Common Weakness Enumeration
CWE-252
AllowedUnchecked Return Value
Abstraction: Base · Status: Draft
The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions.
251 vulnerabilities reference this CWE, most recent first.
CVE-2026-90648 (GCVE-0-2026-90648)
Vulnerability from cvelistv5 – Published: 2026-09-12 23:16 – Updated: 2026-09-12 23:16
VLAI
EPSS
VEX
Summary
wasm2c in WebAssembly wabt through 1.0.41 allows sandbox escape in some situations that primarily involve 32-bit platforms, aka a "table flip" attack. It does not check the return value of calloc() in wasm_rt_allocate_funcref_table() (wasm2c/wasm-rt-impl-tableops.inc). When the funcref table allocation fails, table->data is left NULL while table->size keeps the guest-declared element count; thus, bounds checks still pass and table element accesses resolve to absolute memory addresses (i * sizeof(wasm_rt_funcref_t)). This gives arbitrary read and write of host process memory and - via table.get, table.set, and call_indirect - arbitrary code execution, defeating the isolation that wasm2c exists to provide (a full sandbox escape). wasm2c is used as an in-process sandboxing boundary by RLBox and WasmBoxC, including in Firefox, which compiles the Graphite, Hunspell, Ogg, Expat, and Woff2 libraries via wasm2c to contain untrusted font, media, and XML input. Therefore, sandboxing in these applications is potentially affected. Exploitation requires the funcref table allocation to fail, for example under an address-space limit (RLIMIT_AS), on 32-bit hosts, with vm.overcommit_memory=2, or under memory pressure. On 64-bit Linux with default overcommit the allocation succeeds and the defect is not triggered. The wasm2c memory allocator aborts on calloc failure in the same runtime; the table allocator lacks this abort behavior. This was introduced in commit ab9e0b55 (PR #813).
Severity
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/trustsig-eu/wasm2c-tableflip | exploittechnical-description |
| https://github.com/WebAssembly/wabt | product |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1827704 | related |
| https://https://blog.mozilla.org/attack-and-defen… | related |
| https://rlbox.dev | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| WebAssembly | wabt |
Affected:
0 , ≤ 1.0.41
(semver)
cpe:2.3:a:webassembly:wabt:*:*:*:*:*:*:*:* |
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CVE-2026-86749 (GCVE-0-2026-86749)
Vulnerability from cvelistv5 – Published: 2026-09-09 13:32 – Updated: 2026-09-09 13:32
VLAI
EPSS
VEX
Title
snipe-it before 8.7.0 Data Loss via Failed Image Write
Summary
Snipe-IT versions <= 8.6.3 (fixed in 8.7.0) do not check the return value of storage write operations in ImageUploadRequest::handleImages(). Because Laravel's default disk mode does not throw on failure, a silently failed Storage::disk('public')->put(...) call still caused the application to delete the previous image via deleteExistingImage() and to reassign and persist the model's image reference to the new filename, destroying the existing image and leaving the database row pointing at a file that was never written. A mirror problem existed in deleteExistingImage(), where a failed Storage::delete() still nulled the model's image field, orphaning the file on disk. The condition is not directly attacker-controlled: it is triggered when any legitimate authenticated user submits an image upload while the storage backend transiently fails (for example an S3 network error, a local filesystem permission problem, or quota exhaustion). The result is unrecoverable loss of the prior image and a durable inconsistency between the database and disk that requires manual reconciliation. All models whose controllers route through ImageUploadRequest::handleImages (assets, asset models, users, companies, manufacturers, locations, categories, suppliers, departments, and other image-carrying models) are affected.
Severity
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/grokability/snipe-it/security/… | vendor-advisory |
| https://www.vulncheck.com/advisories/snipe-it-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| grokability | snipe-it |
Affected:
0 , < 8.7.0
(semver)
Unaffected: 8.7.0 (semver) cpe:2.3:a:snipeitapp:snipe-it:*:*:*:*:*:*:*:* |
Date Public
2026-08-24 00:00
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CVE-2026-86739 (GCVE-0-2026-86739)
Vulnerability from cvelistv5 – Published: 2026-09-09 13:32 – Updated: 2026-09-09 13:32
VLAI
EPSS
VEX
Title
Snipe-IT before 8.7.0 Acceptance Finalization Without Stored Evidence
Summary
Snipe-IT 8.6.3 and earlier do not check the return value of Storage::put() when writing the signature PNG and the generated acceptance PDF in Account\AcceptanceController::store(). On filesystem drivers that return false instead of throwing on a write failure (for example the local disk with restrictive permissions, S3 with expired credentials, or a storage backend that is out of quota), execution continues into $acceptance->accept(), which sets accepted_at and the signature_filename/eula_filename fields, creates the 'accepted' action-log entry, and dispatches completion notifications even though the evidence files were never stored. The result is an acceptance record marked complete whose supporting evidence files do not exist, yielding a materially incomplete compliance artifact for EULA acknowledgement or equipment-receipt workflows. The condition is triggered when an authenticated user completes an acceptance while the storage backend is silently failing writes; an attacker cannot directly force the storage backend into that state. Fixed in Snipe-IT 8.7.0.
Severity
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/grokability/snipe-it/security/… | vendor-advisory |
| https://www.vulncheck.com/advisories/snipe-it-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| grokability | snipe-it |
Affected:
0 , < 8.7.0
(semver)
Unaffected: 8.7.0 (semver) cpe:2.3:a:snipeitapp:snipe-it:*:*:*:*:*:*:*:* |
Date Public
2026-08-24 00:00
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CVE-2026-86141 (GCVE-0-2026-86141)
Vulnerability from cvelistv5 – Published: 2026-09-05 04:27 – Updated: 2026-09-09 19:15
VLAI
EPSS
VEX
Summary
xmlregexp in libxml2 before 2.15.4 has a NULL pointer dereference in xmlRegNewParserCtxt after a strdup failure, i.e., it does not calculate a string length after NULL checking.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 19:15 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
Impacted products
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CVE-2026-85649 (GCVE-0-2026-85649)
Vulnerability from cvelistv5 – Published: 2026-09-04 12:59 – Updated: 2026-09-04 17:59
VLAI
EPSS
VEX
Summary
(Holloway) Chew, Kean Ho's Actualizer v1.2.0 and earlier contains a fail-open password validation vulnerability in the Alpha user and root user password loops of Shell/debian-minbase-install.sh. The installer invokes mkpasswd to generate yescrypt password hashes but does not check the command's return value and unconditionally accepts the result. If mkpasswd fails to generate a yescrypt hash, for example because an incompatible mkpasswd implementation or an environment without yescrypt support is used, the resulting password hash variable can be empty and the build proceeds. The resulting image can therefore contain empty password fields for the root and alpha accounts, potentially permitting passwordless authentication depending on the authentication configuration.
Severity
7.9 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 17:59 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ChewKeanHo/software-actualizer… | release-notespatch |
| https://github.com/ChewKeanHo/software-actualizer… | patch |
| https://github.com/ChewKeanHo/software-actualizer… | |
| https://doi.org/10.5281/zenodo.22169659 | technical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| chewkeanho | software-actualizer |
Affected:
0 , ≤ 1.2.0
(semver)
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CVE-2026-79772 (GCVE-0-2026-79772)
Vulnerability from cvelistv5 – Published: 2026-08-25 15:16 – Updated: 2026-08-28 22:24
VLAI
EPSS
VEX
Title
Nokogiri before 1.19.1 Unchecked Return Value canonicalize
Summary
Nokogiri versions before 1.19.1 fail to check the return value from xmlC14NExecute in the canonicalize method, returning an empty string on failure instead of raising an exception. Attackers can exploit this to bypass signature validation in downstream SAML libraries by providing invalid canonicalized XML that is incorrectly accepted as valid.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 22:24 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sparklemotion/nokogiri/securit… | vendor-advisory |
| https://www.vulncheck.com/advisories/nokogiri-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sparklemotion | nokogiri |
Affected:
1.5.1 , < 1.19.1
(semver)
Unaffected: 1.19.1 (semver) cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:*:*:* |
Date Public
2026-02-16 00:00
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CVE-2026-78699 (GCVE-0-2026-78699)
Vulnerability from cvelistv5 – Published: 2026-08-30 15:13 – Updated: 2026-09-01 12:30
VLAI
EPSS
VEX
Title
rename_tenant returns :ok on a failed rename, enabling cross-tenant access in AshPostgres
Summary
Unchecked Return Value vulnerability in ash-project ash_postgres allows a user who can drive a tenant rename to a name that collides with an existing tenant's schema to have their tenant record repointed at that other tenant's live schema, gaining access to its data.
AshPostgres.MultiTenancy.rename_tenant/3 issues the ALTER SCHEMA ... RENAME TO ... with the non-raising Ecto.Adapters.SQL.query/2, discards its {:ok, _} | {:error, _} result, and unconditionally returns :ok. PostgreSQL rejects the rename when the target schema already exists (and on insufficient privilege or lock timeout), but that failure never reaches the caller. The calling manage_tenant update action therefore sees success and commits the tenant row with the new name, which is the schema of a different existing tenant, so subsequent reads and writes for that tenant run against the other tenant's data.
This issue affects ash_postgres: from 0.25.0 before 2.13.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 12:30 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash_postgres/secur… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-78699.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-78699 | related |
| https://github.com/ash-project/ash_postgres/commi… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| ash-project | ash_postgres |
Affected:
0.25.0 , < 2.13.0
(semver)
cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:* |
|
| ash-project | ash_postgres |
Affected:
03510dae24020e302558ef947be7ea874a9ce756 , < 8544ab15fe45784553c2d2da8ee1a388eee0174b
(git)
cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:* |
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CVE-2026-77641 (GCVE-0-2026-77641)
Vulnerability from cvelistv5 – Published: 2026-08-20 21:09 – Updated: 2026-08-27 16:06
VLAI
EPSS
VEX
Summary
tor before 0.4.9.9 was prone to a NULL write after free when sending a CONFLUX_SWITCH cell fails. The return value of relay_send_command_from_edge() was ignored, so a send failure (which calls circuit_mark_for_close() and removes the leg via cfx_del_leg()) would go undetected, causing the caller to write to the now-freed current leg and resulting in a crash. This is TROVE-2026-017.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 15:47 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| torproject | Tor |
Affected:
0.4.8.1-alpha , < 0.4.9.9
(custom)
cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:* |
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CVE-2026-62909 (GCVE-0-2026-62909)
Vulnerability from cvelistv5 – Published: 2026-08-11 17:04 – Updated: 2026-09-11 16:47
VLAI
EPSS
VEX
Title
.NET Elevation of Privilege Vulnerability
Summary
Uncaught exception in .NET allows an authorized attacker to elevate privileges locally.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 03:55 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | .NET 10.0 |
Affected:
10.0.0 , < 10.0.11
(custom)
|
|
| Microsoft | .NET 8.0 |
Affected:
8.0.0 , < 8.0.30
(custom)
|
|
| Microsoft | .NET 9.0 |
Affected:
9.0.0 , < 9.0.19
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2022 version 17.14 |
Affected:
17.14.0 , < 17.14.38
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2026 version 18.8 |
Affected:
18.0 , < 18.8.3
(custom)
|
Date Public
2026-08-11 14:00
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CVE-2026-61857 (GCVE-0-2026-61857)
Vulnerability from cvelistv5 – Published: 2026-07-11 13:01 – Updated: 2026-07-13 17:09
VLAI
EPSS
VEX
Title
ImageMagick before 7.1.2-26 Heap Use-After-Free via XMP
Summary
ImageMagick before 7.1.2-26 contains a heap use-after-free vulnerability caused by missing null check when parsing XMP profiles. Attackers can craft malicious image files with specially crafted XMP data to trigger the vulnerability and cause application crashes.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 17:06 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ImageMagick/ImageMagick/securi… | vendor-advisory |
| https://www.vulncheck.com/advisories/imagemagick-… | third-party-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| ImageMagick | ImageMagick |
Affected:
0 , < 7.1.2-26
(semver)
Unaffected: 7.1.2-26 (semver) |
|
| ImageMagick | ImageMagick |
Affected:
0 , < 6.9.13-51
(semver)
Unaffected: 6.9.13-51 (semver) |
Date Public
2026-06-26 00:00
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Mitigation MIT-53
Implementation
Check the results of all functions that return a value and verify that the value is expected.
Mitigation MIT-56
Implementation
For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
Mitigation
Implementation
Ensure that you account for all possible return values from the function.
Mitigation
Implementation
When designing a function, make sure you return a value or throw an exception in case of an error.
No CAPEC attack patterns related to this CWE.