security severity: High)",
  "id": "GHSA-c8g4-h8j5-vjpp",
  "modified": "2025-12-03T00:30:28Z",
  "published": "2025-12-02T21:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-13632"
    },
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      "type": "WEB",
      "url": "https://chromereleases.googleblog.com/2025/12/stable-channel-update-for-desktop.html"
    },
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      "type": "WEB",
      "url": "https://issues.chromium.org/issues/439058242"
    }
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      "type": "CVSS_V3"
    }
  ]
}

GHSA-QG68-H8VR-3VC5

Vulnerability from github – Published: 2022-06-25 00:01 – Updated: 2022-06-25 00:01
VLAI
Details

In multiple CODESYS products, a remote attacker may craft a request which may cause an unexpected sign extension, resulting in a denial-of-service condition or memory overwrite.

Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2022-32138"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-194"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-06-24T08:15:00Z",
    "severity": "HIGH"
  },
  "details": "In multiple CODESYS products, a remote attacker may craft a request which may cause an unexpected sign extension, resulting in a denial-of-service condition or memory overwrite.",
  "id": "GHSA-qg68-h8vr-3vc5",
  "modified": "2022-06-25T00:01:01Z",
  "published": "2022-06-25T00:01:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-32138"
    },
    {
      "type": "WEB",
      "url": "https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=17139\u0026token=ec67d15a433b61c77154166c20c78036540cacb0\u0026download="
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      "type": "CVSS_V3"
    }
  ]
}

GHSA-RQ4P-MWVQ-FHVQ

Vulnerability from github – Published: 2022-05-24 19:17 – Updated: 2022-05-24 19:17
VLAI
Details

FATEK Automation WinProladder versions 3.30 and prior lacks proper validation of user-supplied data when parsing project files, which could result in an unexpected sign extension. An attacker could leverage this vulnerability to execute arbitrary code.

Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2021-38434"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-194"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-10-18T13:15:00Z",
    "severity": "HIGH"
  },
  "details": "FATEK Automation WinProladder versions 3.30 and prior lacks proper validation of user-supplied data when parsing project files, which could result in an unexpected sign extension. An attacker could leverage this vulnerability to execute arbitrary code.",
  "id": "GHSA-rq4p-mwvq-fhvq",
  "modified": "2022-05-24T19:17:49Z",
  "published": "2022-05-24T19:17:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-38434"
    },
    {
      "type": "WEB",
      "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-280-06"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}
Mitigation
Implementation

Avoid using signed variables if you don't need to represent negative values. When negative values are needed, perform validation after you save those values to larger data types, or before passing them to functions that are expecting unsigned values.

No CAPEC attack patterns related to this CWE.

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