Common Weakness Enumeration

CWE-834

Discouraged

Excessive Iteration

Abstraction: Class · Status: Incomplete

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

144 vulnerabilities reference this CWE, most recent first.

CVE-2026-87721 (GCVE-0-2026-87721)

Vulnerability from cvelistv5 – Published: 2026-09-24 22:02 – Updated: 2026-09-25 16:49
VLAI
Title
Denial of Service via Exponential Backtracking in ANTLR Search Query Parser in Gerrit Code Review
Summary
Uncontrolled Resource Consumption (CWE-400 / CWE-407) in the ANTLR 3 search query parser (QueryParser / Query.g) in Gerrit Code Review versions 2.0.19 through 3.12.9, 3.13.0 through 3.13.8, and 3.14.0 through 3.14.2 allows an unauthenticated remote attacker (or an authenticated user if anonymous read access is disabled) to cause a persistent denial of service (CPU exhaustion and HTTP worker thread pool starvation requiring a server restart) via crafted search queries containing deeply nested parentheses sent to query evaluation endpoints (/changes/?q=, /accounts/?q=, /groups/?query=, /projects/?query=, /Documentation/?q=, /changes/{id}/query?expression=, or SSH gerrit query). Because syntactic predicates in conditionOr and conditionAnd recurse via conditionBase without memoization prior to capability or visibility checks and worker threads do not abort when the client disconnects, a small number of requests (such as 25 requests matching default httpd.maxThreads) can permanently pin all HTTP worker threads. This issue is fixed in Gerrit Code Review versions 3.12.10, 3.13.9, and 3.14.3.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 16:45 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-407 - Inefficient Algorithmic Complexity
  • CWE-834 - Excessive Iteration
Impacted products
Vendor Product Version
Gerrit Gerrit Affected: 2.0.19 , < 3.12.10 (semver)
Affected: 3.13.0 , < 3.13.9 (semver)
Affected: 3.14.0 , < 3.14.3 (semver)
Create a notification for this product.
Date Public
2026-09-22 00:00
Credits
Show details on NVD website

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CVE-2026-84311 (GCVE-0-2026-84311)

Vulnerability from cvelistv5 – Published: 2026-09-01 20:03 – Updated: 2026-09-02 16:02
VLAI
Title
pypdf: Possible long runtimes/large memory usage when extracting XForm objects
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 13:42 UTC
CWE
Impacted products
Vendor Product Version
py-pdf pypdf Affected: < 6.16.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-84310 (GCVE-0-2026-84310)

Vulnerability from cvelistv5 – Published: 2026-09-01 20:00 – Updated: 2026-09-04 02:07
VLAI
Title
pypdf: Possible long runtimes/large memory usage when retrieving outlines
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 02:07 UTC
CWE
  • CWE-405 - Asymmetric Resource Consumption (Amplification)
  • CWE-834 - Excessive Iteration
Impacted products
Vendor Product Version
py-pdf pypdf Affected: < 6.16.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-81880 (GCVE-0-2026-81880)

Vulnerability from cvelistv5 – Published: 2026-09-22 15:09 – Updated: 2026-09-25 23:29
VLAI
Title
radare2: Uncontrolled resource consumption in radare2 PEF loader
Summary
radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Apple Preferred Executable Format loader was vulnerable because the PEF loader accepted relocSecCount values that were not bounded by the number of sections or complete relocation records in the input. The vulnerability is triggered by normal binary-format auto-detection of a small crafted Apple PEF file. The loader could perform up to 268,435,456 relocation-section iterations and repeated buffer operations after record offsets passed the end of the file. This can cause denial of service through excessive CPU consumption and prolonged processing. This issue is fixed in version 6.2.0.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 23:29 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-834 - Excessive Iteration
Impacted products
Vendor Product Version
radareorg radare2 Affected: < 6.2.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-81872 (GCVE-0-2026-81872)

Vulnerability from cvelistv5 – Published: 2026-09-16 20:42 – Updated: 2026-09-17 13:36
VLAI
Title
OpenTelemetry-Go: BatchProcessor can busy-spin when export buffer is full
Summary
OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to version 0.21.0, the go.opentelemetry.io/otel/sdk/log BatchingProcessor can enter a tight CPU loop when attacker-driven log emission fills its asynchronous export buffer while the exporter is backpressured. NewBatchingProcessor wraps the exporter with newBufferExporter(exporter, 1), and the poll loop calls queue.TryDequeue and bufferExporter.EnqueueExport before immediately signaling pollTrigger whenever the queue remains at or above batchSize. Because a failed nonblocking EnqueueExport leaves the queue length unchanged, the processor repeatedly retries without waiting for its ticker, exhausting CPU and degrading or denying service in the embedding process. This issue is fixed in version 0.21.0.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 13:36 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-834 - Excessive Iteration
Impacted products
Show details on NVD website

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CVE-2026-77399 (GCVE-0-2026-77399)

Vulnerability from cvelistv5 – Published: 2026-09-22 18:58 – Updated: 2026-09-23 14:36
VLAI
Title
icalendar: Denial of service via unbounded VALARM REPEAT expansion
Summary
icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python. From 6.1.0 until 7.2.2, vInt.from_ical accepts an attacker-controlled VALARM REPEAT value and applications that request alarm times can eagerly expand it without an application-level limit. Alarms.times and Alarms.active reach the unbounded expansion in versions starting with 6.1.0, while Alarm.triggers adds a second affected path starting with 7.0.0. Parsing alone does not trigger the issue, but accessing these properties can consume excessive CPU time and heap memory and terminate or stall a service. This issue is fixed in version 7.2.2.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 14:10 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-834 - Excessive Iteration
Impacted products
Vendor Product Version
collective icalendar Affected: >= 6.1.0, < 7.2.2
Create a notification for this product.
Show details on NVD website

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CVE-2026-77357 (GCVE-0-2026-77357)

Vulnerability from cvelistv5 – Published: 2026-08-25 20:40 – Updated: 2026-08-26 12:54
VLAI
Title
Mesop: DoS in /hot-reload endpoint allows unauthenticated attacker to exhaust worker threads and crash the server
Summary
Mesop is a Python-based UI framework that allows users to build web applications. Prior to 1.3.3, applications running in debug mode expose a GET /hot-reload endpoint whose unbounded loop depends on the user-supplied counter parameter, allowing an unauthenticated attacker to hold worker threads with high counter values until the worker pool is exhausted and the server becomes unavailable. A single unauthenticated attacker can crash the Mesop server with minimal effort. Because the attack leverages worker exhaustion, the server remains unresponsive until it is manually restarted. This issue is fixed in version 1.3.3.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 12:53 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-834 - Excessive Iteration
Impacted products
Vendor Product Version
mesop-dev mesop Affected: < 1.3.3
Create a notification for this product.
Show details on NVD website

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CVE-2026-71852 (GCVE-0-2026-71852)

Vulnerability from cvelistv5 – Published: 2026-08-07 18:53 – Updated: 2026-08-10 12:03
VLAI
Title
pypdf: Possible long runtimes/large memory usage for large CID font width ranges
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause long runtimes and large memory consumption when pypdf/_font.py function Font._collect_cid_character_widths expands unusually large CID font /W width ranges or excessive width entries during text extraction. This issue is fixed in 6.15.0.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 12:03 UTC
CWE
Impacted products
Vendor Product Version
py-pdf pypdf Affected: < 6.15.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-64641 (GCVE-0-2026-64641)

Vulnerability from cvelistv5 – Published: 2026-07-27 17:40 – Updated: 2026-07-27 18:54
VLAI
Title
Next.js: Denial of Service in App Router using Server Actions
Summary
Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process. This issue has been fixed in versions 15.5.21 and 16.2.11.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 18:54 UTC
CWE
Impacted products
Vendor Product Version
vercel next.js Affected: >= 13.0.0, < 15.5.21
Affected: >= 16.0.0, < 16.2.11
Create a notification for this product.
Show details on NVD website

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CVE-2026-59644 (GCVE-0-2026-59644)

Vulnerability from cvelistv5 – Published: 2026-08-03 00:50 – Updated: 2026-08-03 13:36
VLAI
Title
MLS hash-ratchet honours arbitrary 32-bit generation counter from sender
Summary
In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary 32-bit generation counter from sender.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 13:36 UTC
CWE
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 1.73 , < 1.85 (maven)
Create a notification for this product.
Show details on NVD website

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No mitigation information available for this CWE.

No CAPEC attack patterns related to this CWE.