A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.
CVE-2026-104036
MEDIUMPre-NVD 5.85.8—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 5.8 from GitHub Security Advisory published 2026-10-06. A secondary CVSS source baseline 5.8; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
5.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: <0.1%CVSS: 5.8Exploit: None knownExposed services: Not assessed
No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.
- CVSS v3
- 5.8
- EG Score
- 5.8MEDIUMhigh confidence
- EG Risk
- 26EG Risk 26/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity58% × 45%Exploitation0% × 40%Automatability0% × 15%CISA SSVC: Track at every mission impact level.Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix. - EPSS PROB
- <0.1%
- EPSS %ILE
- below the 1st
- KEV
- Not listed
CISA SSVCTrack at every mission impact level.
No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
October 6, 2026
Last Modified
October 6, 2026
Advisory Details (2)
Auto-updated Oct 6, 2026No fix on record yet. Sources: redhat.
redhat
2479057 – (CVE-2026-104036) CVE-2026-104036 sssd: sssd: Denial of service via out-of-bounds write in NFS idmap plugin
https://bugzilla.redhat.com/show_bug.cgi?id=2479057redhatMentions a patch (unverified)
CVE-2026-104036 - Red Hat Customer Portal
Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a
https://access.redhat.com/security/cve/CVE-2026-104036Vendor Advisories for CVE-2026-104036(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 11× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-07 16:03 UTCGHSA enrichment
- 2026-10-06 15:31 UTCEG score recompute
- 2026-10-06 15:31 UTCGHSA enrichment
- 2026-10-06 15:17 UTCEPSS rescore
- 2026-10-06 13:29 UTCEG score recompute
- 2026-10-06 13:29 UTCGHSA enrichment
- 2026-10-06 13:04 UTCEG score recompute
- 2026-10-06 13:04 UTCGHSA enrichment
- 2026-10-06 01:32 UTCEG score recompute
- 2026-10-06 00:41 UTCEG score recompute
- 2026-10-06 00:40 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-104036?
CVE-2026-104036 is a medium vulnerability published on October 6, 2026. A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to…
When was CVE-2026-104036 disclosed?
CVE-2026-104036 was first published on October 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-104036 actively exploited?
CVE-2026-104036 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a <0.1% probability of exploitation in the next 30 days (below the 1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-104036?
CVE-2026-104036 has a CVSS base score of 5.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-104036?
No fix for CVE-2026-104036 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-104036 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-104036
Is Your Infrastructure Affected by CVE-2026-104036?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.