CVE-2026-48509 Vulnerability Analysis & Exploit Details

CVE-2026-48509
Vulnerability Scoring

9.1

/10

Critical Risk

As a catastrophic security flaw, CVE-2026-48509 has severe implications, demanding immediate intervention.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: None
No privileges are required for exploitation.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2026-48509 Details

Status: Analyzed

Last updated: 🕓 25 Jun 2026, 16:16 UTC
Originally published on: 🕙 22 Jun 2026, 22:16 UTC

Time between publication and last update: 2 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVE-2026-48509 Vulnerability Summary

CVE-2026-48509: MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, the parameterless MessagePackInputFormatter() constructor uses default serializer options, which resolve to MessagePackSerializerOptions.Standard with MessagePackSecurity.TrustedData. The formatter is designed for ASP.NET Core MVC request bodies, which commonly cross an HTTP trust boundary. This insecure default can expose applications to denial-of-service attacks that MessagePackSecurity.UntrustedData is intended to mitigate, such as hash-collision attacks against dictionary-like model properties. This vulnerability is fixed in 2.5.301 and 3.1.7.

Assessing the Risk of CVE-2026-48509

Access Complexity Graph

The exploitability of CVE-2026-48509 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-48509

With low attack complexity and no required privileges, CVE-2026-48509 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-48509, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-48509, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: None
CVE-2026-48509 has no significant impact on data confidentiality.
Integrity: High
CVE-2026-48509 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: High
CVE-2026-48509 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-48509 References

External References

https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-2f33-pr97-265q

CWE Common Weakness Enumeration

CWE-1188

CAPEC Common Attack Pattern Enumeration and Classification

Exploitation of Thunderbolt Protection Flaws CAPEC-665 An adversary leverages a firmware weakness within the Thunderbolt protocol, on a computing device to manipulate Thunderbolt controller firmware in order to exploit vulnerabilities in the implementation of authorization and verification schemes within Thunderbolt protection mechanisms. Upon gaining physical access to a target device, the adversary conducts high-level firmware manipulation of the victim Thunderbolt controller SPI (Serial Peripheral Interface) flash, through the use of a SPI Programing device and an external Thunderbolt device, typically as the target device is booting up. If successful, this allows the adversary to modify memory, subvert authentication mechanisms, spoof identities and content, and extract data and memory from the target device. Currently 7 major vulnerabilities exist within Thunderbolt protocol with 9 attack vectors as noted in the Execution Flow.

Vulnerable Configurations

cpe:2.3:a:messagepack:messagepack:.1.7.3.5:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:.1.7.3.5:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:.1.7.3.6:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:.1.7.3.6:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.0.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.0.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.0.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.0.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.0.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.0.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.1.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.1.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.1.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.1.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.1.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.1.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.2.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.2.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.2.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.2.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.2.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.2.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.3.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.3.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.3.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.3.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.3.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.3.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.3.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.3.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.4:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.4.4:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.5.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.5.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.5.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.5.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.6.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.6.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.6.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.6.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.6.1.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.6.1.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.6.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.6.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.4:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.4:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.7:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.7.3.7:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.9.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:1.9.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.94:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.94:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.110:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.110:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.119:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.119:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.123:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.123:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.204:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.204:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.270:rc:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.270:rc:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.299:rc:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.299:rc:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.323:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.323:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.335:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.0.335:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.80:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.80:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.90:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.90:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.115:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.115:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.143:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.143:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.152:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.152:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.165:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.165:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.194:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.1.194:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.36:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.36:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.44:rc:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.44:rc:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.60:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.60:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.85:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.85:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.113:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.2.113:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.58:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.58:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.73:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.73:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.75:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.75:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.85:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.85:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.112:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.3.112:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.4.14:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.4.14:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.4.23:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.4.23:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.4.35:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.4.35:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.4.59:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.4.59:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.64:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.64:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.94:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.94:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.103:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.103:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.108:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.108:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.124:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.124:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.129:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.129:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.140:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.140:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.168:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.168:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.171:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.171:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.172:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.172:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.187:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.187:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.192:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.192:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.198:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.198:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.205:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:2.5.205:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.54:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.54:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.111:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.111:alpha:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.129:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.129:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.134:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.134:beta:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.208:rc1:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.208:rc1:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.214:rc1:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.214:rc1:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.233:rc1:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.233:rc1:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.238:rc1:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.238:rc1:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.300:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.300:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.301:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.0.301:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.0:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.1:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.2:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.3:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.4:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.4:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.5:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.5:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.6:*:*:*:*:c\#:*:*
cpe:2.3:a:messagepack:messagepack:3.1.6:*:*:*:*:c\#:*:*

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