CWE-134

Use of Externally-Controlled Format String

The product uses a function that accepts a format string as an argument, but the format string originates from an external source.

CVE-2026-33210 (GCVE-0-2026-33210)

Vulnerability from cvelistv5 – Published: 2026-03-20 22:57 – Updated: 2026-03-23 21:41
VLAI
Title
Ruby JSON has a format string injection vulnerability
Summary
Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false parsing option is used to parse user supplied documents. This issue has been patched in versions 2.15.2.1, 2.17.1.2, and 2.19.2.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-134 - Use of Externally-Controlled Format String
Assigner
References
Impacted products
Vendor Product Version
ruby json Affected: >= 2.14.0, < 2.15.2.1
Affected: >= 2.16.0, < 2.17.1.2
Affected: >= 2.18.0, < 2.19.2
Create a notification for this product.
Show details on NVD website
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CVE-2026-3509 (GCVE-0-2026-3509)

Vulnerability from cvelistv5 – Published: 2026-03-24 07:42 – Updated: 2026-03-26 12:35
VLAI
Title
CODESYS Control Audit Log Format String DoS
Summary
An unauthenticated remote attacker may be able to control the format string of messages processed by the Audit Log of the CODESYS Control runtime system, potentially resulting in a denial‑of‑service (DoS) condition.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-134 - Use of Externally-Controlled Format String
Assigner
References
Impacted products
Vendor Product Version
CODESYS CODESYS Control RTE (SL) Affected: 3.5.17.0 , < 3.5.22.0 (semver)
Create a notification for this product.
CODESYS CODESYS Control RTE (for Beckhoff CX) SL Affected: 3.5.17.0 , < 3.5.22.0 (semver)
Create a notification for this product.
CODESYS CODESYS Control Win (SL) Affected: 3.5.17.0 , < 3.5.22.0 (semver)
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CODESYS CODESYS Runtime Toolkit Affected: 3.5.17.0 , < 3.5.22.0 (semver)
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CODESYS CODESYS Control for BeagleBone SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
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CODESYS CODESYS Control for emPC-A/iMX6 SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
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CODESYS CODESYS Control for IOT2000 SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
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CODESYS CODESYS Control for Linux ARM SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
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CODESYS CODESYS Control for Linux SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
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CODESYS CODESYS Control for PFC100 SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
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CODESYS CODESYS Control for PFC200 SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
Create a notification for this product.
CODESYS CODESYS Control for PLCnext SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
Create a notification for this product.
CODESYS CODESYS Control for Raspberry Pi SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
Create a notification for this product.
CODESYS CODESYS Control for WAGO Touch Panels 600 SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
Create a notification for this product.
CODESYS CODESYS Virtual Control SL Affected: 4.1.0.0 , < 4.21.0.0 (semver)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-44407 (GCVE-0-2026-44407)

Vulnerability from cvelistv5 – Published: 2026-05-07 07:33 – Updated: 2026-05-07 13:40
VLAI
Title
Remote Denial of Service Vulnerability Exists in ZTE Cloud PC Client uSmartview
Summary
A remote denial-of-service vulnerability exists in the ZTE Cloud PC client uSmartview, which may lead to memory corruption and remote denial of service.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-134 - Use of Externally-Controlled format string
Assigner
zte
References
Impacted products
Vendor Product Version
ZTE ZXCLOUD iRAI Affected: ZXCLOUD-iRAI-ClientV7.2X
Create a notification for this product.
Credits
Runzi Zhao, Feng Ye and Ziwei Wang
Show details on NVD website
To clipboard 

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CVE-2026-6474 (GCVE-0-2026-6474)

Vulnerability from cvelistv5 – Published: 2026-05-14 13:00 – Updated: 2026-05-14 15:30
VLAI
Title
PostgreSQL timeofday() can disclose portions of server memory
Summary
Externally-controlled format string in PostgreSQL timeofday() function allows an attacker to retrieve portions of server memory, via crafted timezone zones. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-134 - Use of Externally-Controlled Format String
Assigner
References
Impacted products
Vendor Product Version
n/a PostgreSQL Affected: 18 , < 18.4 (rpm)
Affected: 17 , < 17.10 (rpm)
Affected: 16 , < 16.14 (rpm)
Affected: 15 , < 15.18 (rpm)
Affected: 0 , < 14.23 (rpm)
Credits
The PostgreSQL project thanks Xint Code for reporting this problem.
Show details on NVD website
To clipboard 

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CVE-2026-6539 (GCVE-0-2026-6539)

Vulnerability from cvelistv5 – Published: 2026-04-30 20:31 – Updated: 2026-05-01 14:21
VLAI
Title
Notepad++ 8.9.3 Format String Injection via nativeLang.xml
Summary
Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.
Severity
4.6 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-134 - Use of Externally Controlled Format String
Assigner
References
Impacted products
Vendor Product Version
Notepad++ Notepad++ Affected: 0 , < 8.9.4 (semver)
Create a notification for this product.
Credits
Hazley Samsudin
Show details on NVD website
To clipboard 

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CVE-2026-6843 (GCVE-0-2026-6843)

Vulnerability from cvelistv5 – Published: 2026-04-22 08:30 – Updated: 2026-04-22 12:04
VLAI
Title
Nano: nano: format string vulnerability leads to denial of service
Summary
A flaw was found in nano. A local user could exploit a format string vulnerability in the `statusline()` function. By creating a directory with a name containing `printf` specifiers, the application attempts to display this name, leading to a segmentation fault (SEGV). This results in a Denial of Service (DoS) for the `nano` application.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-134 - Use of Externally-Controlled Format String
Assigner
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-6843 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2460017 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2026-04-13 00:00
Credits
Red Hat would like to thank Michał Majchrowicz, Marcin Wyczechowski (AFINE Team) for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2026-7835 (GCVE-0-2026-7835)

Vulnerability from cvelistv5 – Published: 2026-05-21 07:35 – Updated: 2026-05-21 12:14
VLAI
Title
Format string argument mismatch
Summary
A format string argument mismatch in Netatalk 3.0.3 through 4.4.2 allows a remote authenticated attacker to cause a minor denial of service via crafted input that triggers incorrect format string processing.
Severity
3.1 (Low)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-134 - Use of Externally-Controlled Format String
Assigner
References
Impacted products
Vendor Product Version
Netatalk Netatalk Affected: 3.0.3 , ≤ 4.4.2 (semver)
Unaffected: 4.5.0 (semver)
Create a notification for this product.
Date Public
2026-05-13 00:00
Credits
Arjun Basnet from Securin
Show details on NVD website
To clipboard 

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  "dataVersion": "5.2"
}
Mitigation

Phase: Requirements

Description:

  • Choose a language that is not subject to this flaw.
Mitigation

Phase: Implementation

Description:

  • Ensure that all format string functions are passed a static string which cannot be controlled by the user, and that the proper number of arguments are always sent to that function as well. If at all possible, use functions that do not support the %n operator in format strings. [REF-116] [REF-117]
Mitigation

Phase: Build and Compilation

Description:

  • Run compilers and linkers with high warning levels, since they may detect incorrect usage.
CAPEC-135: Format String Injection

An adversary includes formatting characters in a string input field on the target application. Most applications assume that users will provide static text and may respond unpredictably to the presence of formatting character. For example, in certain functions of the C programming languages such as printf, the formatting character %s will print the contents of a memory location expecting this location to identify a string and the formatting character %n prints the number of DWORD written in the memory. An adversary can use this to read or write to memory locations or files, or simply to manipulate the value of the resulting text in unexpected ways. Reading or writing memory may result in program crashes and writing memory could result in the execution of arbitrary code if the adversary can write to the program stack.

CAPEC-67: String Format Overflow in syslog()

This attack targets applications and software that uses the syslog() function insecurely. If an application does not explicitely use a format string parameter in a call to syslog(), user input can be placed in the format string parameter leading to a format string injection attack. Adversaries can then inject malicious format string commands into the function call leading to a buffer overflow. There are many reported software vulnerabilities with the root cause being a misuse of the syslog() function.

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