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Full vulnerability report · 2026
CVE-2026-68744High confidence

Sssd: sssd: nss responder uninitialized heap disclosure in initgroups reply

Red Hat · Red Hat Enterprise Linux 10

3.3LowCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Low 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 137 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 severityLowOperational priority:Low, unchanged from published severity.unchanged

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

  • Apply the linked authoritative mitigation while planning the permanent fix.
  • 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. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  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 137 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 5 Oct 2026
Debian bookwormbookworm · sourcesssdAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcesssdVendor fix publishedDebian records a fixed source-package version for this release.2.13.1-2Debian Security Tracker ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivesssdUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 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.

1 current
CVE-2026-68744 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysssd: sssd: NSS responder uninitialized heap disclosure in initgroups reply
135 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 sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.
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-2026-52576

No EUVD known-exploited evidence

A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.

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
3.3 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Low 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 137 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 sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.

What

A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.

Why

The product uses or accesses a resource that has not been initialized.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.

Why

The product uses or accesses a resource that has not been initialized.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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 → Use of Uninitialized Resource → cause the confidentiality, integrity or availability impact described by the vendor
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-908 ↗

CWE-908: Use of Uninitialized Resource. The product uses or accesses a resource that has not been initialized.

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:L/I:N/A:N

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.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-908
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-52576Official EUVD mapping

A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.

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-2026-028919Fedora Project等の複数ベンダの製品における初期化されていないリソースの使用に関する脆弱性

SSSDに脆弱性が発見されました。NSSレスポンダのsss_nss_protocol_fill_initgr()関数は、すべてのグループエントリに対して返信スペースを事前に割り当てますが、グループがスキップされた場合にパケットサイズを縮小しないため、初期化されていないヒープのバイトがクライアントに送信されてしまいます。ローカルの攻撃者はこれを悪用して、sssd_nssプロセスからキャッシュされたディレクトリデータやヒープのレイアウト情報を漏洩させる可能性がある脆弱性です。

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
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.
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-2026-68744 - Red Hat Customer Portal →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026CVE-2026-68744 Description A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit thi
04

Evidence and provenance

Published 4 Aug 2026 · Last source change 31 Aug 2026, 18:18 UTC · CWE-908 · Use of Uninitialized Resource

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-2026-52576
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
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. 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 104 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 105 more
    Red Hat Product Security ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: access.redhat.com/CVE-2026-68744; added vendor advisory: bugzilla.redhat.com/show_bug.cgi?id=2509761.
    Before
    no authoritative guidance recorded
    After
    vendor advisory: access.redhat.com/CVE-2026-68744 · vendor advisory: bugzilla.redhat.com/show_bug.cgi?id=2509761
    secalert@redhat.com ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-52576↗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-2026-68744 · cve.blacktree.nl