Common Weakness Enumeration
CWE-134
AllowedUse of Externally-Controlled Format String
Abstraction: Base · Status: Draft
The product uses a function that accepts a format string as an argument, but the format string originates from an external source.
521 vulnerabilities reference this CWE, most recent first.
CVE-2026-68553 (GCVE-0-2026-68553)
Vulnerability from cvelistv5 – Published: 2026-08-19 20:37 – Updated: 2026-08-20 19:48
VLAI
EPSS
VEX
Title
Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command
Summary
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, an authenticated TURN user can place printf-style format specifiers in the STUN USERNAME or REALM attribute, which passes is_secure_string() validation and is embedded into Redis keys at nine call sites in src/apps/relay/ns_ioalib_engine_impl.c. send_message_to_redis() in src/apps/relay/hiredis_libevent2.c then passes the attacker-controlled key as the format argument to redisAsyncCommand() while supplying only one variadic value, causing hiredis redisvFormatCommand() to read past the va_list. Exploitation can crash the coturn process and terminate active TURN sessions or disclose stack memory into Redis. This issue is fixed in version 4.13.0.
Severity
7.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 19:48 UTC
CWE
- CWE-134 - Use of Externally-Controlled Format String
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/coturn/coturn/security/advisor… | x_refsource_CONFIRM |
| https://github.com/coturn/coturn/commit/8fa38032b… | x_refsource_MISC |
| https://github.com/coturn/coturn/releases/tag/4.13.0 | x_refsource_MISC |
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CVE-2026-67244 (GCVE-0-2026-67244)
Vulnerability from cvelistv5 – Published: 2026-07-30 03:04 – Updated: 2026-08-04 07:30
VLAI
EPSS
VEX
Title
A format string vulnerability was found in the Notification OAuth settings of ADM
Summary
A format string vulnerability was found in the Notification OAuth settings of ADM. The vulnerability occurs because user-controlled notification configuration input may be processed through an unsafe format string operation. An authenticated administrator can exploit this issue to disclose memory information or cause denial of service of the affected component.
Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RUN1 as well as from ADM 5.0.0 through ADM 5.1.3.RI81.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-30 13:21 UTC
CWE
- CWE-134 - Use of Externally-Controlled format string
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.asustor.com/security/security_advisor… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ASUSTOR Inc. | ADM |
Affected:
5.0.0 , ≤ 5.1.3.RI81
(custom)
Affected: 4.1.0 , ≤ 4.3.3.RUN1 (custom) |
Date Public
2026-07-30 03:05
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CVE-2026-63073 (GCVE-0-2026-63073)
Vulnerability from cvelistv5 – Published: 2026-08-25 12:59 – Updated: 2026-08-25 12:59
VLAI
EPSS
VEX
Title
Untrusted Sender DN Used as Format String in CMP Response Validation
Summary
Issue summary: OpenSSL CMP response validation passed an unexpected response
sender distinguished name directly as the format string to `ERR_raise_data()`.
Impact summary: A malicious or intercepted CMP endpoint can crash a CMP client
that enforces an expected sender or uses a pinned server certificate whose
subject becomes the default expected sender.
CWE: CWE-134 (Use of Externally-Controlled Format String)
Description: When validating a received CMP message, ossl_cmp_msg_check_update()
converts the peer-supplied sender distinguished name with X509_NAME_oneline()
and passes it directly as the format argument to ERR_raise_data(). Percent
characters survive the conversion, so a sender DN such as "CN=%s%n" reaches
BIO_vsnprintf() as an attacker-controlled format string with no matching variadic
arguments. This path is only reached when the caller configures an expected
sender or pins a server certificate, which is the normal configuration for a
CMP client validating server responses.
Since the attacker controls the format string but none of the variadic
arguments, such specifiers as %s and %n dereference or write through unrelated
stack contents and crash the client. The reliable consequence is a denial of
service, when the response comes from a malicious or intercepted CMP endpoint.
There is no controlled memory write, arbitrary-address read, or reliable path
to remote code execution.
FIPS impact: no
No FIPS modules are affected by this issue, as the CMP protocol
implementation is outside the OpenSSL FIPS module boundary.
Severity
No CVSS data available.
CWE
- CWE-134 - Use of Externally-Controlled Format String
Assigner
References
5 references
Impacted products
Date Public
2026-08-25 11:36
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CVE-2026-57877 (GCVE-0-2026-57877)
Vulnerability from cvelistv5 – Published: 2026-06-26 07:17 – Updated: 2026-06-26 15:42
VLAI
EPSS
VEX
Title
GV-LPC2011/LPC2211 - unauthorized format string vulnerability (vlsvr)
Summary
An unauthenticated
format string vulnerability exists in vlsvr in GeoVision GV-LPC2011 and
GV-LPC2211 V1.12 and earlier. The vulnerability is caused by improper handling
of externally controlled input during log message formatting in the login
processing path. A remote attacker may exploit this vulnerability by sending
crafted login data, potentially causing information disclosure, memory
corruption, or a denial of service.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-26 15:40 UTC
CWE
- CWE-134 - Use of Externally-Controlled format string
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GeoVision Inc. | GV-LPCLPC2011/2211 |
Affected:
1.12
Unaffected: 1.13 cpe:2.3:a:geovision_inc.:gv-lpclpc2011_2211:1.12:*:linux:*:*:*:*:* |
Date Public
2026-06-26 02:55
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CVE-2026-50211 (GCVE-0-2026-50211)
Vulnerability from cvelistv5 – Published: 2026-06-04 07:28 – Updated: 2026-06-04 12:43
VLAI
EPSS
VEX
Title
Exposed Factory Testing App Boundaries
Summary
Leftover engineering diagnostics and factory-level diagnostic software remain exposed on retail builds, giving malicious apps write privileges to internal NVRAM registers.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-04 12:42 UTC
CWE
- CWE-134 - Use of Externally-Controlled Format String
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Acer | Connect M6E 5G Portable WiFi Router |
Affected:
* , ≤ M6E_AI_1.00.000019
(custom)
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CVE-2026-46465 (GCVE-0-2026-46465)
Vulnerability from cvelistv5 – Published: 2026-07-03 13:16 – Updated: 2026-07-06 16:29
VLAI
EPSS
VEX
Summary
Dell PowerProtect Data Domain, versions 7.7.1.0 through 8.7, LTS2026 release version 8.6.1.0 through 8.6.1.10, LTS2025 release version 8.3.1.0 through 8.3.1.30, LTS2024 release versions 7.13.1.0 through 7.13.1.70 contain an use of externally-controlled format string vulnerability. A high privileged attacker with remote access could potentially exploit this vulnerability, leading to Information disclosure and denial of service.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 16:29 UTC
CWE
- CWE-134 - Use of Externally-Controlled Format String
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.dell.com/support/kbdoc/en-us/00048126… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Dell | PowerProtect Data Domain |
Affected:
0 , < 8.8.0.0 or later
(semver)
Affected: 0 , < 8.6.1.20 or later (semver) Affected: 0 , < 8.3.1.40 or later (semver) Affected: 0 , < 7.13.1.80 or later (semver) |
Date Public
2026-07-02 06:30
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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
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-07 13:40 UTC
CWE
- CWE-134 - Use of Externally-Controlled format string
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ZTE | ZXCLOUD iRAI |
Affected:
ZXCLOUD-iRAI-ClientV7.2X
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CVE-2026-33210 (GCVE-0-2026-33210)
Vulnerability from cvelistv5 – Published: 2026-03-20 22:57 – Updated: 2026-08-21 12:13
VLAI
EPSS
VEX
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
9.1 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-23 21:01 UTC
CWE
- CWE-134 - Use of Externally-Controlled Format String
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/ruby/json/security/advisories/… | x_refsource_CONFIRM |
| https://access.redhat.com/security/cve/CVE-2026-33210 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2449871 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:20606 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:20596 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:57565 | vendor-advisoryx_refsource_REDHAT |
Impacted products
11 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 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:4.0.3-34.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
9080020260513131334.9 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
4.0.6-37.2.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
|
|
| Red Hat | Red Hat 3scale API Management Platform 2 |
cpe:/a:redhat:red_hat_3scale_amp:2
|
|
| Red Hat | Red Hat AMQ Clients |
cpe:/a:redhat:amq_clients:2023
|
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Enterprise Linux AI (RHEL AI) 3 |
cpe:/a:redhat:enterprise_linux_ai:3
|
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CVE-2026-22190 (GCVE-0-2026-22190)
Vulnerability from cvelistv5 – Published: 2026-01-07 20:25 – Updated: 2026-07-14 15:53
VLAI
EPSS
VEX
Title
Panda3D <= 1.10.16 egg-mkfont Format String Information Disclosure
Summary
The egg-mkfont utility in Panda3D versions up to and including 1.10.16 contains an uncontrolled format string vulnerability. The -gp (glyph pattern) command-line option is used directly as the format string for sprintf() with only a single argument supplied. If an attacker provides additional format specifiers, egg-mkfont may read unintended stack values and write the formatted output into generated .egg and .png files, resulting in disclosure of stack-resident memory and pointer values.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-07 21:22 UTC
CWE
- CWE-134 - Use of Externally-Controlled Format String
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://seclists.org/fulldisclosure/2026/Jan/11 | technical-descriptionexploit |
| https://www.panda3d.org/ | product |
| https://github.com/panda3d/panda3d | product |
| https://www.vulncheck.com/advisories/panda3d-egg-… | third-party-advisory |
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CVE-2026-18188 (GCVE-0-2026-18188)
Vulnerability from cvelistv5 – Published: 2026-07-30 02:59 – Updated: 2026-08-04 07:27
VLAI
EPSS
VEX
Title
A format string vulnerability was found in the Rsync Backup on the ADM
Summary
A format string vulnerability was found in the Rsync Backup on the ADM. The vulnerability occurs because user-controlled rsync backup configuration or log data may be processed through an unsafe format string operation. An authenticated attacker can exploit this issue to disclose memory information or cause denial of service of the affected backup component.
Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RUN1 as well as from ADM 5.0.0 through ADM 5.1.3.RI81.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-30 13:21 UTC
CWE
- CWE-134 - Use of Externally-Controlled format string
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.asustor.com/security/security_advisor… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ASUSTOR Inc. | ADM |
Affected:
5.0.0 , ≤ 5.1.3.RI81
(custom)
Affected: 4.1.0 , ≤ 4.3.3.RUN1 (custom) |
Date Public
2026-07-30 03:00
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Mitigation
Requirements
Choose a language that is not subject to this flaw.
Mitigation
Implementation
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
Build and Compilation
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.