Summary
Collector with the supported components for a AlmaLinux 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.
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | opentelemetry-collector | 0.152.1-1.el9_8 |
Vulnerabilities 6
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Critical 9.6
Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna
The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege …
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High 7.5
Crash when handling long CNAME response in net
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
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High 7.5
Prometheus Azure AD remote write OAuth client secret exposed via config API
Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the client_secret field in the Azure AD remote write OAuth configuration (storage/remote/azuread) was typed as string instead of Secret. Prometheus re…
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High 7.5CVE-2026-42154 Public exploit
Prometheus: remote read endpoint allows denial of service via crafted snappy payload
Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the remote read endpoint (/api/v1/read) does not validate the declared decoded length in a snappy-compressed request body before allocating memory. An…
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Medium 6.5CVE-2026-27145 Public exploit
Inefficient candidate hostname parsing in crypto/x509
(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification c…
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Medium 6.1
Invoking incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/html
Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.
References
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report
https://access.redhat.com/security/cve/CVE-2026-25681
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report
https://access.redhat.com/security/cve/CVE-2026-27145
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report
https://access.redhat.com/security/cve/CVE-2026-33811
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report
https://access.redhat.com/security/cve/CVE-2026-39821
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report
https://access.redhat.com/security/cve/CVE-2026-42151
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report
https://access.redhat.com/security/cve/CVE-2026-42154
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report
https://bugzilla.redhat.com/2466505
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report
https://bugzilla.redhat.com/2466507
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report
https://bugzilla.redhat.com/2467822
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report
https://bugzilla.redhat.com/2480756
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report
https://bugzilla.redhat.com/2480761
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report
https://bugzilla.redhat.com/2484207
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advisory
https://errata.almalinux.org/9/ALSA-2026-34359.html