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ALSA-2026:34357 — Important: opentelemetry-collector security update

Affected: AlmaLinux:10: opentelemetry-collector

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.

bdu:2026-09275

BELL-CVE-2026-27145

Affected: Alpaquita:23: go, Alpaquita:25: go, Alpaquita:stream: go, BellSoft Hardened Containers:23: go, BellSoft Hardened Containers:25: go, BellSoft Hardened Containers:stream: go

BIT-golang-2026-27145 — Inefficient candidate hostname parsing in crypto/x509

Affected: Bitnami: golang

(*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 costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.

certfr-2026-avi-1249 — De multiples vulnérabilités ont été découvertes dans les produits VMware. Elles permettent à un attaquant de provoquer…

certfr-2026-avi-1249

Withdrawn: CLEANSTART-2026-AG91746 — Security fixes for CVE-2026-25680, CVE-2026-25681, CVE-2026-26958, CVE-2026-27145, CVE-2026-29181, CVE-2026-32952, CVE-…

Withdrawn by the publisher.

Affected: CleanStart: dex

Multiple security vulnerabilities affect the dex package. These issues are resolved in later releases. See references for individual vulnerability details.

EUVD-2026-371758

fkie_cve-2026-27145

GHSA-4279-q6mj-392r

msrc_CVE-2026-27145 — Inefficient candidate hostname parsing in crypto/x509

msrc_CVE-2026-27145

openSUSE-SU-2026:10959-1 — go1.25-1.25.11-1.1 on GA media

go1.25-1.25.11-1.1 on GA media

RHSA-2026:23262 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame net/mail: golang: Go net/mail: Denial of Service via crafted email inputs golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing html/template: golang: Go html/template: Cross-Site Scripting via improper URL escaping in meta tag content net/http/httputil: golang: net/http/httputil: ReverseProxy forwards hidden query parameters, potentially bypassing security controls html/template: golang: html/template: Cross-site scripting due to incorrect script tag escaping net: golang: Go net package: Denial of Service via NUL byte in Dial and LookupPort on Windows cmd/go: golang: Go command (cmd/go): Integrity bypass due to checksum validation flaw via malicious module proxy mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header net/textproto: golang: Golang net/textproto: Misleading error messages via input injection golang.org/x/crypto/ssh/knownhosts: golang: golang.org/x/crypto/ssh/knownhosts: Revocation bypass via unchecked SignatureKey golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Authorization bypass due to skipped source-address validation

RLSA-2026:29981 — Moderate: golang security, bug fix, and enhancement update

Affected: Rocky Linux:9: golang

The golang packages provide the Go programming language compiler.

Security Fix(es):

* net/textproto: golang: Golang net/textproto: Misleading error messages via input injection (CVE-2026-42507)

Bug Fix(es) and Enhancement(s):

* Update Go to version 1.26.4+1 [rhel-9.8.z] (JIRA:Rocky Linux-183350)

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.

SUSE-SU-2026:22154-1 — Security update for go1.26

Security update for go1.26

UBUNTU-CVE-2026-27145

Affected: Ubuntu:22.04:LTS: golang-1.24, Ubuntu:24.04:LTS: golang-1.24, Ubuntu:25.10: golang-1.24, Ubuntu:25.10: golang-1.25, Ubuntu:26.04:LTS: golang-1.24, Ubuntu:26.04:LTS: golang-1.25, Ubuntu:26.04:LTS: golang-1.26

WID-SEC-W-2026-1776 — Golang Go: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Golang Go ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen, um einen Denial of Service durchzuführen, und um falsche Informationen darzustellen.