Common Weakness Enumeration

CWE-124

Allowed

Buffer Underwrite ('Buffer Underflow')

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

The product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer.

80 vulnerabilities reference this CWE, most recent first.

CVE-2026-109964 (GCVE-0-2026-109964)

Vulnerability from cvelistv5 – Published: 2026-10-13 13:35 – Updated: 2026-10-13 16:43
VLAI
Title
ImageMagick before 7.1.2-33 and 6.9.13-58 Heap Buffer Underwrite in PICT Decoder
Summary
ImageMagick before 7.1.2-33 and 6.9.13-58 contains a heap buffer underwrite vulnerability in DecodeImage() in coders/pict.c on 32-bit builds due to pointer arithmetic overflow. Attackers can supply a crafted PICT file with maximized row, column and bytes-per-line values to bypass bounds checks and write up to 128 controlled bytes below the heap buffer, causing crashes or code execution.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
5.6 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 15:47 UTC
CWE
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6413 records in the last 180 days details
References
Impacted products
Vendor Product Version
ImageMagick ImageMagick Affected: 7.0.0-0 , < 7.1.2-33 (custom)
Affected: 0 , < 6.9.13-58 (custom)
    cpe:2.3:a:imagemagick:imagemagick:*:*:*:*:*:*:*:*
    cpe:2.3:a:imagemagick:imagemagick:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-29 00:00
Credits
idoprog
Show details on NVD website
To clipboard 

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CVE-2026-109448 (GCVE-0-2026-109448)

Vulnerability from cvelistv5 – Published: 2026-10-12 17:42 – Updated: 2026-10-16 17:48
VLAI
Title
psqlODBC SQLBindParameter heap memory corruption when binding more than 32767 parameters
Summary
Integer wraparound in psqlODBC SQLBindParameter allows an application, or an attacker who controls how many parameters the application binds on one statement, to corrupt heap memory. psqlODBC stores the binding count in a signed 16-bit field. Binding parameter number 32768 wraps that count to -32768. Binding parameter 32769 then writes about 2.5 MB of zeros starting 1.25 MB before the binding array, which crashes the application or leaves it running on a corrupted heap. Applications that build parameter lists from untrusted input, such as an IN (?, ?, ...) list, are exposed. Versions before psqlODBC 18.00.0005 are affected.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 17:48 UTC
CWE
  • CWE-190 - Integer Overflow or Wraparound
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
PostgreSQL CNA under the redhat root
CNA scorecard C 67/100 over 88 records in the last 180 days details
References
Impacted products
Vendor Product Version
PostgreSQL psqlODBC Affected: 08.01.0102 , < 18.00.0005 (custom)
Create a notification for this product.
Credits
vltr Richard Kuesters
Show details on NVD website
To clipboard 

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CVE-2026-97008 (GCVE-0-2026-97008)

Vulnerability from cvelistv5 – Published: 2026-10-13 19:01 – Updated: 2026-10-16 23:25
VLAI
Title
Microsoft Office Excel Remote Code Execution Vulnerability
Summary
Buffer underwrite ('buffer underflow') in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 19:37 UTC
CWE
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
microsoft CNA under the mitre root
CNA scorecard B 82/100 over 3957 records in the last 180 days details
References
Impacted products
Vendor Product Version
Microsoft Microsoft 365 Apps for Enterprise Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Create a notification for this product.
Microsoft Microsoft Office 365 for Mac Affected: 1.0.0 , < 16.114.26101123 (custom)
Create a notification for this product.
Microsoft Microsoft Office LTSC 2021 Affected: 16.0.1 , < 16.0.14334.20974 (custom)
Create a notification for this product.
Microsoft Microsoft Office LTSC 2024 Affected: 16.0.0 , < 16.0.17932.21056 (custom)
Create a notification for this product.
Microsoft Microsoft Office LTSC for Mac 2021 Affected: 16.0.1 , < 16.114.26101123 (custom)
Create a notification for this product.
Microsoft Microsoft Office LTSC for Mac 2024 Affected: 16.0.0 , < 16.114.26101123 (custom)
Create a notification for this product.
Microsoft Office Online Server Affected: 16.0.0.0 , < 16.0.10417.20228 (custom)
Create a notification for this product.
Date Public
2026-10-13 14:00
Show details on NVD website
To clipboard 

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CVE-2026-73075 (GCVE-0-2026-73075)

Vulnerability from cvelistv5 – Published: 2026-08-11 15:36 – Updated: 2026-08-11 18:31
VLAI
Title
Vim: Out-of-bounds Access in Popup Opacity Handling
Summary
Vim is an open source, command line text editor. From 9.2.0469 until 9.2.0843, popup_mark_opacity_zindex() in src/popupwin.c can use a negative w_winrow for a text-property-anchored popup with clipwindow and opacity, indexing before the screen array instead of accounting for w_popup_topoff and causing an out-of-bounds read and conditional write. This issue is fixed in version 9.2.0843.
Severity
4.6 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 18:31 UTC
CWE
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
  • CWE-125 - Out-of-bounds Read
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7756 records in the last 180 days details
References
Impacted products
Vendor Product Version
vim vim Affected: >= 9.2.0469, < 9.2.0843
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-71969 (GCVE-0-2026-71969)

Vulnerability from cvelistv5 – Published: 2026-08-10 18:18 – Updated: 2026-08-17 19:00 X_Open Source
VLAI
Title
OP-TEE OS 4.10.0 Buffer Underwrite via RSA NOPAD Encrypt/Decrypt Operations
Summary
OP-TEE OS through 4.10.0, fixed in commit 7b8b494, contains a buffer underwrite vulnerability in the RSA NOPAD encrypt and decrypt operations within the mbedTLS software backend and SE050 hardware driver that allows a malicious Trusted Application to corrupt secure-world heap memory by supplying an input length exceeding the RSA modulus size. When src_len exceeds rsa_len, the subtraction expression wraps to a large unsigned value, causing a subsequent memcpy to write attacker-controlled data before the destination buffer in S-EL1 secure-world heap memory.
Severity
8.4 (High)
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
6.7 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 19:47 UTC
CWE
  • CWE-787 - Out-of-bounds Write
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6413 records in the last 180 days details
References
Impacted products
Vendor Product Version
OP-TEE optee_os Affected: 0 , ≤ 4.10.0 (semver)
Unaffected: 7b8b494e0a324cefec8ed386b7de413b44f1aaf3 (git)
    cpe:2.3:o:op-tee:op-tee_os:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-30 00:00
Credits
Ramtine Tofighi Shirazi (Secmate.dev) Argus Systems - ByteRay Ltd.
Show details on NVD website
To clipboard 

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CVE-2026-44631 (GCVE-0-2026-44631)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:19 – Updated: 2026-06-08 22:32
VLAI
Title
Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow
Summary
Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-08 19:43 UTC
CWE
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 943 records in the last 180 days details
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Affected: 2.4.0 , ≤ 2.4.67 (semver)
Create a notification for this product.
Credits
Zhenpeng (Leo) Lin at depthfirst Bartlomiej Dmitruk
Show details on NVD website
To clipboard 

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CVE-2026-41499 (GCVE-0-2026-41499)

Vulnerability from cvelistv5 – Published: 2026-04-29 18:01 – Updated: 2026-04-29 18:31
VLAI
Title
Wazuh: Multiple Heap-based NULL WRITE Buffer Underflows in parse_uname_string()
Summary
Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 4.0.0 to before version 4.14.4, multiple heap-based out-of-bounds WRITE vulnerabilities exist in parse_uname_string() (remoted_op.c). This function processes OS identification data from agents and contains a dangerous code pattern that appears in 4 locations within the same function: writing to strlen(ptr) - 1 without checking for empty strings. When the string is empty, strlen() returns 0, and 0 - 1 wraps to SIZE_MAX due to unsigned integer underflow. Due to pointer arithmetic wrapping, SIZE_MAX effectively becomes -1, causing a write exactly 1 byte before the allocated buffer. This corrupts heap metadata (e.g., the chunk size field in glibc malloc), leading to heap corruption. This issue has been patched in version 4.14.4.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-29 18:31 UTC
CWE
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
  • CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7756 records in the last 180 days details
References
Impacted products
Vendor Product Version
wazuh wazuh Affected: >= 4.0.0, < 4.14.4
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Show details on NVD website
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CVE-2026-40013 (GCVE-0-2026-40013)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:12 – Updated: 2026-08-28 15:54
VLAI
Summary
An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script. This causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for script management. This might be able to be used for remote code execution. Disable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version. No publicly available exploits are known.
Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 14:32 UTC
CWE
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
OX CNA under the mitre root
CNA scorecard C 61/100 over 74 records in the last 180 days details
References
Impacted products
Vendor Product Version
Open-Xchange GmbH OX Dovecot Pro Affected: 2.3.0 , < 2.3.22.2 (semver)
Affected: 3.0.0 , < 3.0.7 (semver)
Affected: 3.1.0 , < 3.1.6 (semver)
Create a notification for this product.
Open-Xchange GmbH OX Dovecot CE Affected: 2.3.0 , < 2.4.5 (semver)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-28419 (GCVE-0-2026-28419)

Vulnerability from cvelistv5 – Published: 2026-02-27 22:02 – Updated: 2026-03-02 21:54
VLAI
Title
Vim has Heap-based Buffer Underflow in Emacs tags parsing
Summary
Vim is an open source, command line text editor. Prior to version 9.2.0075, a heap-based buffer underflow exists in Vim's Emacs-style tags file parsing logic. When processing a malformed tags file where a delimiter appears at the start of a line, Vim attempts to read memory immediately preceding the allocated buffer. Version 9.2.0075 fixes the issue.
Severity
5.3 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-02 21:54 UTC
CWE
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
  • CWE-125 - Out-of-bounds Read
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7756 records in the last 180 days details
References
Impacted products
Vendor Product Version
vim vim Affected: < 9.2.0075
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-26204 (GCVE-0-2026-26204)

Vulnerability from cvelistv5 – Published: 2026-04-29 17:43 – Updated: 2026-04-30 12:48
VLAI
Title
Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData
Summary
Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 1.0.0 to before version 4.14.4, a heap-based out-of-bounds WRITE occurs in GetAlertData, resulting in writing a NULL byte exactly 1 byte before the start of the buffer allocated by strdup. Due to unsigned integer underflow and pointer arithmetic wrapping, the write lands at offset -1 from the buffer, corrupting heap metadata. A malicious actor can potentially leverage this issue through a compromised agent to cause denial of service or heap corruption by injecting a specially crafted alert into the alerts log file monitored by wazuh-logcollector. This issue has been patched in version 4.14.4.
Severity
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-30 12:48 UTC
CWE
  • CWE-124 - Buffer Underwrite ('Buffer Underflow')
  • CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7756 records in the last 180 days details
References
Impacted products
Vendor Product Version
wazuh wazuh Affected: >= 1.0.0, < 4.14.4
Create a notification for this product.
Show details on NVD website
To clipboard 

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            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857"
        },
        {
          "name": "https://github.com/wazuh/wazuh/releases/tag/v4.14.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wazuh/wazuh/releases/tag/v4.14.4"
        }
      ],
      "source": {
        "advisory": "GHSA-j4c7-hwjw-8857",
        "discovery": "UNKNOWN"
      },
      "title": "Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-26204",
    "datePublished": "2026-04-29T17:43:44.911Z",
    "dateReserved": "2026-02-11T19:56:24.814Z",
    "dateUpdated": "2026-04-30T12:48:18.639Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}
Mitigation
Requirements

Choose a language that is not susceptible to these issues.

Mitigation
Implementation

All calculated values that are used as index or for pointer arithmetic should be validated to ensure that they are within an expected range.

No CAPEC attack patterns related to this CWE.

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