Go http HTTP 2 amplification

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.1$0-$5k0.38

Summaryinfo

A vulnerability identified as problematic has been detected in Go http. The impacted element is an unknown function of the component HTTP 2. The manipulation leads to amplification. This vulnerability is uniquely identified as CVE-2026-78669. The attack is possible to be carried out remotely. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in Go http (affected version not known) and classified as problematic. This issue affects some unknown functionality of the component HTTP 2. The manipulation with an unknown input leads to a amplification vulnerability. Using CWE to declare the problem leads to CWE-405. The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric." Impacted is availability. The summary by CVE is:

A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.

The identification of this vulnerability is CVE-2026-78669 since 08/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 370347 (Rocky Linux 9 [CIQ] Security Update: go-toolset / golang / golang-bin / golang-docs / golang-misc / etc Multiple Vulnerabilities (crlsa-2026_86196)), which helps to determine the existence of the flaw in a target environment.

Applying the patch 847186 is able to eliminate this problem.

The vulnerability is also documented in the databases at Tenable (370347), EUVD (EUVD-2026-95426) and CERT Bund (WID-SEC-2026-3841). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Golang Go

Productinfo

Vendor

Name

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

Exploitinginfo

Class: Amplification
CWE: CWE-405 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 370347
Nessus Name: Rocky Linux 9 [CIQ] Security Update: go-toolset / golang / golang-bin / golang-docs / golang-misc / etc Multiple Vulnerabilities (crlsa-2026_86196)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 847186

Timelineinfo

08/25/2026 CVE reserved
10/08/2026 +44 days VulDB entry created
10/09/2026 +0 days Advisory disclosed
10/22/2026 +13 days VulDB entry last update

Sourcesinfo

Status: Confirmed

CNA: Go
CVE: CVE-2026-78669 (🔒)

GCVE (CVE): GCVE-0-2026-78669
GCVE (VulDB): GCVE-100-415697
EUVD: 🔒
CERT Bund: WID-SEC-2026-3841 - Golang Go: Mehrere Schwachstellen

Entryinfo

Created: 10/09/2026 01:07
Updated: 10/22/2026 14:48
Changes: 10/09/2026 01:07 (52), 10/09/2026 02:28 (1), 10/10/2026 07:16 (7), 10/22/2026 14:48 (2)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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