GHSA-h25m-26qc-wcjf
ADVISORY - githubSummary
A vulnerability affects certain React Server Components packages for versions 19.0.x, 19.1.x, and 19.2.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23864.
A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage, out-of-memory exceptions, or server crashes. This can result in denial of service in unpatched environments.
GitHub
CVSS SCORE
7.5high| Package | Type | OS Name | OS Version | Affected Ranges | Fix Versions |
|---|---|---|---|---|---|
| next | npm | - | - | >=13.0.0,<15.0.8 | 15.0.8 |
| next | npm | - | - | >=15.1.1-canary.0,<15.1.12 | 15.1.12 |
| next | npm | - | - | >=15.2.0-canary.0,<15.2.9 | 15.2.9 |
| next | npm | - | - | >=15.3.0-canary.0,<15.3.9 | 15.3.9 |
| next | npm | - | - | >=15.4.0-canary.0,<15.4.11 | 15.4.11 |
| next | npm | - | - | >=15.5.1-canary.0,<15.5.10 | 15.5.10 |
| next | npm | - | - | >=15.6.0-canary.0,<15.6.0-canary.61 | 15.6.0-canary.61 |
| next | npm | - | - | >=16.0.0-beta.0,<16.0.11 | 16.0.11 |
| next | npm | - | - | >=16.1.0-canary.0,<16.1.5 | 16.1.5 |
CVSS:3 Severity and metrics
The CVSS metrics represent different qualitative aspects of a vulnerability that impact the overall score, as defined by the CVSS Specification.
The vulnerable component is bound to the network stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared physical (e.g., Bluetooth or IEEE 802.11) or logical (e.g., local IP subnet) network, or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN to an administrative network zone). One example of an Adjacent attack would be an ARP (IPv4) or neighbor discovery (IPv6) flood leading to a denial of service on the local LAN segment (e.g., CVE-2013-6014).
Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component.
The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
The vulnerable system can be exploited without interaction from any user.
An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
There is no loss of confidentiality.
There is no loss of trust or accuracy within the impacted component.
There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component.
Chainguard
CGA-3522-gcqm-wf8x
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