RHSA-2026:88340 — Security Advisory

An update for grafana is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.

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.

Grafana is an open source, feature rich metrics dashboard and graph editor for Graphite, InfluxDB & OpenTSDB.

Security Fix(es):

• golang: net/http: net/http: sensitive headers incorrectly sent after cross-domain redirect (CVE-2024-45336)

• crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec (CVE-2025-22866)

• crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption (CVE-2025-68121)

• crypto/x509: Incorrect enforcement of email constraints in crypto/x509 (CVE-2026-27137)

• crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281)

• crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)

• golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282)

• crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283)

• crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)

• net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)

• net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)

• golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)

• mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)

• 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)

• html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)

• crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)

• encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)

• crypto/x509: golang: crypto/x509: Man-in-the-middle attacks via untrusted intermediate certificates (CVE-2026-111943)

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.