Common Weakness Enumeration
CWE-834
DiscouragedExcessive Iteration
Abstraction: Class · Status: Incomplete
The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed.
124 vulnerabilities reference this CWE, most recent first.
CVE-2021-32778 (GCVE-0-2021-32778)
Vulnerability from cvelistv5 – Published: 2021-08-24 20:30 – Updated: 2024-08-03 23:33
VLAI
EPSS
VEX
Title
Excessive CPU utilization when closing HTTP/2 streams
Summary
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy’s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100.
Severity
5.8 (Medium)
CWE
- CWE-834 - Excessive Iteration
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.envoyproxy.io/docs/envoy/v1.19.0/vers… | x_refsource_MISC |
| https://github.com/envoyproxy/envoy/security/advi… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| envoyproxy | envoy |
Affected:
>= 1.19.0, < 1.19.1
Affected: >= 1.18.0, < 1.18.4 Affected: >= 1.17.0, < 1.17.4 Affected: >= 1.16.0, < 1.16.5 |
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CVE-2021-31812 (GCVE-0-2021-31812)
Vulnerability from cvelistv5 – Published: 2021-06-12 09:45 – Updated: 2024-08-03 23:10
VLAI
EPSS
VEX
Title
A carefully crafted PDF file can trigger an infinite loop while loading the file
Summary
In Apache PDFBox, a carefully crafted PDF file can trigger an infinite loop while loading the file. This issue affects Apache PDFBox version 2.0.23 and prior 2.0.x versions.
Severity
No CVSS data available.
CWE
- CWE-834 - Excessive Iteration
Assigner
References
16 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache PDFBox |
Affected:
Apache PDFBox , < 2.0.24
(custom)
|
Credits
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CVE-2021-27807 (GCVE-0-2021-27807)
Vulnerability from cvelistv5 – Published: 2021-03-19 16:05 – Updated: 2025-02-13 16:27
VLAI
EPSS
VEX
Title
A carefully crafted PDF file can trigger an infinite loop while loading the file
Summary
A carefully crafted PDF file can trigger an infinite loop while loading the file. This issue affects Apache PDFBox version 2.0.22 and prior 2.0.x versions.
Severity
No CVSS data available.
CWE
- CWE-834 - Excessive Iteration
Assigner
References
21 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache PDFBox |
Affected:
Apache PDFBox , ≤ 2.0.22
(custom)
|
Credits
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CVE-2019-3565 (GCVE-0-2019-3565)
Vulnerability from cvelistv5 – Published: 2019-05-06 15:15 – Updated: 2024-08-04 19:12
VLAI
EPSS
VEX
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
4 references
| URL | Tags |
|---|---|
| https://github.com/facebook/fbthrift/commit/01686… | x_refsource_MISC |
| https://www.facebook.com/security/advisories/cve-… | x_refsource_MISC |
| http://www.securityfocus.com/bid/108280 | vdb-entryx_refsource_BID |
| https://lists.apache.org/thread.html/rd0e44e8ef71… | mailing-listx_refsource_MLIST |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Facebook Thrift |
Affected:
v2019.05.06.00
Affected: unspecified , < v2019.05.06.00 (custom) |
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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
EPSS
VEX
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
3 references
| URL | Tags |
|---|---|
| https://github.com/facebook/fbthrift/commit/c461c… | x_refsource_MISC |
| https://www.facebook.com/security/advisories/cve-… | x_refsource_MISC |
| https://lists.apache.org/thread.html/rd0e44e8ef71… | mailing-listx_refsource_MLIST |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Facebook Thrift |
Affected:
v2019.03.04.00
Affected: unspecified , < v2019.03.04.00 (custom) |
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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
EPSS
VEX
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
3 references
| URL | Tags |
|---|---|
| https://github.com/facebook/fbthrift/commit/a5634… | x_refsource_MISC |
| https://www.facebook.com/security/advisories/cve-… | x_refsource_MISC |
| https://lists.apache.org/thread.html/rd0e44e8ef71… | mailing-listx_refsource_MLIST |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Facebook Thrift |
Affected:
v2019.02.18.00
Affected: unspecified , < v2019.02.18.00 (custom) |
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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
EPSS
VEX
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
4 references
| URL | Tags |
|---|---|
| https://github.com/facebook/fbthrift/commit/c5d6e… | x_refsource_MISC |
| https://www.facebook.com/security/advisories/cve-… | x_refsource_MISC |
| http://www.securityfocus.com/bid/108274 | vdb-entryx_refsource_BID |
| https://lists.apache.org/thread.html/rd0e44e8ef71… | mailing-listx_refsource_MLIST |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Facebook Thrift |
Affected:
v2019.02.18.00
Affected: unspecified , < v2019.02.18.00 (custom) |
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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
EPSS
VEX
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
3 references
| URL | Tags |
|---|---|
| https://github.com/facebook/fbthrift/commit/c5d6e… | x_refsource_MISC |
| http://www.securityfocus.com/bid/108279 | vdb-entryx_refsource_BID |
| https://lists.apache.org/thread.html/rd0e44e8ef71… | mailing-listx_refsource_MLIST |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Facebook Thrift |
Affected:
v2019.02.18.00
Affected: unspecified , < v2019.02.18.00 (custom) |
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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
EPSS
VEX
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)
CWE
- CWE-834 - Excessive Iteration
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://jira.mongodb.org/browse/SERVER-38164 | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MongoDB Inc. | MongoDB Server |
Affected:
3.6 , < 3.6.10
(custom)
Affected: 4.0 , < 4.0.5 (custom) |
Date Public
2020-11-30 00:00
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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
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"name": "pypdf"
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"id": "GHSA-248m-82v9-q6g6",
"modified": "2026-06-12T18:29:59Z",
"published": "2026-06-12T18:29:59Z",
"references": [
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"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"
},
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"url": "https://github.com/py-pdf/pypdf/pull/3791"
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},
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"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"
}
No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.