Google net/http up to 1.26.10/1.27.3 Synchronization MaxBytesReader missing synchronization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1$0-$5k0.30+

Summaryinfo

A vulnerability classified as problematic was found in Google net and http up to 1.26.10/1.27.3. The impacted element is the function MaxBytesReader of the component Synchronization. Such manipulation leads to missing synchronization. This vulnerability is documented as CVE-2026-97054. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Google net and http up to 1.26.10/1.27.3 and classified as problematic. Affected by this issue is the function MaxBytesReader of the component Synchronization. The manipulation with an unknown input leads to a missing synchronization vulnerability. Using CWE to declare the problem leads to CWE-820. The product utilizes a shared resource in a concurrent manner but does not attempt to synchronize access to the resource. Impacted is availability. CVE summarizes:

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

This vulnerability is handled as CVE-2026-97054 since 09/24/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/11/2026).

Upgrading to version 1.26.11 or 1.27.4 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Missing synchronization
CWE: CWE-820 / CWE-821
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: net/http 1.26.11/1.27.4

Timelineinfo

09/24/2026 CVE reserved
11/11/2026 +48 days Advisory disclosed
11/11/2026 +0 days VulDB entry created
11/11/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: google.com

Status: Confirmed

CNA: Go
CVE: CVE-2026-97054 (🔒)

GCVE (CVE): GCVE-0-2026-97054
GCVE (VulDB): GCVE-100-435596

Entryinfo

Created: 11/11/2026 04:36
Changes: 11/11/2026 04:36 (54)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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