This Red Hat security update addresses multiple Important-severity vulnerabilities in the opentelemetry-collector for RHEL 9, including a Prometheus denial of service via uncontrolled memory allocation (CVE-2026-42154, CVSS 7.5), an Azure OAuth client secret information disclosure (CVE-2026-42151, CVSS 7.5), and several Go net and crypto library flaws. The Prometheus vulnerabilities affect versions prior to 3.5.3 and from 3.6.0 to before 3.11.3, requiring an update to those fixed versions. The advisory instructs administrators to apply the provided package update, referencing Red Hat's solution article for detailed remediation steps.
Red Hat Product Errata RHSA-2026:34359 - Security Advisory Issued: 2026-07-01 Updated: 2026-07-01 RHSA-2026:34359 - Security Advisory Overview Updated Packages Synopsis Important: opentelemetry-collector security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for opentelemetry-collector is now available for Red Hat Enterprise Linux 9. 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. Description 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. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products Red Hat Enterprise Linux for x86_64 9 x86_64 Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.8 x86_64 Red Hat Enterprise Linux for IBM z Systems 9 s390x Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.8 s390x Red Hat Enterprise Linux for Power, little endian 9 ppc64le Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.8 ppc64le Red Hat Enterprise Linux for ARM 64 9 aarch64 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.8 aarch64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.8 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.8 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.8 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.8 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.8 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.8 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.8 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.8 s390x Fixes BZ - 2466505 - CVE-2026-42154 github.com/prometheus/prometheus: Prometheus: Denial of Service via uncontrolled memory allocation in remote read endpoint BZ - 2466507 - CVE-2026-42151 github.com/prometheus/prometheus: Prometheus: Information disclosure of Azure OAuth client secret via config API BZ - 2467822 - CVE-2026-33811 net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME BZ - 2480756 - CVE-2026-39821 golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing BZ - 2480761 - CVE-2026-25681 golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting BZ - 2484207 - CVE-2026-27145 crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries CVEs CVE-2026-25681 CVE-2026-27145 CVE-2026-33811 CVE-2026-39821 CVE-2026-42151 CVE-2026-42154 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat Enterprise Linux for x86_64 9 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d x86_64 opentelemetry-collector-0.152.1-1.el9_8.x86_64.rpm SHA-256: 9e1c24e9b13c6fdba63a59be7c565231ffc6447e445d061d2065eeacbe3060a5 Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d x86_64 opentelemetry-collector-0.152.1-1.el9_8.x86_64.rpm SHA-256: 9e1c24e9b13c6fdba63a59be7c565231ffc6447e445d061d2065eeacbe3060a5 Red Hat Enterprise Linux for IBM z Systems 9 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d s390x opentelemetry-collector-0.152.1-1.el9_8.s390x.rpm SHA-256: e777bb67e8bda082ff2bfa24bb7119f406faeac5d7b2a97e39cb150463362032 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d s390x opentelemetry-collector-0.152.1-1.el9_8.s390x.rpm SHA-256: e777bb67e8bda082ff2bfa24bb7119f406faeac5d7b2a97e39cb150463362032 Red Hat Enterprise Linux for Power, little endian 9 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d ppc64le opentelemetry-collector-0.152.1-1.el9_8.ppc64le.rpm SHA-256: 6339599896129eef0920debb596a4241ef2da76cc2950871b4022b1976a69602 Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d ppc64le opentelemetry-collector-0.152.1-1.el9_8.ppc64le.rpm SHA-256: 6339599896129eef0920debb596a4241ef2da76cc2950871b4022b1976a69602 Red Hat Enterprise Linux for ARM 64 9 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d aarch64 opentelemetry-collector-0.152.1-1.el9_8.aarch64.rpm SHA-256: 787f6896d00a54a214fce2910b355211ef45a083bb05e1e0bbb04ada336e4d30 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d aarch64 opentelemetry-collector-0.152.1-1.el9_8.aarch64.rpm SHA-256: 787f6896d00a54a214fce2910b355211ef45a083bb05e1e0bbb04ada336e4d30 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d ppc64le opentelemetry-collector-0.152.1-1.el9_8.ppc64le.rpm SHA-256: 6339599896129eef0920debb596a4241ef2da76cc2950871b4022b1976a69602 Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d x86_64 opentelemetry-collector-0.152.1-1.el9_8.x86_64.rpm SHA-256: 9e1c24e9b13c6fdba63a59be7c565231ffc6447e445d061d2065eeacbe3060a5 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d aarch64 opentelemetry-collector-0.152.1-1.el9_8.aarch64.rpm SHA-256: 787f6896d00a54a214fce2910b355211ef45a083bb05e1e0bbb04ada336e4d30 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d s390x opentelemetry-collector-0.152.1-1.el9_8.s390x.rpm SHA-256: e777bb67e8bda082ff2bfa24bb7119f406faeac5d7b2a97e39cb150463362032 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d x86_64 opentelemetry-collector-0.152.1-1.el9_8.x86_64.rpm SHA-256: 9e1c24e9b13c6fdba63a59be7c565231ffc6447e445d061d2065eeacbe3060a5 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d aarch64 opentelemetry-collector-0.152.1-1.el9_8.aarch64.rpm SHA-256: 787f6896d00a54a214fce2910b355211ef45a083bb05e1e0bbb04ada336e4d30 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d ppc64le opentelemetry-collector-0.152.1-1.el9_8.ppc64le.rpm SHA-256: 6339599896129eef0920debb596a4241ef2da76cc2950871b4022b1976a69602 Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.8 SRPM opentelemetry-collector-0.152.1-1.el9_8.src.rpm SHA-256: 32964e73fc2334073dd9622d434ecffbccbc7e3fb7b3c22755cfc08df1892d3d s390x opentelemetry-collector-0.152.1-1.el9_8.s390x.rpm SHA-256: e777bb67e8bda082ff2bfa24bb7119f406faeac5d7b2a97e39cb150463362032 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .