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Full vulnerability report · 2026
CVE-2026-68743High confidence

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

Red Hat · Red Hat Enterprise Linux 10

5.5MediumCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 168 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Low, lowered one band.downgradedsince 31 Aug 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.13% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Red Hat Red Hat Enterprise Linux 10 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: No default targetRemediation target: Normal maintenance

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 168 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

4 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 2 affected package states shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcesssdAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcesssdAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcesssdVendor fix publishedDebian records a fixed source-package version for this release.2.13.1-2Debian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivesssdVendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.2.9.4-1.1ubuntu6.8Canonical Ubuntu Security ↗Source updated 6 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
CVE-2026-68743 · CSAF 2.0 · revision 16 · interimSUSE Product Security TeamCVE-2026-68743
669 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • libipa_hbac-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libipa_hbac0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_certmap0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_idmap-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_idmap0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_nss_idmap-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_nss_idmap0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_simpleifp0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • python-sssd-config as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • sssd as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • sssd-ad as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • sssd-common as component of SUSE Linux Enterprise High Performance Computing 12 SP5
Summary
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.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
CVE-2026-68743 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysssd: sssd: PAM responder out-of-bounds read via unchecked auth_token_length in protocol v1
166 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • 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
  • libsss_idmap as a component of Red Hat Enterprise Linux 10
  • libsss_nss_idmap as a component of Red Hat Enterprise Linux 10
  • libsss_nss_idmap-devel as a component of Red Hat Enterprise Linux 10
  • libsss_sudo as a component of Red Hat Enterprise Linux 10
  • python3-libipa_hbac as a component of Red Hat Enterprise Linux 10
  • python3-libsss_nss_idmap as a component of Red Hat Enterprise Linux 10
  • python3-sss as a component of Red Hat Enterprise Linux 10
  • python3-sss-murmur as a component of Red Hat Enterprise Linux 10
  • python3-sssdconfig as a component of Red Hat Enterprise Linux 10
Summary
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.
Remediation
Mitigation 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.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-52865

No EUVD known-exploited evidence

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.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
5.5 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 168 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

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.

What

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.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

What

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.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Out-of-bounds Read → disrupt the affected service
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-125 ↗

CWE-125: Out-of-bounds Read. The product reads data past the end, or before the beginning, of the intended buffer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
Stolen credentials, tokens and legitimate administration functions may provide continued access without deploying a large custom toolset.
Denial of serviceCWE-125
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-52865Official EUVD mapping

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.

Official EUVD record ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260805Security Bulletin 5 Aug 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 5 Aug 2026, published on 5 August 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-028664Fedora Project等の複数ベンダの製品における境界外読み取りに関する脆弱性

SSSDに脆弱性が発見されました。PAMレスポンダー内のextract_authtok_v1()関数は、処理を行う前にauth_token_lengthフィールドが残りのバッファサイズと整合しているかどうかを検証しません。ローカルの攻撃者は、細工されたプロトコルv1リクエストをPAMレスポンダーのソケットに送信することで、この脆弱性を悪用でき、境界外読み取りやプロセスクラッシュを引き起こし、サービス拒否を発生させる可能性があります。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
Official vendor articles1 stored document

Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.

  • CVE-2026-68743 - Red Hat Customer Portal →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026CVE-2026-68743 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-o
04

Evidence and provenance

Published 4 Aug 2026 · Last source change 31 Aug 2026, 18:11 UTC · CWE-125 · Out-of-bounds Read

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-52865
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    SUSE Product Security Team ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    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; libsss_idmap as a component of Red Hat Enterprise Linux 10; libsss_nss_idmap as a component of Red Hat Enterprise Linux 10; libsss_nss_idmap-devel as a component of Red Hat Enterprise Linux 10; libsss_sudo as a component of Red Hat Enterprise Linux 10; python3-libipa_hbac as a component of Red Hat Enterprise Linux 10; python3-libsss_nss_idmap as a component of Red Hat Enterprise Linux 10; python3-sss as a component of Red Hat Enterprise Linux 10; python3-sss-murmur as a component of Red Hat Enterprise Linux 10; python3-sssdconfig as a component of Red Hat Enterprise Linux 10; sssd as a component of Red Hat Enterprise Linux 10; sssd-ad as a component of Red Hat Enterprise Linux 10; sssd-client as a component of Red Hat Enterprise Linux 10; sssd-common as a component of Red Hat Enterprise Linux 10; sssd-common-pac as a component of Red Hat Enterprise Linux 10; sssd-dbus as a component of Red Hat Enterprise Linux 10; sssd-idp as a component of Red Hat Enterprise Linux 10; sssd-ipa as a component of Red Hat Enterprise Linux 10; sssd-kcm as a component of Red Hat Enterprise Linux 10; sssd-krb5 as a component of Red Hat Enterprise Linux 10; sssd-krb5-common as a component of Red Hat Enterprise Linux 10; sssd-ldap as a component of Red Hat Enterprise Linux 10; sssd-nfs-idmap as a component of Red Hat Enterprise Linux 10; sssd-passkey as a component of Red Hat Enterprise Linux 10; sssd-proxy as a component of Red Hat Enterprise Linux 10; sssd-tools as a component of Red Hat Enterprise Linux 10; sssd-winbind-idmap as a component of Red Hat Enterprise Linux 10; sssd.src as a component of Red Hat Enterprise Linux 10; and 135 more
    After
    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; libsss_idmap as a component of Red Hat Enterprise Linux 10; libsss_nss_idmap as a component of Red Hat Enterprise Linux 10; libsss_nss_idmap-devel as a component of Red Hat Enterprise Linux 10; libsss_sudo as a component of Red Hat Enterprise Linux 10; python3-libipa_hbac as a component of Red Hat Enterprise Linux 10; python3-libsss_nss_idmap as a component of Red Hat Enterprise Linux 10; python3-sss as a component of Red Hat Enterprise Linux 10; python3-sss-murmur as a component of Red Hat Enterprise Linux 10; python3-sssdconfig as a component of Red Hat Enterprise Linux 10; sssd as a component of Red Hat Enterprise Linux 10; sssd-ad as a component of Red Hat Enterprise Linux 10; sssd-client as a component of Red Hat Enterprise Linux 10; sssd-common as a component of Red Hat Enterprise Linux 10; sssd-common-pac as a component of Red Hat Enterprise Linux 10; sssd-dbus as a component of Red Hat Enterprise Linux 10; sssd-idp as a component of Red Hat Enterprise Linux 10; sssd-ipa as a component of Red Hat Enterprise Linux 10; sssd-kcm as a component of Red Hat Enterprise Linux 10; sssd-krb5 as a component of Red Hat Enterprise Linux 10; sssd-krb5-common as a component of Red Hat Enterprise Linux 10; sssd-ldap as a component of Red Hat Enterprise Linux 10; sssd-nfs-idmap as a component of Red Hat Enterprise Linux 10; sssd-passkey as a component of Red Hat Enterprise Linux 10; sssd-proxy as a component of Red Hat Enterprise Linux 10; sssd-tools as a component of Red Hat Enterprise Linux 10; sssd-winbind-idmap as a component of Red Hat Enterprise Linux 10; sssd.src as a component of Red Hat Enterprise Linux 10; and 136 more
    Red Hat Product Security ↗
  3. Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: access.redhat.com/CVE-2026-68743; added vendor advisory: bugzilla.redhat.com/show_bug.cgi?id=2509760.
    Before
    no authoritative guidance recorded
    After
    vendor advisory: access.redhat.com/CVE-2026-68743 · vendor advisory: bugzilla.redhat.com/show_bug.cgi?id=2509760
    secalert@redhat.com ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Remediation guidance recorded
ENISA EUVD · EUVD-2026-52865↗SUSE Product Security Team security advisory↗CVE authority or vendor reference↗Vendor advisory↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-68743 · cve.blacktree.nl