RHSA-2026:62578
Vulnerability from csaf_redhat - Published: 2026-09-02 11:46 - Updated: 2026-09-04 21:15Summary
Red Hat Security Advisory: go-fdo-server security update
Severity
Important
Notes
Topic: An update for go-fdo-server is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: This package provides a server-side implementation of the FIDO Device Onboard (FDO) specification, written in Go. FDO is an open standard for the late binding of device credentials, allowing for automated and secure on-boarding of devices when they are first powered on in their final location.
Security Fix(es):
* crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)
* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)
* net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)
* net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)
* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the `crypto/x509` package within Go (golang). When verifying a certificate chain, excluded DNS (Domain Name System) constraints are not correctly applied to wildcard DNS Subject Alternative Names (SANs) if the case of the SAN differs from the constraint. This oversight could allow an attacker to bypass certificate validation, potentially leading to the acceptance of a malicious certificate that should have been rejected. This issue specifically impacts the validation of trusted certificate chains.
8.8 (High)
Affected products
Fixed
10 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-manufacturer-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-owner-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-rendezvous-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in the `encoding/asn1` package in Go. An attacker could provide a specially crafted, deeply-nested Abstract Syntax Notation One (ASN.1) structure, leading to excessive recursion during the `Unmarshal` operation. This could result in stack exhaustion and a Denial of Service (DoS) condition.
7.5 (High)
Affected products
Fixed
10 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-manufacturer-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-owner-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-rendezvous-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in the `net/http` component of the Go standard library. When a server is configured to support unencrypted HTTP/2, it reads initial bytes from new connections to detect the HTTP/2 client preface. However, the `ReadHeaderTimeout` is not correctly applied during this process. This oversight could allow a remote attacker to maintain open connections indefinitely, potentially leading to a Denial of Service (DoS) by exhausting server resources.
7.5 (High)
Affected products
Fixed
10 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-manufacturer-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-owner-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-rendezvous-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in `net/url`, a component of `golang`. This vulnerability arises when resolving relative paths that contain numerous parent directory ('..') segments. A remote attacker could exploit this by providing a specially crafted path, leading to quadratic time complexity and excessive memory allocation. This can result in a Denial of Service (DoS) due to resource exhaustion.
7.5 (High)
Affected products
Fixed
10 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-manufacturer-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-owner-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-rendezvous-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.
7.5 (High)
Affected products
Fixed
10 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debuginfo-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-debugsource-0:1.0.1-2.el10_2.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-manufacturer-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-owner-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:go-fdo-server-rendezvous-0:1.0.1-2.el10_2.4.noarch | — |
Vendor Fix
fix
|
Threats
Impact
Important
References
45 references
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{
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},
{
"category": "external",
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{
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"url": "https://go.dev/issue/80205"
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{
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},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-6089",
"url": "https://pkg.go.dev/vuln/GO-2026-6089"
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],
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"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"title": "net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service"
},
{
"cve": "CVE-2026-56860",
"cwe": {
"id": "CWE-770",
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"ids": [
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}
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service flaw in the Go `net/url` package. Applications built with Go that process untrusted URLs containing parent directory segments (\u0027..\u0027) may be vulnerable to excessive resource consumption due to quadratic time complexity in path resolution. This can lead to a denial of service, impacting the availability of affected services.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
"category": "external",
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},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56860"
},
{
"category": "external",
"summary": "https://go.dev/cl/803681",
"url": "https://go.dev/cl/803681"
},
{
"category": "external",
"summary": "https://go.dev/issue/80494",
"url": "https://go.dev/issue/80494"
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{
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}
],
"title": "net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution"
},
{
"cve": "CVE-2026-56862",
"cwe": {
"id": "CWE-1050",
"name": "Excessive Platform Resource Consumption within a Loop"
},
"discovery_date": "2026-08-13T22:16:41.928450+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2515839"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service vulnerability in the `golang` `crypto/tls` package. A remote, unauthenticated attacker can exploit this flaw by continuously sending `KeyUpdate` messages during a TLS handshake, forcing the server to perform indefinite key derivation operations. This resource exhaustion can lead to a denial of service for applications and services in Red Hat products that use the affected `crypto/tls` library and are exposed to untrusted network clients.",
"title": "Statement"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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}
],
"title": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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