RHSA-2026:34357
Vulnerability from csaf_redhat - Published: 2026-07-01 18:46 - Updated: 2026-07-02 00:10Summary
Red Hat Security Advisory: opentelemetry-collector security update
Severity
Important
Notes
Topic: An update for opentelemetry-collector 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: Collector with the supported components for a Red Hat build of OpenTelemetry
Security Fix(es):
* github.com/prometheus/prometheus: Prometheus: Denial of Service via uncontrolled memory allocation in remote read endpoint (CVE-2026-42154)
* github.com/prometheus/prometheus: Prometheus: Information disclosure of Azure OAuth client secret via config API (CVE-2026-42151)
* net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)
* golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)
* golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting (CVE-2026-25681)
* crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries (CVE-2026-27145)
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 golang.org/x/net/html. A remote attacker could exploit this vulnerability by providing specially crafted HTML. When this arbitrary HTML is parsed and rendered, it can result in an unexpected HTML tree, bypassing input sanitization. This can be leveraged to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution in applications that use the affected component.
8.1 (High)
Affected products
Fixed
5 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.
7.5 (High)
Affected products
Fixed
5 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in the `net` package of Go (golang), specifically when using the `LookupCNAME` function with the `cgo` DNS resolver. A remote attacker could exploit this by providing a very long Canonical Name (CNAME) response. This can trigger a double-free of C memory, leading to a crash and a Denial of Service (DoS) for the affected application.
7.5 (High)
Affected products
Fixed
5 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.
8.2 (High)
Affected products
Fixed
5 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in Prometheus, an open-source monitoring system. The `client_secret` field within the Azure Active Directory (AD) remote write OAuth configuration was incorrectly handled as a plain string instead of a secure Secret type. This misconfiguration allowed any user or process with access to the `/-/config` HTTP API endpoint to view the Azure OAuth client secret in plaintext. This vulnerability leads to information disclosure, potentially compromising the security of integrated Azure AD services.
7.5 (High)
Affected products
Fixed
5 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in Prometheus. An unauthenticated attacker can exploit the remote read endpoint (`/api/v1/read`) by sending a specially crafted, small snappy-compressed payload. This payload causes a disproportionately large memory allocation, leading to memory exhaustion and a Denial of Service (DoS) by crashing the Prometheus process.
7.5 (High)
Affected products
Fixed
5 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:opentelemetry-collector-0:0.152.1-1.el10_2.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
References
56 references
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"vulnerabilities": [
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"cwe": {
"id": "CWE-79",
"name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
},
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"ids": [
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{
"category": "description",
"text": "A flaw was found in golang.org/x/net/html. A remote attacker could exploit this vulnerability by providing specially crafted HTML. When this arbitrary HTML is parsed and rendered, it can result in an unexpected HTML tree, bypassing input sanitization. This can be leveraged to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution in applications that use the affected component.",
"title": "Vulnerability description"
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{
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"text": "golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important vulnerability in `golang.org/x/net/html` could enable remote attackers to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution. The flaw allows specially crafted HTML to bypass input sanitization during parsing and rendering. Red Hat products are affected if they process untrusted HTML content using the vulnerable component without additional output encoding or robust content security policies.",
"title": "Statement"
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{
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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.",
"title": "CVSS score applicability"
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{
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{
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"url": "https://go.dev/cl/781703"
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{
"category": "external",
"summary": "https://go.dev/issue/79574",
"url": "https://go.dev/issue/79574"
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{
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"summary": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8",
"url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-5029",
"url": "https://pkg.go.dev/vuln/GO-2026-5029"
}
],
"release_date": "2026-05-22T15:01:21.975000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-01T18:46:15+00:00",
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"url": "https://access.redhat.com/errata/RHSA-2026:34357"
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{
"category": "workaround",
"details": "To mitigate this flaw, applications processing untrusted HTML input must implement strict input sanitization and ensure all output is properly encoded before rendering. Deploying a comprehensive Content Security Policy (CSP) can restrict script execution, further reducing the attack surface. Administrators should review application configurations to ensure adequate protection against XSS.",
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
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"details": "Important"
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"title": "golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting"
},
{
"cve": "CVE-2026-27145",
"cwe": {
"id": "CWE-606",
"name": "Unchecked Input for Loop Condition"
},
"discovery_date": "2026-06-02T23:01:08.992540+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2484207"
}
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"notes": [
{
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"text": "A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A flaw was found in the Go standard library crypto/x509 package. When verifying a TLS certificate hostname, VerifyHostname processed each DNS Subject Alternative Name (SAN) entry in a loop and repeatedly split the candidate hostname on \".\" characters. For certificates with a very large DNS SAN list, CPU use could grow quadratically with the number of SAN entries and hostname labels. Because hostname verification runs before the certificate chain is built, this overhead can occur even when the certificate is not trusted.\n\nRed Hat rates this issue as Important. It affects Red Hat products that include the Go standard library crypto/x509 code from an affected Go toolchain version (before Go 1.25.11, or from Go 1.26.0 through Go 1.26.3). Applications and container images built with a fixed Go release (1.25.11 or later, or 1.26.4 or later) are not affected. Community distributions such as Fedora are also affected.\n\nUpstream fix: Go 1.25.11 and Go 1.26.4 (GO-2026-5037).",
"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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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27145"
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{
"category": "external",
"summary": "https://go.dev/cl/783621",
"url": "https://go.dev/cl/783621"
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{
"category": "external",
"summary": "https://go.dev/issue/79694",
"url": "https://go.dev/issue/79694"
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{
"category": "external",
"summary": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw",
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{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-5037",
"url": "https://pkg.go.dev/vuln/GO-2026-5037"
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"title": "crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries"
},
{
"cve": "CVE-2026-33811",
"cwe": {
"id": "CWE-1341",
"name": "Multiple Releases of Same Resource or Handle"
},
"discovery_date": "2026-05-07T20:01:34.913869+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467822"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the `net` package of Go (golang), specifically when using the `LookupCNAME` function with the `cgo` DNS resolver. A remote attacker could exploit this by providing a very long Canonical Name (CNAME) response. This can trigger a double-free of C memory, leading to a crash and a Denial of Service (DoS) for the affected application.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service vulnerability in the Go `net` package, affecting applications configured to use the `cgo` DNS resolver. A remote attacker could trigger a double-free memory error by providing a very long CNAME response, leading to a crash of the vulnerable application and impacting service availability.",
"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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"url": "https://go.dev/issue/78803"
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{
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}
],
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"url": "https://access.redhat.com/errata/RHSA-2026:34357"
},
{
"category": "workaround",
"details": "To mitigate this issue, applications can be configured to use the pure Go DNS resolver instead of the `cgo` DNS resolver. This can be achieved by setting the `GODEBUG` environment variable to `netdns=go`. For example, to run a Go application with this mitigation: `GODEBUG=netdns=go /path/to/your/go/application`. This change may require restarting affected applications or services to take effect. Users should verify that this change does not negatively impact DNS resolution for their specific application environment.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"details": "Important"
}
],
"title": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME"
},
{
"cve": "CVE-2026-39821",
"cwe": {
"id": "CWE-1289",
"name": "Improper Validation of Unsafe Equivalence in Input"
},
"discovery_date": "2026-05-22T16:00:52.844126+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2480756"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "golang.org/x/net/idna is vulnerable to privilege escalation through incorrect Punycode label handling in ToASCII and ToUnicode. An attacker who can supply a Punycode hostname that passes an ASCII-only authorization check may have it normalized to a restricted ASCII name the application intended to block. Red Hat exposure is broad across products shipping the Go toolchain or bundling golang.org/x/net, including RHEL and RHEL-AI golang RPMs, hummingbird Go runtimes, OpenShift and ODF container builds, and Ceph/OpenShift components compiled against affected x/net versions.",
"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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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39821"
},
{
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"summary": "https://go.dev/cl/767220",
"url": "https://go.dev/cl/767220"
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"url": "https://go.dev/issue/78760"
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"url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
},
{
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"summary": "https://pkg.go.dev/vuln/GO-2026-5026",
"url": "https://pkg.go.dev/vuln/GO-2026-5026"
}
],
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{
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"integrityImpact": "HIGH",
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"scope": "CHANGED",
"userInteraction": "NONE",
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],
"title": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing"
},
{
"cve": "CVE-2026-42151",
"cwe": {
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},
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"ids": [
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"notes": [
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "github.com/prometheus/prometheus: Prometheus: Information disclosure of Azure OAuth client secret via config API",
"title": "Vulnerability summary"
},
{
"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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{
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{
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"summary": "https://github.com/prometheus/prometheus/pull/18590",
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{
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{
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],
"release_date": "2026-05-04T18:12:16.917000+00:00",
"remediations": [
{
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"date": "2026-07-01T18:46:15+00:00",
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"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"details": "Important"
}
],
"title": "github.com/prometheus/prometheus: Prometheus: Information disclosure of Azure OAuth client secret via config API"
},
{
"cve": "CVE-2026-42154",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2026-05-04T19:02:19.626646+00:00",
"ids": [
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"title": "Vulnerability description"
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},
{
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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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}
]
}
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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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