Common Weakness Enumeration
CWE-789
Weakness AllowedMemory Allocation with Excessive Size Value
Abstraction: Variant · Status: Draft
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.
Mapping guidance
This CWE entry is at the Variant 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
Fuzzing
Fuzz testing (fuzzing) is a powerful technique for generating large numbers of diverse inputs - either randomly or algorithmically - and dynamically invoking the code with those inputs. Even with random inputs, it is often capable of generating unexpected results such as crashes, memory corruption, or resource consumption. Fuzzing effectively produces repeatable test cases that clearly indicate bugs, which helps developers to diagnose the issues.
Effectiveness: High
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
Automated Dynamic Analysis
Use tools that are integrated during compilation to insert runtime error-checking mechanisms related to memory safety errors, such as AddressSanitizer (ASan) for C/C++ [REF-1518].
Effectiveness: Moderate
Crafted inputs are necessary to reach the code containing the error, such as generated by fuzzers. Also, these tools may reduce performance, and they only report the error condition - not the original mistake that led to the error.
Notes
Relationship
This weakness can be closely associated with integer overflows (CWE-190). Integer overflow attacks would concentrate on providing an extremely large number that triggers an overflow that causes less memory to be allocated than expected. By providing a large value that does not trigger an integer overflow, the attacker could still cause excessive amounts of memory to be allocated.
Applicable Platform
Uncontrolled memory allocation is possible in many languages, such as dynamic array allocation in perl or initial size parameters in Collections in Java. However, languages like C and C++ where programmers have the power to more directly control memory management will be more susceptible.
Content history
Submission: CWE Content Team
· MITRE
· 2009-10-21
· CWE 1.6
Modification: CWE Content Team
· MITRE
· 2010-02-16
· CWE 1.8
updated Taxonomy_Mappings
Modification: CWE Content Team
· MITRE
· 2011-03-29
· CWE 1.12
updated Common_Consequences, Observed_Examples
Modification: CWE Content Team
· MITRE
· 2011-06-01
· CWE 1.13
updated Common_Consequences
Modification: CWE Content Team
· MITRE
· 2012-05-11
· CWE 2.2
updated References
Modification: CWE Content Team
· MITRE
· 2017-11-08
· CWE 3.0
updated Applicable_Platforms, Taxonomy_Mappings
Modification: CWE Content Team
· MITRE
· 2019-01-03
· CWE 3.2
updated References, Relationships, Taxonomy_Mappings
Modification: CWE Content Team
· MITRE
· 2019-06-20
· CWE 3.3
updated Relationships
Modification: CWE Content Team
· MITRE
· 2020-02-24
· CWE 4.0
updated Relationships
Modification: CWE Content Team
· MITRE
· 2020-06-25
· CWE 4.1
updated Relationships
Modification: CWE Content Team
· MITRE
· 2020-08-20
· CWE 4.2
updated Relationships
Modification: CWE Content Team
· MITRE
· 2020-12-10
· CWE 4.3
updated Alternate_Terms, Demonstrative_Examples, Description, Likelihood_of_Exploit, Name, Observed_Examples, Relationships, Time_of_Introduction
Modification: CWE Content Team
· MITRE
· 2021-03-15
· CWE 4.4
updated Demonstrative_Examples, Relationships
Modification: CWE Content Team
· MITRE
· 2022-10-13
· CWE 4.9
updated Observed_Examples
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, Relationships
Modification: CWE Content Team
· MITRE
· 2025-09-09
· CWE 4.18
updated Affected_Resources, Functional_Areas, Observed_Examples
Modification: CWE Content Team
· MITRE
· 2025-12-11
· CWE 4.19
updated Detection_Factors, References
Modification: CWE Content Team
· MITRE
· 2026-04-30
· CWE 4.20
updated Observed_Examples
Modification: CWE Content Team
· MITRE
· 2026-10-28
· CWE 5.0
updated References
612 vulnerabilities reference this CWE, most recent first.
CVE-2026-126165 (GCVE-0-2026-126165)
Vulnerability from cvelistv5 – Published: 2026-11-11 21:29 – Updated: 2026-11-11 21:29
VLAI
EPSS
VEX
Summary
A memory allocation with excessive size value vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2 all versions may allow a remote unauthenticated attacker to cause a denial of service via a specially crafted attachment delivered over SMTP.
Severity
CWE
- CWE-789 - Denial of service
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Fortinet | FortiMail |
Affected:
8.0.0 , ≤ 8.0.1
(semver)
Affected: 7.6.0 , ≤ 7.6.6 (semver) Affected: 7.4.0 , ≤ 7.4.8 (semver) Affected: 7.2.0 , ≤ 7.2.9 (semver) Affected: 7.0.0 , ≤ 7.0.9 (semver) cpe:2.3:a:fortinet:fortimail:8.0.1:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:8.0.0:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.6.6:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.6.5:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.6.4:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.6.3:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.6.2:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.6.1:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.6.0:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.4.8:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.4.7:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.4.6:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.4.5:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.4.4:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.4.3:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.4.2:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.4.1:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.4.0:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.9:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.8:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.7:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.6:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.5:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.4:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.3:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.2:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.1:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.2.0:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.9:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.8:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.7:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.6:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.5:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.4:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.3:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.2:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.1:*:*:*:*:*:*:* cpe:2.3:a:fortinet:fortimail:7.0.0:*:*:*:*:*:*:* |
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CVE-2026-125263 (GCVE-0-2026-125263)
Vulnerability from cvelistv5 – Published: 2026-11-09 19:12 – Updated: 2026-11-09 20:56
VLAI
EPSS
VEX
Title
FFmpeg 9.0 through 9.0.2 Memory Exhaustion via LCEVC Enhancement Dimensions
Summary
FFmpeg 9.0 through 9.0.2 built with liblcevc_dec fails to validate LCEVC enhanced output dimensions against max_pixels in libavcodec/decode.c before frame allocation. Attackers can supply crafted H.264, HEVC or VVC streams declaring huge LCEVC resolutions to force oversized get_buffer2() allocations and exhaust memory.
Severity
4.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 20:54 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25408 | issue-tracking |
| https://github.com/FFmpeg/FFmpeg/commit/60b286521… | patch |
| https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/liba… | technical-description |
| https://github.com/FFmpeg/FFmpeg | product |
| https://www.vulncheck.com/advisories/ffmpeg-9.0-t… | third-party-advisory |
Impacted products
Date Public
2026-10-24 00:00
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CVE-2026-125226 (GCVE-0-2026-125226)
Vulnerability from cvelistv5 – Published: 2026-11-09 19:11 – Updated: 2026-11-09 21:06
VLAI
EPSS
VEX
Title
FFmpeg through 9.0.2 Excessive Memory Allocation via SBaGen Demuxer
Summary
FFmpeg through 9.0.2 contains an uncontrolled memory allocation vulnerability in sbg_read_header() in libavformat/sbgdec.c that derives an unbounded default frame size from the script's sample rate. Attackers can supply a crafted SBaGen script declaring a very high -r sample rate so the wavesynth decoder allocates enormous audio frames, exhausting memory and causing denial of service.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 20:58 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25703 | issue-tracking |
| https://github.com/FFmpeg/FFmpeg/commit/1f4b2e22c… | patch |
| https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/liba… | technical-description |
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CVE-2026-125207 (GCVE-0-2026-125207)
Vulnerability from cvelistv5 – Published: 2026-11-09 19:11 – Updated: 2026-11-09 21:06
VLAI
EPSS
VEX
Title
FFmpeg through 9.0.2 Excessive Memory Allocation via Interplay ACM Decoder
Summary
FFmpeg through 9.0.2 contains an uncontrolled memory allocation vulnerability in the Interplay ACM decoder that allows attackers to exhaust memory via an attacker-controlled block size. Attackers can supply a crafted ACM file with maximum level and row count in extradata, making decode_init() allocate nearly a gigabyte and deny service.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 21:00 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25703 | issue-tracking |
| https://github.com/FFmpeg/FFmpeg/commit/6ecaddb9c… | patch |
| https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/liba… | technical-description |
| https://github.com/FFmpeg/FFmpeg | product |
| https://www.vulncheck.com/advisories/ffmpeg-throu… | third-party-advisory |
Impacted products
Date Public
2026-11-03 00:00
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CVE-2026-125104 (GCVE-0-2026-125104)
Vulnerability from cvelistv5 – Published: 2026-11-09 19:10 – Updated: 2026-11-09 21:06
VLAI
EPSS
VEX
Title
FFmpeg through 9.0.2 Memory Exhaustion DoS via APE Decoder apedec.c
Summary
FFmpeg through 9.0.2 contains a memory exhaustion vulnerability in ape_decode_frame() in libavcodec/apedec.c that fails to enforce the 73728-sample limit for legacy APE frames. Attackers can supply a crafted legacy Monkey's Audio file declaring an enormous nblocks value to force gigabyte-scale allocations and cause denial of service.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 21:04 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25703 | issue-tracking |
| https://github.com/FFmpeg/FFmpeg/commit/968e9e948… | patch |
| https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/liba… | technical-description |
| https://github.com/FFmpeg/FFmpeg | product |
| https://www.vulncheck.com/advisories/ffmpeg-throu… | third-party-advisory |
Impacted products
Date Public
2026-11-03 00:00
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CVE-2026-123616 (GCVE-0-2026-123616)
Vulnerability from cvelistv5 – Published: 2026-11-08 01:38 – Updated: 2026-11-12 17:52
VLAI
EPSS
VEX
Title
imgproxy 3.3.0 before 4.0.16 Memory Exhaustion DoS via ICO Loader
Summary
imgproxy from 3.3.0 before 4.0.16 contains an unbounded memory allocation vulnerability in the ICO loader that fails to validate the data_size field. Attackers can supply a crafted 23-byte ICO file declaring a ~4GB data_size to trigger memory exhaustion and worker crashes without authentication.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-12 17:51 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/imgproxy/imgproxy/security/adv… | vendor-advisory |
| https://www.vulncheck.com/advisories/imgproxy-3.3… | third-party-advisory |
Impacted products
Date Public
2026-10-06 00:00
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CVE-2026-123563 (GCVE-0-2026-123563)
Vulnerability from cvelistv5 – Published: 2026-11-08 01:38 – Updated: 2026-11-13 03:03
VLAI
EPSS
VEX
Title
Devalue before 5.9.3 Typed-Array Allocation Validation Bypass via parse
Summary
Devalue before 5.9.3 contains a validation bypass vulnerability that allows custom ArrayBuffer revivers to skip typed-array allocation checks in the parse function. Attackers can supply very small crafted input processed by a malformed ArrayBuffer reviver to allocate massive ArrayBuffers, causing memory exhaustion and denial of service.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-13 03:03 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/devalue/security/advi… | vendor-advisory |
| https://www.vulncheck.com/advisories/devalue-befo… | third-party-advisory |
Impacted products
Date Public
2026-09-18 00:00
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CVE-2026-122146 (GCVE-0-2026-122146)
Vulnerability from cvelistv5 – Published: 2026-11-05 00:45 – Updated: 2026-11-10 18:07
VLAI
EPSS
VEX
Title
101arrowz fflate index.mjs unzipSync memory allocation
Summary
A weakness has been identified in 101arrowz fflate up to 0.8.3. This issue affects the function unzipSync of the file esm/index.mjs. This manipulation causes uncontrolled memory allocation. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. It is suggested to update the configuration settings. The maintainer disputes this issue as a vulnerability. The library is a pure JavaScript decompressor that allocates memory proportional to the decompressed payload size, which is expected behavior. Excessive allocations simply throw a standard JavaScript RangeError or reach engine heap limits. Furthermore, because a low-level decompression library cannot distinguish between a maliciously crafted compression bomb and a legitimate file with a high compression ratio, the API explicitly provides a filter option allowing callers to restrict decompressed file sizes and prevent denial-of-service according to their application's requirements, as seen both in the documentation and noted in the reported issue.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 20:31 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/431150 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/431150/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-122146 | third-party-advisory |
| https://vuldb.com/submit/1027352 | third-party-advisory |
| https://github.com/ictrun/java/issues/9 | exploitissue-tracking |
| https://github.com/101arrowz/fflate/blob/master/R… | related |
| https://github.com/101arrowz/fflate/ | product |
Impacted products
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CVE-2026-122129 (GCVE-0-2026-122129)
Vulnerability from cvelistv5 – Published: 2026-11-04 20:36 – Updated: 2026-11-05 20:48
VLAI
EPSS
VEX
Title
CESNET ipfixcol2 2.7.1 before 2.9.0 Memory Exhaustion via TCP LZ4 Decoder
Summary
CESNET ipfixcol2 2.7.1 before 2.9.0 contains a memory allocation vulnerability in Lz4Decoder::read_start_header() that allows unauthenticated attackers to exhaust memory by declaring unbounded ring buffer sizes. Attackers can open TCP connections sending LZ4 start headers with very large buffer sizes, forcing up to 4 GiB allocations per connection and denying collector service.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 20:48 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/CESNET/ipfixcol2/commit/1a1990… | patch |
| https://github.com/CESNET/ipfixcol2 | product |
| https://github.com/CESNET/ipfixcol2/releases/tag/v2.9.0 | release-notes |
| https://github.com/CESNET/ipfixcol2/blob/v2.8.0/s… | technical-description |
| https://www.vulncheck.com/advisories/cesnet-ipfix… | third-party-advisory |
Impacted products
Date Public
2026-10-14 00:00
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CVE-2026-122096 (GCVE-0-2026-122096)
Vulnerability from cvelistv5 – Published: 2026-11-11 12:13 – Updated: 2026-11-13 10:37
VLAI
EPSS
VEX
Title
Apache DataSketches Java: Uncontrolled resource consumption when deserializing crafted sketch images
Summary
Uncontrolled Resource Consumption vulnerability in the sketch deserialization of Apache DataSketches Java.
Several deserializers trusted sizes and counts declared in the serialized input. A small crafted input could make an application allocate an excessive amount of memory, leading to an OutOfMemoryError. A crafted string passed to FrequentLongsSketch.getInstance(String) could also make deserialization, or a later update, loop indefinitely. Only applications that deserialize sketches from untrusted sources are affected.
This issue affects Apache DataSketches Java: through 9.0.0.
Users are recommended to upgrade to version 9.1.0, which fixes the issue.
Severity
No CVSS data available.
CWE
Assigner
References
5 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache DataSketches Java |
Affected:
0 , ≤ 9.0.0
(semver)
|
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Mitigation
Implementation
Architecture and Design
Perform adequate input validation against any value that influences the amount of memory that is allocated. Define an appropriate strategy for handling requests that exceed the limit, and consider supporting a configuration option so that the administrator can extend the amount of memory to be used if necessary.
Mitigation
Operation
Run your program using system-provided resource limits for memory. This might still cause the program to crash or exit, but the impact to the rest of the system will be minimized.
No CAPEC attack patterns related to this CWE.