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No exploitation reportedFix available

CVE-2026-90996

Sssd: sssd: denial of service in nss responder via crafted zero-length requests

No exploitation reported by the sources we read.

  • Published2026-09-14
  • WeaknessCWE-191

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A flaw was found in sssd. A local unprivileged user could send a specially crafted request with a zero-length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the availability of the system responder.

Timeline

dates in UTC
  1. 2026-09-1415:55CVE publishedCNA

Versions per branch

NVD
Redhat enterprise linux
BranchAffectedFixed in
7.0= 7.0no fix published
8.0= 8.0no fix published
9.0= 9.0no fix published
10.0= 10.0no fix published
Fedoraproject sssd
BranchAffectedFixed in
2.12= 2.12.0no fix published
Redhat openshift container platform
BranchAffectedFixed in
4.0= 4.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA8 products

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

2 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-06

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • sssdUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • sssdUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • sssdUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • sssdUbuntu:26.10all versions · no fixed version listed
  • sssdUbuntu:26.04:LTSall versions · no fixed version listed
  • sssdUbuntu:24.04:LTSall versions · no fixed version listed
  • sssdUbuntu:22.04:LTSall versions · no fixed version listed
  • sssdTuxCare:AlmaLinux:9.6all versions · fixed in 2.9.6-4.el9_6.2.tuxcare.els8and 34 other packages

10 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-90996 Red Hat Product Security166 known affected

    sssd: sssd: Denial of Service in NSS responder via crafted zero-length requests

    libipa_hbac as a component of Red Hat Enterprise Linux 10 · libsss_autofs as a component of Red Hat Enterprise Linux 10 · libsss_certmap as a component of Red Hat Enterprise Linux 10 · +163 more

Full record on NVD

Fix

  1. Workaround from the vendor Red Hat Product Security CVE-2026-90996 · 166 productsThere's no appropriated mitigation for this issue.
  2. No fix available, says the vendor Red Hat Product Security CVE-2026-90996 · 135 productsFix deferred
  3. No fix planned, says the vendor Red Hat Product Security CVE-2026-90996 · 31 productsOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published
2026-09-14
Last Modified
2026-11-06
NVD status
Analyzed
GitHub Advisory
GHSA-xg93-wm7f-rmcx

Frequently asked questions

What is CVE-2026-90996?

A flaw was found in sssd. A local unprivileged user could send a specially crafted request with a zero-length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the availability of the system responder.

Is CVE-2026-90996 actively exploited?

Active exploitation of CVE-2026-90996 has not been confirmed. Its EPSS score was 0.1% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-90996?

CVE-2026-90996 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record