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No exploitation reportedFix available

CVE-2026-68743

Sssd: sssd: pam responder out-of-bounds read via unchecked auth_token_length in protocol v1

No exploitation reported by the sources we read.

  • Published2026-08-04
  • WeaknessCWE-125

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. The extract_authtok_v1() function in the PAM responder does not validate the auth_token_length field against the remaining buffer size before processing. A local attacker can exploit this via a crafted protocol v1 request to the PAM responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

Timeline

dates in UTC
  1. 2026-08-0418:37CVE 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
—all versionsno 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 2026-11-05

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 · fixed in 2.2.3-3ubuntu0.13+esm1
  • sssdUbuntu:Pro:18.04:LTSall versions · fixed in 1.16.1-1ubuntu1.8+esm1
  • sssdUbuntu:Pro:16.04:LTSall versions · fixed in 1.13.4-1ubuntu1.15+esm1
  • sssdUbuntu:26.04:LTSall versions · fixed in 2.12.0-1ubuntu5.4
  • sssdUbuntu:24.04:LTSall versions · fixed in 2.9.4-1.1ubuntu6.8
  • sssdUbuntu:22.04:LTSall versions · fixed in 2.6.3-1ubuntu3.9
  • sssdTuxCare:OracleLinux:7all versions · fixed in 1.16.5-10.0.5.el7_9.16.tuxcare.els2and 33 other packages
  • sssdTuxCare:OracleLinux:6all versions · fixed in 1.13.3-60.0.4.el6_10.2.tuxcare.els3and 24 other packages

25 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-68743 Red Hat Product Security166 known affected

    sssd: sssd: PAM responder out-of-bounds read via unchecked auth_token_length in protocol v1

    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-2026-68743 · 166 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
  2. No fix available, says the vendor Red Hat Product Security CVE-2026-68743 · 135 productsFix deferred
  3. No fix planned, says the vendor Red Hat Product Security CVE-2026-68743 · 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:H/I:N/A:H
Published
2026-08-04
Last Modified
2026-11-05
NVD status
Analyzed
GitHub Advisory
GHSA-3v6f-w66g-3mv6

Frequently asked questions

What is CVE-2026-68743?

A flaw was found in SSSD. The extract_authtok_v1() function in the PAM responder does not validate the auth_token_length field against the remaining buffer size before processing. A local attacker can exploit this via a crafted protocol v1 request to the PAM responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

Is CVE-2026-68743 actively exploited?

Active exploitation of CVE-2026-68743 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-2026-68743?

CVE-2026-68743 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

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