Laravel LLC up to 12.70.x/13.39.x Concurrency Concurrency::run input validation

Summaryinfo

A vulnerability identified as critical has been detected in Laravel LLC Laravel up to 12.70.x/13.39.x. The impacted element is the function Concurrency::run of the component Concurrency. This manipulation causes input validation. This vulnerability is tracked as CVE-2026-128083. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Laravel LLC Laravel up to 12.70.x/13.39.x. Affected by this vulnerability is the function Concurrency::run of the component Concurrency. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Laravel is a web application framework. Prior to 12.71.0 and 13.40.0, Laravel's Concurrency::run process driver can treat a forged internal result message in child standard output as framework output. An application route must invoke Concurrency::run, and a task must write attacker-controlled bytes at the start of the child's standard output that form a complete JSON document followed by gzip magic bytes. Under those application-specific conditions, an attacker can forge the internal result message and achieve remote code execution. The affected behavior is not exposed by default and requires application code that routes untrusted input into task output. This issue is fixed in versions 12.71.0 and 13.40.0.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-128083 since 11/12/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available.

Upgrading to version 12.71.0 or 13.40.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Laravel LLC

Name

• Laravel

Version

• 12.0
• 12.1
• 12.2
• 12.3
• 12.4
• 12.5
• 12.6
• 12.7
• 12.8
• 12.9
• 12.10
• 12.11
• 12.12
• 12.13
• 12.14
• 12.15
• 12.16
• 12.17
• 12.18
• 12.19
• 12.20
• 12.21
• 12.22
• 12.23
• 12.24
• 12.25
• 12.26
• 12.27
• 12.28
• 12.29
• 12.30
• 12.31
• 12.32
• 12.33
• 12.34
• 12.35
• 12.36
• 12.37
• 12.38
• 12.39
• 12.40
• 12.41
• 12.42
• 12.43
• 12.44
• 12.45
• 12.46
• 12.47
• 12.48
• 12.49
• 12.50
• 12.51
• 12.52
• 12.53
• 12.54
• 12.55
• 12.56
• 12.57
• 12.58
• 12.59
• 12.60
• 12.61
• 12.62
• 12.63
• 12.64
• 12.65
• 12.66
• 12.67
• 12.68
• 12.69
• 12.70
• 13.0
• 13.1
• 13.2
• 13.3
• 13.4
• 13.5
• 13.6
• 13.7
• 13.8
• 13.9
• 13.10
• 13.11
• 13.12
• 13.13
• 13.14
• 13.15
• 13.16
• 13.17
• 13.18
• 13.19
• 13.20
• 13.21
• 13.22
• 13.23
• 13.24
• 13.25
• 13.26
• 13.27
• 13.28
• 13.29
• 13.30
• 13.31
• 13.32
• 13.33
• 13.34
• 13.35
• 13.36
• 13.37
• 13.38
• 13.39

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion