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Common Weakness Enumeration

CWE-834

Discouraged

Excessive Iteration

Abstraction: Class · Status: Incomplete

API response cwe.mitre.org

The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed.

137 vulnerabilities reference this CWE, most recent first.

CVE-2019-3565 (GCVE-0-2019-3565)

Vulnerability from cvelistv5 – Published: 2019-05-06 15:15 – Updated: 2024-08-04 19:12
VLAI
Summary
Legacy C++ Facebook Thrift servers (using cpp instead of cpp2) would not error upon receiving messages with containers of fields of unknown type. As a result, malicious clients could send short messages which would take a long time for the server to parse, potentially leading to denial of service. This issue affects Facebook Thrift prior to v2019.05.06.00.
Severity
No CVSS data available.
CWE
  • CWE-834 - Excessive Iteration (CWE-834)
Assigner
References
Impacted products
Vendor Product Version
Facebook Facebook Thrift Affected: v2019.05.06.00
Affected: unspecified , < v2019.05.06.00 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-3564 (GCVE-0-2019-3564)

Vulnerability from cvelistv5 – Published: 2019-05-06 15:15 – Updated: 2024-08-04 19:12
VLAI
Summary
Go Facebook Thrift servers would not error upon receiving messages with containers of fields of unknown type. As a result, malicious clients could send short messages which would take a long time for the server to parse, potentially leading to denial of service. This issue affects Facebook Thrift prior to v2019.03.04.00.
Severity
No CVSS data available.
CWE
  • CWE-834 - Excessive Iteration (CWE-834)
Assigner
References
Impacted products
Vendor Product Version
Facebook Facebook Thrift Affected: v2019.03.04.00
Affected: unspecified , < v2019.03.04.00 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-3559 (GCVE-0-2019-3559)

Vulnerability from cvelistv5 – Published: 2019-05-06 15:15 – Updated: 2024-08-04 19:12
VLAI
Summary
Java Facebook Thrift servers would not error upon receiving messages with containers of fields of unknown type. As a result, malicious clients could send short messages which would take a long time for the server to parse, potentially leading to denial of service. This issue affects Facebook Thrift prior to v2019.02.18.00.
Severity
No CVSS data available.
CWE
  • CWE-834 - Excessive Iteration (CWE-834)
Assigner
References
Impacted products
Vendor Product Version
Facebook Facebook Thrift Affected: v2019.02.18.00
Affected: unspecified , < v2019.02.18.00 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-3558 (GCVE-0-2019-3558)

Vulnerability from cvelistv5 – Published: 2019-05-06 15:15 – Updated: 2024-08-04 19:12
VLAI
Summary
Python Facebook Thrift servers would not error upon receiving messages with containers of fields of unknown type. As a result, malicious clients could send short messages which would take a long time for the server to parse, potentially leading to denial of service. This issue affects Facebook Thrift prior to v2019.02.18.00.
Severity
No CVSS data available.
CWE
  • CWE-834 - Excessive Iteration (CWE-834)
Assigner
References
Impacted products
Vendor Product Version
Facebook Facebook Thrift Affected: v2019.02.18.00
Affected: unspecified , < v2019.02.18.00 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-3552 (GCVE-0-2019-3552)

Vulnerability from cvelistv5 – Published: 2019-05-06 15:15 – Updated: 2024-08-04 19:12
VLAI
Summary
C++ Facebook Thrift servers (using cpp2) would not error upon receiving messages with containers of fields of unknown type. As a result, malicious clients could send short messages which would take a long time for the server to parse, potentially leading to denial of service. This issue affects Facebook Thrift prior to v2019.02.18.00.
Severity
No CVSS data available.
CWE
  • CWE-834 - Excessive Iteration (CWE-834)
Assigner
References
Impacted products
Vendor Product Version
Facebook Facebook Thrift Affected: v2019.02.18.00
Affected: unspecified , < v2019.02.18.00 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2018-20805 (GCVE-0-2018-20805)

Vulnerability from cvelistv5 – Published: 2020-11-23 15:20 – Updated: 2024-09-17 03:08
VLAI
Title
Invariant with $elemMatch
Summary
A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries, which perform an $elemMatch . This issue affects MongoDB Server v4.0 versions prior to 4.0.5 and MongoDB Server v3.6 versions prior to 3.6.10.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
URL Tags
https://jira.mongodb.org/browse/SERVER-38164 x_refsource_CONFIRM
Impacted products
Vendor Product Version
MongoDB Inc. MongoDB Server Affected: 3.6 , < 3.6.10 (custom)
Affected: 4.0 , < 4.0.5 (custom)
Create a notification for this product.
Date Public
2020-11-30 00:00
Show details on NVD website
To clipboard 

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GHSA-23W6-3W8W-8484

Vulnerability from github – Published: 2026-09-01 21:28 – Updated: 2026-09-01 21:28
VLAI
Summary
pypdf: Possible long runtimes/large memory usage when retrieving outlines
Details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires accessing the outlines of a document with either lots of entries or nested outlines with long re-used nesting paths.

Patches

This has been fixed in pypdf==6.16.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3966.

Severity
4.8 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

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    "severity": "MODERATE"
  },
  "details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires accessing the outlines of a document with either lots of entries or nested outlines with long re-used nesting paths.\n\n### Patches\n\nThis has been fixed in [pypdf==6.16.1](https://github.com/py-pdf/pypdf/releases/tag/6.16.1).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#3966](https://github.com/py-pdf/pypdf/pull/3966).",
  "id": "GHSA-23w6-3w8w-8484",
  "modified": "2026-09-01T21:28:38Z",
  "published": "2026-09-01T21:28:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-23w6-3w8w-8484"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/pull/3966"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/py-pdf/pypdf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.16.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pypdf: Possible long runtimes/large memory usage when retrieving outlines"
}

GHSA-248M-82V9-Q6G6

Vulnerability from github – Published: 2026-06-12 18:29 – Updated: 2026-06-12 18:29
VLAI
Summary
pypdf: Possible long runtimes for zero-only width values in cross-reference streamsuntimes for zero-only width values in cross-reference streams
Details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values.

Patches

This has been fixed in pypdf==6.12.0.

Workarounds

If developers are unable to upgrade their apps immediately, they should consider applying the changes from PR #3791.

Severity
3.3 (Low)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
5.1 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pypdf"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-48156"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-834"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-12T18:29:59Z",
    "nvd_published_at": "2026-05-28T16:16:29Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with `/W [0 0 0]` values and large `/Size` values.\n\n### Patches\n\nThis has been fixed in [pypdf==6.12.0](https://github.com/py-pdf/pypdf/releases/tag/6.12.0).\n\n### Workarounds\n\nIf developers are unable to upgrade their apps immediately, they should consider applying the changes from PR [#3791](https://github.com/py-pdf/pypdf/pull/3791).",
  "id": "GHSA-248m-82v9-q6g6",
  "modified": "2026-06-12T18:29:59Z",
  "published": "2026-06-12T18:29:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48156"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/pull/3791"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/commit/507d7c9aa6ea83389b954b9c3c0c528fe5d5da70"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/py-pdf/pypdf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.12.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pypdf: Possible long runtimes for zero-only width values in cross-reference streamsuntimes for zero-only width values in cross-reference streams"
}

GHSA-289V-JMV7-6XMX

Vulnerability from github – Published: 2022-05-24 17:47 – Updated: 2022-05-24 17:47
VLAI
Details

In ASUS RT-AX3000, ZenWiFi AX (XT8), RT-AX88U, and other ASUS routers with firmware < 3.0.0.4.386.42095 or < 9.0.0.4.386.41994, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set.

Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2021-3128"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-834"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-04-12T19:15:00Z",
    "severity": "HIGH"
  },
  "details": "In ASUS RT-AX3000, ZenWiFi AX (XT8), RT-AX88U, and other ASUS routers with firmware \u003c 3.0.0.4.386.42095 or \u003c 9.0.0.4.386.41994, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP\u0027s router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set.",
  "id": "GHSA-289v-jmv7-6xmx",
  "modified": "2022-05-24T17:47:10Z",
  "published": "2022-05-24T17:47:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3128"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-AX-XT8-/HelpDesk_BIOS"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX3000/HelpDesk_BIOS"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX55/HelpDesk_BIOS"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX56U/HelpDesk_BIOS"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX58U/HelpDesk_BIOS"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX68U/HelpDesk_BIOS"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX82U/HelpDesk_BIOS"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX86U/HelpDesk_BIOS"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX88U/HelpDesk_BIOS"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AC66U-B1/HelpDesk_Download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC1750_B1/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC1900/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC1900P/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC1900U/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC2900/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC3100/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC5300/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC58U/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC65U/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC68P/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC68R/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC68RW/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC68U/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC68W/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC85U/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC86U/HelpDesk_download"
    },
    {
      "type": "WEB",
      "url": "https://www.asus.com/supportonly/RT-AC88U/HelpDesk_download"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-2F25-PFQ3-C7H8

Vulnerability from github – Published: 2026-05-08 23:06 – Updated: 2026-05-08 23:06
VLAI
Summary
Phpseclib needs guardrails on large binaryfield integers
Details

Impact

Anyone loading untrusted ASN1 files (eg. X509 certificates, RSA PKCS8 private or public keys, etc)

Patches

https://github.com/phpseclib/phpseclib/commit/964d78101a70305df33f442f5490f0adb3b7e77f

Workarounds

No.

References

https://github.com/phpseclib/phpseclib/commit/964d78101a70305df33f442f5490f0adb3b7e77f https://www.usenix.org/system/files/usenixsecurity25-shi-bing.pdf

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

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpseclib/phpseclib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.0.34"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-49316"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-834"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-08T23:06:50Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nAnyone loading untrusted ASN1 files (eg. X509 certificates, RSA PKCS8 private or public keys, etc)\n\n### Patches\nhttps://github.com/phpseclib/phpseclib/commit/964d78101a70305df33f442f5490f0adb3b7e77f\n\n### Workarounds\nNo.\n\n### References\nhttps://github.com/phpseclib/phpseclib/commit/964d78101a70305df33f442f5490f0adb3b7e77f\nhttps://www.usenix.org/system/files/usenixsecurity25-shi-bing.pdf",
  "id": "GHSA-2f25-pfq3-c7h8",
  "modified": "2026-05-08T23:06:50Z",
  "published": "2026-05-08T23:06:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/phpseclib/phpseclib/security/advisories/GHSA-2f25-pfq3-c7h8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-49316"
    },
    {
      "type": "WEB",
      "url": "https://github.com/phpseclib/phpseclib/commit/964d78101a70305df33f442f5490f0adb3b7e77f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2023-49316.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/phpseclib/phpseclib"
    },
    {
      "type": "WEB",
      "url": "https://github.com/phpseclib/phpseclib/releases/tag/3.0.34"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Phpseclib needs guardrails on large binaryfield integers"
}

No mitigation information available for this CWE.

No CAPEC attack patterns related to this CWE.

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