Common Weakness Enumeration
CWE-191
Weakness AllowedInteger Underflow (Wrap or Wraparound)
Abstraction: Base · Status: Draft
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
This can happen in signed and unsigned cases.
Mapping guidance
This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.
Modes of introduction
Implementation
Detection methods
Automated Static Analysis
Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)
Effectiveness: High
Content history
Submission: PLOVER
· 2006-07-19
· CWE Draft 3
Modification: Eric Dalci
· Cigital
· 2008-07-01
· CWE 1.0
updated Demonstrative_Example
Modification: CWE Content Team
· MITRE
· 2008-09-08
· CWE 1.0
updated Alternate_Terms, Applicable_Platforms, Relationships, Taxonomy_Mappings
Modification: CWE Content Team
· MITRE
· 2008-10-14
· CWE 1.0.1
updated Description
Modification: CWE Content Team
· MITRE
· 2009-05-27
· CWE 1.4
updated Demonstrative_Examples
Modification: CWE Content Team
· MITRE
· 2011-06-01
· CWE 1.13
updated Common_Consequences
Modification: CWE Content Team
· MITRE
· 2011-06-27
· CWE 2.0
updated Common_Consequences
Modification: CWE Content Team
· MITRE
· 2012-05-11
· CWE 2.2
updated Common_Consequences, References, Relationships
Modification: CWE Content Team
· MITRE
· 2014-07-30
· CWE 2.8
updated Demonstrative_Examples, Relationships, Taxonomy_Mappings
Modification: CWE Content Team
· MITRE
· 2015-12-07
· CWE 2.9
updated Relationships
Modification: CWE Content Team
· MITRE
· 2017-11-08
· CWE 3.0
updated Taxonomy_Mappings
Modification: CWE Content Team
· MITRE
· 2019-01-03
· CWE 3.2
updated Relationships
Modification: CWE Content Team
· MITRE
· 2020-02-24
· CWE 4.0
updated Relationships
Modification: CWE Content Team
· MITRE
· 2021-03-15
· CWE 4.4
updated Demonstrative_Examples
Modification: CWE Content Team
· MITRE
· 2022-04-28
· CWE 4.7
updated Research_Gaps
Modification: CWE Content Team
· MITRE
· 2023-04-27
· CWE 4.11
updated Detection_Factors, Relationships
Modification: CWE Content Team
· MITRE
· 2023-06-29
· CWE 4.12
updated Mapping_Notes
Modification: CWE Content Team
· MITRE
· 2025-12-11
· CWE 4.19
updated Weakness_Ordinalities
Modification: CWE Content Team
· MITRE
· 2026-10-28
· CWE 5.0
updated Applicable_Platforms, References, Relationships, Taxonomy_Mappings
914 vulnerabilities reference this CWE, most recent first.
CVE-2026-122992 (GCVE-0-2026-122992)
Vulnerability from cvelistv5 – Published: 2026-11-05 02:36 – Updated: 2026-11-05 02:36
VLAI
EPSS
VEX
Summary
In G4KLX DStarGateway and F4FXL DStarGateway before 7b75de6, dstarCallsignToAPRS in APRSUtils.cpp has an integer underflow via an empty RS-MS1A sender field.
Severity
CWE
- CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| G4KLX | DStarGateway |
Affected:
bd3b8650c41d3537c2af1d2d32dcb5b9f2a1a754 , < 7b75de605dca542a2953dd74c16f0eac96a8944e
(git)
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CVE-2026-121727 (GCVE-0-2026-121727)
Vulnerability from cvelistv5 – Published: 2026-11-03 22:55 – Updated: 2026-11-03 22:55
VLAI
EPSS
VEX
Title
Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv()
Summary
Kore before 4.3.0 contains an integer underflow vulnerability in HTTP request body handling that allows unauthenticated attackers to bypass http_body_max by sending more body bytes than declared. Attackers can send oversized first segments over many concurrent POST, PUT or DELETE connections, wrapping content_length to grow buffers unbounded and exhaust worker memory.
Severity
CWE
- CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/jorisvink/kore/commit/1ff3c0f6… | patch |
| https://github.com/jorisvink/kore | product |
| https://kore.io/releases/4.3.0 | release-notes |
| https://github.com/jorisvink/kore/blob/4.3.0-rc5/… | technical-description |
| https://www.vulncheck.com/advisories/kore-before-… | third-party-advisory |
Date Public
2026-09-02 00:00
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CVE-2026-120060 (GCVE-0-2026-120060)
Vulnerability from cvelistv5 – Published: 2026-11-02 19:09 – Updated: 2026-11-02 19:43
VLAI
EPSS
VEX
Title
psqlODBC does not validate server-supplied counts and lengths
Summary
psqlODBC trusts counts and lengths in server data in three places. SQLBulkOperations uses a server-supplied row count in a size subtraction that can underflow. SQLStatistics iterates index keys using a server-supplied key count without bounding it to the fixed storage. Bytea octal decoding reads up to two bytes past the end of a truncated escape sequence. A server not trusted under current SSL settings can crash the client or make it read out of bounds. Versions before psqlODBC 18.00.0006 are affected.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 19:21 UTC
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/postgresql-interfaces/psqlodbc… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| PostgreSQL | psqlODBC |
Affected:
0 , < 18.00.0006
(custom)
|
Date Public
2026-11-02 00:00
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CVE-2026-120058 (GCVE-0-2026-120058)
Vulnerability from cvelistv5 – Published: 2026-11-02 19:09 – Updated: 2026-11-02 19:33
VLAI
EPSS
VEX
Title
psqlODBC row cache overflow when a later FETCH changes the column count
Summary
psqlODBC sizes its row cache from the column count of a cursor's first result, but recomputes the column count from each later FETCH reply without checking that it matches. A server not trusted under current SSL settings can answer a later FETCH with more columns and make the driver write tuple records past the end of the heap allocation. A keyset reply with fewer columns than the key fields also underflows the unsigned field count. This is reachable with UseDeclareFetch enabled. Versions before psqlODBC 18.00.0006 are affected.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 19:33 UTC
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/postgresql-interfaces/psqlodbc… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| PostgreSQL | psqlODBC |
Affected:
0 , < 18.00.0006
(custom)
|
Date Public
2026-11-02 00:00
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CVE-2026-112010 (GCVE-0-2026-112010)
Vulnerability from cvelistv5 – Published: 2026-10-18 11:38 – Updated: 2026-10-18 12:23
VLAI
EPSS
VEX
Title
smpeg through 2.0.0 Integer Underflow via stream_header in MPEGsystem.cpp
Summary
smpeg through 2.0.0 contains an integer underflow vulnerability in stream_header() in MPEGsystem.cpp that allows attackers to wrap packet_size by declaring an undersized packet length. Attackers can supply a crafted MPEG file opened via SMPEG_new, SMPEG_new_rwops or SMPEG_new_data to trigger a reachable assertion or out-of-bounds copy, crashing the application.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-18 12:16 UTC
CWE
- CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://hackmd.io/@haindpwn/smpeg-system-header-s… | technical-descriptionexploit |
| https://github.com/icculus/smpeg/blob/d188dc111f4… | technical-description |
| https://github.com/icculus/smpeg/blob/d188dc111f4… | technical-description |
| https://github.com/icculus/smpeg | product |
| https://www.vulncheck.com/advisories/smpeg-throug… | third-party-advisory |
Date Public
2026-10-17 00:00
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CVE-2026-111881 (GCVE-0-2026-111881)
Vulnerability from cvelistv5 – Published: 2026-10-17 18:46 – Updated: 2026-10-19 21:29
VLAI
EPSS
VEX
Title
FreeRDP 3.14.1 before 3.32.0 Integer Underflow in BMP Writer via Clipboard
Summary
FreeRDP from 3.14.1 before 3.32.0 contains an integer underflow in the WinPR BMP writer, where a mismatched stride calculation passes SIZE_MAX - 3 to Stream_Zero for sub-byte images. A malicious RDP clipboard peer can return a crafted 1-bpp BMP processed by clipboard_synthesize_image_format_to_bmp for CF_DIB/CF_DIBV5, crashing the client or causing an out-of-bounds write.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-19 21:28 UTC
CWE
- CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/FreeRDP/FreeRDP/security/advis… | vendor-advisory |
| https://www.vulncheck.com/advisories/freerdp-3.14… | third-party-advisory |
Impacted products
Date Public
2026-10-02 00:00
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CVE-2026-111808 (GCVE-0-2026-111808)
Vulnerability from cvelistv5 – Published: 2026-10-21 19:11 – Updated: 2026-10-23 21:22
VLAI
EPSS
VEX
Title
Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend worker-pool exhaustion
Summary
Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a malformed padded HTTP/2 DATA frame.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.
Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 20:52 UTC
CWE
- CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/r95dq29ywcd1f4x30… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server |
Affected:
8.0.0 , ≤ 8.1.11
(semver)
Affected: 9.0.0 , ≤ 9.2.15 (semver) Affected: 10.0.0 , ≤ 10.1.4 (semver) Affected: 10.2.0 (semver) |
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CVE-2026-111735 (GCVE-0-2026-111735)
Vulnerability from cvelistv5 – Published: 2026-10-29 15:42 – Updated: 2026-10-29 15:42
VLAI
EPSS
VEX
Title
Integer underflow leads to out-of-bounds read in pf_cpm_c_data_ind()
Summary
P-Net before 1.0.3 contains an integer underflow in pf_cpm_c_data_ind(). When handling a received cyclic data frame while the consumer is in the FRUN or RUN state, the offset of the APDU status was computed as the frame length minus 4 using 16-bit arithmetic, without checking that the frame is long enough. A crafted short frame makes the offset wrap around, so the function reads outside the receive buffer. This can cause a crash (denial of service) or disclose memory content.
Severity
Assigner
References
1 reference
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CVE-2026-111075 (GCVE-0-2026-111075)
Vulnerability from cvelistv5 – Published: 2026-10-21 08:00 – Updated: 2026-10-26 17:57
VLAI
EPSS
VEX
Title
JITServer: Pre-authentication remote crash via integer underflow and out-of-bounds heap read in DataDescriptor deserialization
Summary
In Eclipse OpenJ9 versions prior to 0.63.0, the JITServer component fails to perform cross-field validation on attacker-controlled `_size`, `_paddingSize`, and `_dataOffset` fields during `DataDescriptor` message deserialization. An unauthenticated remote attacker can send a crafted network payload that triggers an unsigned integer underflow in `DataDescriptor::getPayloadSize()` and `DataDescriptor::getNextDescriptor()`. This results in an out-of-bounds heap read and an immediate process crash (SIGSEGV), causing a denial of service.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 17:36 UTC
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Foundation | Eclipse OpenJ9 |
Affected:
0.8.0 , < 0.63
(semver)
|
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CVE-2026-110714 (GCVE-0-2026-110714)
Vulnerability from cvelistv5 – Published: 2026-10-14 15:01 – Updated: 2026-10-20 01:29
VLAI
EPSS
VEX
Title
libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
Summary
libsmb2 through 6.2 contains an integer underflow vulnerability in decode_acl that allows malicious SMB servers to trigger heap out-of-bounds reads via crafted security descriptors. Attackers controlling a server or intercepting unsigned sessions can send an AclSize below 8 in a QUERY_INFO reply, bypassing ACE bounds checks and crashing the client.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-20 01:29 UTC
CWE
- CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://hackmd.io/@haind-pwn/libsmb2-query-info-r… | technical-descriptionexploit |
| https://github.com/sahlberg/libsmb2/blob/d67e213a… | technical-description |
| https://github.com/sahlberg/libsmb2/commit/523abe… | patch |
| https://github.com/sahlberg/libsmb2 | product |
| https://www.vulncheck.com/advisories/libsmb2-thro… | third-party-advisory |
Date Public
2026-07-10 00:00
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.