{"id":"CVE-2026-56859","aliases":["GO-2026-6088","BIT-golang-2026-56859"],"title":"Add recursion depth guard during decode in encoding/xml","summary":"Add recursion depth guard during decode in encoding/xml","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"stdlib","product":"stdlib","ecosystem":"go","affected":["stdlib >= 1.27.0-0, < 1.27.0-rc.3"],"patched":["stdlib 1.27.0-rc.3"],"published":"2026-08-13","updated":"2026-09-21","sourceUpdated":"2026-09-21T10:56:39.139876587Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GO-2026-6088","references":[{"url":"https://go.dev/issue/80481"},{"url":"https://go.dev/cl/803320"},{"url":"https://groups.google.com/g/golang-announce/c/94pEornpRlI"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56859.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-56859"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2515840"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-56859"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56859"},{"url":"https://pkg.go.dev/vuln/GO-2026-6088"},{"url":"https://access.redhat.com/errata/RHSA-2026:68334"},{"url":"https://access.redhat.com/errata/RHSA-2026:68335"},{"url":"https://access.redhat.com/errata/RHSA-2026:66350"},{"url":"https://access.redhat.com/errata/RHSA-2026:66375"},{"url":"https://access.redhat.com/errata/RHSA-2026:66356"},{"url":"https://access.redhat.com/errata/RHSA-2026:68333"},{"url":"https://access.redhat.com/errata/RHSA-2026:65918"},{"url":"https://access.redhat.com/errata/RHSA-2026:61882"},{"url":"https://access.redhat.com/errata/RHSA-2026:67517"},{"url":"https://access.redhat.com/errata/RHSA-2026:65335"},{"url":"https://access.redhat.com/errata/RHSA-2026:67974"},{"url":"https://access.redhat.com/errata/RHSA-2026:66327"},{"url":"https://access.redhat.com/errata/RHSA-2026:60306"},{"url":"https://access.redhat.com/errata/RHSA-2026:63022"},{"url":"https://access.redhat.com/errata/RHSA-2026:65534"},{"url":"https://access.redhat.com/errata/RHSA-2026:62631"},{"url":"https://access.redhat.com/errata/RHSA-2026:65116"},{"url":"https://access.redhat.com/errata/RHSA-2026:65895"},{"url":"https://access.redhat.com/errata/RHSA-2026:67464"},{"url":"https://access.redhat.com/errata/RHSA-2026:63163"},{"url":"https://access.redhat.com/errata/RHSA-2026:60305"},{"url":"https://access.redhat.com/errata/RHSA-2026:62407"},{"url":"https://access.redhat.com/errata/RHSA-2026:66016"},{"url":"https://access.redhat.com/errata/RHSA-2026:67313"},{"url":"https://access.redhat.com/errata/RHSA-2026:67319"},{"url":"https://access.redhat.com/errata/RHSA-2026:62602"},{"url":"https://access.redhat.com/errata/RHSA-2026:65359"},{"url":"https://access.redhat.com/errata/RHSA-2026:62754"},{"url":"https://access.redhat.com/errata/RHSA-2026:67153"},{"url":"https://access.redhat.com/errata/RHSA-2026:62405"},{"url":"https://access.redhat.com/errata/RHSA-2026:65880"},{"url":"https://access.redhat.com/errata/RHSA-2026:62753"},{"url":"https://access.redhat.com/errata/RHSA-2026:62404"},{"url":"https://access.redhat.com/errata/RHSA-2026:65336"},{"url":"https://access.redhat.com/errata/RHSA-2026:62803"},{"url":"https://access.redhat.com/errata/RHSA-2026:60304"},{"url":"https://access.redhat.com/errata/RHSA-2026:62406"},{"url":"https://access.redhat.com/errata/RHSA-2026:65117"},{"url":"https://access.redhat.com/errata/RHSA-2026:62866"},{"url":"https://access.redhat.com/errata/RHSA-2026:62851"},{"url":"https://access.redhat.com/errata/RHSA-2026:54836"},{"url":"https://access.redhat.com/errata/RHSA-2026:54835"}],"tags":["osv","go","csaf","vex","red-hat"],"epss":0.00568,"epssPercentile":0.45572,"cvssSource":"vendor","cwe":["CWE-776"],"ingestedAt":"2026-08-14T19:18:46.525Z","slug":"CVE-2026-56859","body":"## Overview\n\nPreviously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion.\n\n## Affected packages\n\n- `stdlib >= 1.27.0-0, < 1.27.0-rc.3`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `stdlib 1.27.0-rc.3`\n\n## Vendor advisories\n\n- **RHSA-2026:68334** · Red Hat · fixed in: RHEM 1.1 for RHEL 10, RHEM 1.1 for RHEL 9 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68334)\n- **RHSA-2026:68335** · Red Hat · fixed in: RHEM 1.2 for RHEL 10, RHEM 1.2 for RHEL 9 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68335)\n- **RHSA-2026:66350** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:66350)\n- **RHSA-2026:66375** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.20 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:66375)\n- **RHSA-2026:66356** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:66356)\n- **RHSA-2026:68333** · Red Hat · fixed in: Cryostat 4 on RHEL 9 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68333)\n- **RHSA-2026:65918** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65918)\n- **RHSA-2026:61882** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:61882)\n- **RHSA-2026:67517** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67517)\n- **RHSA-2026:65335** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65335)\n- **RHSA-2026:67974** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:67974)\n- **Red Hat VEX** · Important · affected: Assisted Installer for Red Hat OpenShift Container Platform 2, AWS Load Balancer Operator, Builds for Red Hat OpenShift, cert-manager Operator for Red Hat OpenShift, Compliance Operator, Confidential Compute Attestation, … · no fix planned: Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat AI Inference Server, Secrets Management Console for Red Hat OpenShift, Zero Trust Workload Identity Manager - Tech Preview, … · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56859.json)\n- **RHSA-2026:66327** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66327)\n- **RHSA-2026:60306** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60306)\n- **RHSA-2026:63022** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63022)\n- **RHSA-2026:65534** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65534)\n- **RHSA-2026:62631** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62631)\n- **RHSA-2026:65116** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65116)\n- **RHSA-2026:65895** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65895)\n- **RHSA-2026:63163** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-09-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:63163)\n- **RHSA-2026:60305** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60305)\n- **RHSA-2026:62407** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62407)\n- **RHSA-2026:62602** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62602)\n- **RHSA-2026:62754** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62754)\n- **RHSA-2026:62405** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62405)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":5369,"id":"CVE-2026-56859","ts":1788887272568,"field":"cvss","old":null,"new":"7.5"},{"seq":5368,"id":"CVE-2026-56859","ts":1788887272568,"field":"severity","old":"none","new":"high"},{"seq":4252,"id":"CVE-2026-56859","ts":1788886387487,"field":"cvss","old":"7.5","new":null},{"seq":4251,"id":"CVE-2026-56859","ts":1788886387487,"field":"severity","old":"high","new":"none"},{"seq":3190,"id":"CVE-2026-56859","ts":1788883133467,"field":"cvss","old":null,"new":"7.5"},{"seq":3189,"id":"CVE-2026-56859","ts":1788883133467,"field":"severity","old":"none","new":"high"}]}