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Common Weakness Enumeration

CWE-407

Allowed-with-Review

Inefficient Algorithmic Complexity

Abstraction: Class · Status: Incomplete

An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

279 vulnerabilities reference this CWE, most recent first.

CVE-2026-3988 (GCVE-0-2026-3988)

Vulnerability from cvelistv5 – Published: 2026-03-25 16:33 – Updated: 2026-03-25 17:21
VLAI
Title
Inefficient Algorithmic Complexity in GitLab
Summary
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-25 17:21 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Impacted products
Vendor Product Version
GitLab GitLab Affected: 18.5 , < 18.8.7 (semver)
Affected: 18.9 , < 18.9.3 (semver)
Affected: 18.10 , < 18.10.1 (semver)
    cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
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CVE-2026-3276 (GCVE-0-2026-3276)

Vulnerability from cvelistv5 – Published: 2026-06-03 14:29 – Updated: 2026-08-13 00:28
VLAI
Title
Potential DoS via quadratic complexity in unicodedata.normalize()
Summary
unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-03 17:27 UTC
CWE
Assigner
Impacted products
Vendor Product Version
Python Software Foundation CPython Affected: 0 , < 3.10.21 (python)
Affected: 3.11.0 , < 3.11.16 (python)
Affected: 3.12.0 , < 3.12.14 (python)
Affected: 3.13.0 , < 3.13.14 (python)
Affected: 3.14.0 , < 3.14.6 (python)
Affected: 3.15.0a1 , < 3.15.0b2 (python)
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CVE-2026-1285 (GCVE-0-2026-1285)

Vulnerability from cvelistv5 – Published: 2026-02-03 14:35 – Updated: 2026-02-03 16:22
VLAI
Title
Potential denial-of-service vulnerability in django.utils.text.Truncator HTML methods
Summary
An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28. `django.utils.text.Truncator.chars()` and `Truncator.words()` methods (with `html=True`) and the `truncatechars_html` and `truncatewords_html` template filters allow a remote attacker to cause a potential denial-of-service via crafted inputs containing a large number of unmatched HTML end tags. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-03 16:22 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Assigner
Impacted products
Vendor Product Version
djangoproject Django Affected: 6.0 , < 6.0.2 (semver)
Unaffected: 6.0.2 (semver)
Affected: 5.2 , < 5.2.11 (semver)
Unaffected: 5.2.11 (semver)
Affected: 4.2 , < 4.2.28 (semver)
Unaffected: 4.2.28 (semver)
Create a notification for this product.
Date Public
2026-02-03 08:00
Show details on NVD website

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CVE-2025-66382 (GCVE-0-2025-66382)

Vulnerability from cvelistv5 – Published: 2025-11-28 00:00 – Updated: 2026-07-14 12:43
VLAI
Summary
In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-03 16:08 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Impacted products
Show details on NVD website

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CVE-2025-64460 (GCVE-0-2025-64460)

Vulnerability from cvelistv5 – Published: 2025-12-02 15:15 – Updated: 2025-12-02 21:54
VLAI
Title
Potential denial-of-service vulnerability in XML serializer text extraction
Summary
An issue was discovered in 5.2 before 5.2.9, 5.1 before 5.1.15, and 4.2 before 4.2.27. Algorithmic complexity in `django.core.serializers.xml_serializer.getInnerText()` allows a remote attacker to cause a potential denial-of-service attack triggering CPU and memory exhaustion via specially crafted XML input processed by the XML `Deserializer`. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-02 21:53 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Assigner
Impacted products
Vendor Product Version
djangoproject Django Affected: 5.2 , < 5.2.9 (semver)
Unaffected: 5.2.9 (semver)
Affected: 5.1 , < 5.1.15 (semver)
Unaffected: 5.1.15 (semver)
Affected: 4.2 , < 4.2.27 (semver)
Unaffected: 4.2.27 (semver)
Create a notification for this product.
Date Public
2025-12-02 14:00
Show details on NVD website

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CVE-2025-64458 (GCVE-0-2025-64458)

Vulnerability from cvelistv5 – Published: 2025-11-05 15:07 – Updated: 2025-11-05 16:20
VLAI
Title
Potential denial-of-service vulnerability in HttpResponseRedirect and HttpResponsePermanentRedirect on Windows
Summary
An issue was discovered in 5.1 before 5.1.14, 4.2 before 4.2.26, and 5.2 before 5.2.8. NFKC normalization in Python is slow on Windows. As a consequence, `django.http.HttpResponseRedirect`, `django.http.HttpResponsePermanentRedirect`, and the shortcut `django.shortcuts.redirect` were subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-11-05 16:20 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Assigner
Impacted products
Vendor Product Version
djangoproject Django Affected: 5.2 , < 5.2.8 (semver)
Unaffected: 5.2.8 (semver)
Affected: 5.1 , < 5.1.14 (semver)
Unaffected: 5.1.14 (semver)
Affected: 4.2 , < 4.2.26 (semver)
Unaffected: 4.2.26 (semver)
Create a notification for this product.
Date Public
2025-11-05 14:00
Show details on NVD website

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CVE-2025-62727 (GCVE-0-2025-62727)

Vulnerability from cvelistv5 – Published: 2025-10-28 20:14 – Updated: 2025-11-04 17:41
VLAI
Title
Starlette vulnerable to O(n^2) DoS via Range header merging in starlette.responses.FileResponse
Summary
Starlette is a lightweight ASGI framework/toolkit. Starting in version 0.39.0 and prior to version 0.49.1 , an unauthenticated attacker can send a crafted HTTP Range header that triggers quadratic-time processing in Starlette's FileResponse Range parsing/merging logic. This enables CPU exhaustion per request, causing denial‑of‑service for endpoints serving files (e.g., StaticFiles or any use of FileResponse). This vulnerability is fixed in 0.49.1.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-28 20:36 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Impacted products
Vendor Product Version
Kludex starlette Affected: >= 0.39.0, < 0.49.1
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CVE-2025-55304 (GCVE-0-2025-55304)

Vulnerability from cvelistv5 – Published: 2025-08-29 15:00 – Updated: 2025-08-29 15:27
VLAI
Title
Exiv2 has quadratic performance in ICC profile parsing in JpegBase::readMetadata
Summary
Exiv2 is a C++ library and a command-line utility to read, write, delete and modify Exif, IPTC, XMP and ICC image metadata. A denial-of-service was found in Exiv2 version 0.28.5: a quadratic algorithm in the ICC profile parsing code in jpegBase::readMetadata() can cause Exiv2 to run for a long time. The denial-of-service is triggered when Exiv2 is used to read the metadata of a crafted jpg image file. The bug is fixed in version 0.28.6.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-29 15:26 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Impacted products
Vendor Product Version
Exiv2 exiv2 Affected: < 0.28.6
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CVE-2025-30348 (GCVE-0-2025-30348)

Vulnerability from cvelistv5 – Published: 2025-03-21 00:00 – Updated: 2025-03-21 15:51
VLAI
Summary
encodeText in QDom in Qt before 6.8.0 has a complex algorithm involving XML string copy and inline replacement of parts of a string (with relocation of later data).
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-21 15:51 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Impacted products
Vendor Product Version
Qt Qt Affected: 0 , < 5.15.19 (semver)
Affected: 6.0.0 , < 6.5.9 (semver)
Affected: 6.6.0 , < 6.8.0 (semver)
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CVE-2025-29908 (GCVE-0-2025-29908)

Vulnerability from cvelistv5 – Published: 2025-03-31 18:43 – Updated: 2025-04-01 13:50
VLAI
Title
Netty QUIC hash collision DoS attack
Summary
Netty QUIC codec is a QUIC codec for netty which makes use of quiche. An issue was discovered in the codec. A hash collision vulnerability (in the hash map used to manage connections) allows remote attackers to cause a considerable CPU load on the server (a Hash DoS attack) by initiating connections with colliding Source Connection IDs (SCIDs). This vulnerability is fixed in 0.0.71.Final.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-31 21:07 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Impacted products
Vendor Product Version
netty netty-incubator-codec-quic Affected: < 0.0.71.Final
Create a notification for this product.
Show details on NVD website

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        },
        {
          "name": "https://github.com/netty/netty-incubator-codec-quic/commit/e059bd9b78723f8b035e0c547e42ce263f03461c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/netty/netty-incubator-codec-quic/commit/e059bd9b78723f8b035e0c547e42ce263f03461c"
        },
        {
          "name": "https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory"
        }
      ],
      "source": {
        "advisory": "GHSA-hqqc-jr88-p6x2",
        "discovery": "UNKNOWN"
      },
      "title": "Netty QUIC hash collision DoS attack"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-29908",
    "datePublished": "2025-03-31T18:43:44.172Z",
    "dateReserved": "2025-03-12T13:42:22.134Z",
    "dateUpdated": "2025-04-01T13:50:43.647Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

No mitigation information available for this CWE.

No CAPEC attack patterns related to this CWE.