Common Weakness Enumeration

CWE-457

Allowed

Use of Uninitialized Variable

Abstraction: Variant · Status: Draft

API response cwe.mitre.org

The code uses a variable that has not been initialized, leading to unpredictable or unintended results.

361 vulnerabilities reference this CWE, most recent first.

CVE-2026-109854 (GCVE-0-2026-109854)

Vulnerability from cvelistv5 – Published: 2026-10-13 09:16 – Updated: 2026-10-13 09:16
VLAI
Title
M17n-lib: uninitialized stack read in iso-2022 compound text utf-8 decoding
Summary
A flaw was found in m17n-lib. An attacker who supplies crafted input to an application processing ISO-2022 encoded text can cause the library to read uninitialized memory from the stack. If the application exposes or returns the decoded output, this flaw can result in unexpected behavior and limited information disclosure.
Severity
2.5 (Low)
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
CWE
  • CWE-457 - Use of Uninitialized Variable
Assigner
redhat CNA under the redhat root
CNA scorecard B 81/100 over 987 records in the last 180 days details
References
Impacted products
Date Public
2026-10-13 07:28
Credits
Red Hat would like to thank Chamod Anuradha Denipitiya for reporting this issue.
Show details on NVD website
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CVE-2026-109828 (GCVE-0-2026-109828)

Vulnerability from cvelistv5 – Published: 2026-10-13 17:00 – Updated: 2026-10-13 17:16 X_Open Source
VLAI
Title
libsndfile WAV Parsing wavlike.c wavlike_subchunk_parse uninitialized variable
Summary
A vulnerability was found in libsndfile up to 1.2.2. This issue affects the function wavlike_subchunk_parse of the file src/wavlike.c of the component WAV Parsing. Performing a manipulation results in use of uninitialized variable. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:X/RC:C
4.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:X/RC:C
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 17:15 UTC
CWE
  • CWE-457 - Use of Uninitialized Variable
  • CWE-453 - Insecure Default Variable Initialization
Assigner
VulDB CNA under the mitre root
CNA scorecard B 82/100 over 3876 records in the last 180 days details
References
Impacted products
Vendor Product Version
n/a libsndfile Affected: 1.2.0
Affected: 1.2.1
Affected: 1.2.2
    cpe:2.3:a:libsndfile:libsndfile:*:*:*:*:*:*:*:*
Credits
suyuanwang (VulDB User) VulDB CNA Team
Show details on NVD website
To clipboard 

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CVE-2026-103436 (GCVE-0-2026-103436)

Vulnerability from cvelistv5 – Published: 2026-09-30 15:38 – Updated: 2026-10-02 16:20
VLAI
Summary
apcupsd through 3.14.14 discloses uninitialized stack memory in getupsvar() in src/cgi/upsfetch.c (used by upsstats.cgi, multimon.cgi, and upsfstats.cgi. On the single-field path, when the matched STATUS line has fewer than three whitespace-separated tokens, sscanf("%*s %*s %s", answer) performs no assignment but the function returns success, and thus the caller prints the uninitialized destination buffer into the HTTP response.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 16:20 UTC
CWE
  • CWE-457 - Use of Uninitialized Variable
Assigner
mitre CNA under the mitre root
CNA scorecard E 27/100 over 2308 records in the last 180 days details
References
Impacted products
Vendor Product Version
apcupsd apcupsd Affected: 0 , ≤ 3.14.14 (semver)
    cpe:2.3:a:apcupsd:apcupsd:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-102717 (GCVE-0-2026-102717)

Vulnerability from cvelistv5 – Published: 2026-09-30 14:31 – Updated: 2026-09-30 20:00
VLAI
Title
MQTT WebSocket setter ABI mismatch may disclose memory or cause a crash
Summary
MQTT WebSocket setter ABI mismatch may disclose memory or cause a crash
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:59 UTC
CWE
  • CWE-125 - Out-of-bounds Read
  • CWE-457 - Use of Uninitialized Variable
Assigner
eclipse CNA under the mitre root
CNA scorecard C 64/100 over 113 records in the last 180 days details
References
Impacted products
Vendor Product Version
Eclipse Foundation NetX Duo Affected: 6.4.4 , ≤ 6.5.1.202602 (semver)
Unaffected: 6.5.2.202603
Create a notification for this product.
Credits
fdesbiens
Show details on NVD website
To clipboard 

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CVE-2026-91963 (GCVE-0-2026-91963)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-15 15:58
VLAI
Title
FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure via urbdrc
Summary
FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 15:56 UTC
CWE
  • CWE-457 - Use of Uninitialized Variable
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 5953 records in the last 180 days details
References
Impacted products
Vendor Product Version
FreeRDP FreeRDP Affected: 2.0.0 , < 3.0.0 (semver)
Affected: 3.0.0 , < 3.31.0 (semver)
Unaffected: 3.31.0 (semver)
Create a notification for this product.
FreeRDP FreeRDP Affected: 0 , < 3.31.0 (semver)
Unaffected: 3.31.0 (semver)
Create a notification for this product.
Date Public
2026-09-01 00:00
Credits
iarce-qb
Show details on NVD website
To clipboard 

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CVE-2026-84391 (GCVE-0-2026-84391)

Vulnerability from cvelistv5 – Published: 2026-09-08 16:41 – Updated: 2026-09-08 17:29
VLAI
Summary
A use of uninitialized variable vulnerability in Fortinet FortiAnalyzer 7.6.3 through 7.6.6 may allow attacker to denial of service via <insert attack vector here>
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 17:29 UTC
CWE
Assigner
fortinet CNA under the mitre root
CNA scorecard C 72/100 over 56 records in the last 180 days details
References
Impacted products
Vendor Product Version
Fortinet FortiAnalyzer Affected: 7.6.3 , ≤ 7.6.6 (semver)
    cpe:2.3:o:fortinet:fortianalyzer:7.6.6:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortianalyzer:7.6.5:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortianalyzer:7.6.4:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortianalyzer:7.6.3:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-76919 (GCVE-0-2026-76919)

Vulnerability from cvelistv5 – Published: 2026-08-19 22:45 – Updated: 2026-09-17 18:47
VLAI
Title
Use of Uninitialized Variable in Wireshark
Summary
ESS protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/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 2026-08-20 15:07 UTC
CWE
  • CWE-457 - Use of Uninitialized Variable
Assigner
GitLab CNA under the mitre root
CNA scorecard C 75/100 over 312 records in the last 180 days details
References
Impacted products
Vendor Product Version
Wireshark Foundation Wireshark Affected: 4.6.0 , < 4.6.8 (semver)
Affected: 4.4.0 , < 4.4.18 (semver)
Create a notification for this product.
Credits
Aisle Research (Dmitrijs Trizna, Luigino Camastra, Ze Sheng (O2Lab & TAMU), Igor Morgenstern)
Show details on NVD website
To clipboard 

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CVE-2026-66859 (GCVE-0-2026-66859)

Vulnerability from cvelistv5 – Published: 2026-10-02 12:23 – Updated: 2026-10-02 16:55
VLAI
Title
Apache Thrift: c_glib multiplexed processor crashes on a message it cannot route
Summary
NULL Pointer Dereference, Use of Uninitialized Variable vulnerability in Apache Thrift c_glib bindings. This issue affects Apache Thrift: before 0.25.0. Users are recommended to upgrade to version 0.25.0, which fixes the issue.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 16:55 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
  • CWE-457 - Use of Uninitialized Variable
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 936 records in the last 180 days details
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Thrift Affected: 0 , < 0.25.0 (semver)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-62986 (GCVE-0-2026-62986)

Vulnerability from cvelistv5 – Published: 2026-08-25 18:27 – Updated: 2026-08-25 19:20
VLAI
Title
OpenEXR: PyOpenEXR deep prefixed RGB stale lane disclosure
Summary
OpenEXR is the reference implementation and specification for the EXR image file format, widely used in the motion picture industry. In versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13, the PyOpenEXR Python bindings return stale heap data when reading a crafted deep scanline EXR that uses layer-prefixed RGB channels. With the default channel coalescing (separate_channels=False), the wrapper groups channels such as left.R, left.G, and left.B into a single RGB sample array, but the lane-offset calculation in PyPart::setDeepSliceData() only recognizes the exact unprefixed names G, B, and A. As a result, prefixed channels like left.G and left.B are decoded into lane 0 while lanes 1 and 2 are left uninitialized and returned to Python. A Python application that reads untrusted deep EXR files through the default OpenEXR.File API and then logs, serializes, previews, or otherwise processes the resulting NumPy sample arrays may expose uninitialized same-process heap contents, in addition to receiving incorrect green and blue channel data. This issue is fixed in versions 3.3.13 and 3.4.14.
Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 19:19 UTC
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-457 - Use of Uninitialized Variable
  • CWE-908 - Use of Uninitialized Resource
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7625 records in the last 180 days details
References
Impacted products
Vendor Product Version
AcademySoftwareFoundation openexr Affected: >= 3.3.0, < 3.3.13
Affected: >= 3.4.0, < 3.4.14
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-55990 (GCVE-0-2026-55990)

Vulnerability from cvelistv5 – Published: 2026-07-22 13:10 – Updated: 2026-07-22 14:04
VLAI
Title
Packet of death for a DNSCrypt misconfigured Unbound
Summary
In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the 'dnscrypt:' clause lists more 'dnscrypt-provider-cert:' files than there are matching 'dnscrypt-secret-key:' files, Unbound fills only the matched prefix and leaves the tail slots at the '0xdb' fill that libsodium's allocator writes into every allocation. Unbound would then iterate over the number of cert files, not the actual slots, so it walks into a slot with garbage data filled with '0xdb' bytes. Any unauthenticated client that sends one UDP datagram of ≥ 68 bytes whose first 8 bytes are '0xdb' to 'dnscrypt-port' will use that garbage entry which leads to a garbage dereference killing the server. This is a silent faulty configuration that goes unnoticed until triggered with the right client query. Unbound needs to be compiled with DNSCrypt support ('--enable-dnscrypt').
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 2026-07-22 14:04 UTC
CWE
  • CWE-457 - Use of Uninitialized Variable
Assigner
NLnet Labs CNA
CNA scorecard B 82/100 over 57 records in the last 180 days details
References
Impacted products
Vendor Product Version
NLnet Labs Unbound Affected: 1.7.0 , < 1.25.2 (semver)
Create a notification for this product.
Date Public
2026-07-22 00:00
Credits
Qifan Zhang (Palo Alto Networks)
Show details on NVD website
To clipboard 

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Mitigation MIT-57
Implementation

Strategy: Attack Surface Reduction

Ensure that critical variables are initialized before first use [REF-1485].

Mitigation
Build and Compilation

Strategy: Compilation or Build Hardening

Most compilers will complain about the use of uninitialized variables if warnings are turned on.

Mitigation
Implementation Operation

When using a language that does not require explicit declaration of variables, run or compile the software in a mode that reports undeclared or unknown variables. This may indicate the presence of a typographic error in the variable's name.

Mitigation
Requirements

Strategy: Language Selection

Choose a language that is not susceptible to these issues.

Mitigation
Architecture and Design

Mitigating technologies such as safe string libraries and container abstractions could be introduced.

No CAPEC attack patterns related to this CWE.

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