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CVE-2026-104046

Sssd: sssd: denial of service via incomplete identity provider authentication requests

6.2 Medium

A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP) authentication is enabled, pre-authentication requests retain state in memory without being cleared or timed out. A local attacker can repeatedly initiate authentication flows without completing them, causing unbounded memory consumption. This memory exhaustion can lead to a Denial of Service (DoS) by degrading or terminating SSSD authentication services.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.16%Unchanged since Oct 7, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.2

Sssd: sssd: denial of service via incomplete identity provider authentication requests

A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP) authentication is enabled, pre-authentication requests retain state in memory without being cleared or timed out. A local attacker can repeatedly initiate authentication flows without completing them, causing unbounded memory consumption. This memory exhaustion can lead to a Denial of Service (DoS) by degrading or terminating SSSD authentication services.

Record
CVE-2026-104046
CVSS 3.1
6.2 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-770
Updated
2026-11-05
EUVDEUVD-2026-93984 6.2

A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP) authentication is enabled, pre-authentication requests retain state in memory without being cleared or timed out. A local attacker can repeatedly initiate authentication flows without completing them, causing unbounded memory consumption. This memory exhaustion can lead to a Denial of Service (DoS) by degrading or terminating SSSD authentication services.

Record
EUVD-2026-93984
CVSS 3.1
6.2 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-05
GitHub AdvisoriesGHSA-35vq-gvvv-mccw 6.2

A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP)...

A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP) authentication is enabled, pre-authentication requests retain state in memory without being cleared or timed out. A local attacker can repeatedly initiate authentication flows without completing them, causing unbounded memory consumption. This memory exhaustion can lead to a Denial of Service (DoS) by degrading or terminating SSSD authentication services.

Record
GHSA-35vq-gvvv-mccw
CVSS 3.1
6.2 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-770
Updated
2026-11-02
NVD 6.2

A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP) authentication is enabled, pre-authentication requests retain state in memory without being cleared or timed out. A local attacker can repeatedly initiate authentication flows without completing them, causing unbounded memory consumption. This memory exhaustion can lead to a Denial of Service (DoS) by degrading or terminating SSSD authentication services.

Record
CVE-2026-104046
CVSS 3.1
6.2 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-770
Updated
2026-11-05
OSV 6.2

Sssd: sssd: denial of service via incomplete identity provider authentication requests

A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP) authentication is enabled, pre-authentication requests retain state in memory without being cleared or timed out. A local attacker can repeatedly initiate authentication flows without completing them, causing unbounded memory consumption. This memory exhaustion can lead to a Denial of Service (DoS) by degrading or terminating SSSD authentication services.

Record
CVE-2026-104046
CVSS 3.1
6.2 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-770
Updated
2026-11-07
OSVDEBIAN-CVE-2026-104046 6.2

A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP) authentication is enabled, pre-authentication requests retain state in memory without being cleared or timed out. A local attacker can repeatedly initiate authentication flows without completing them, causing unbounded memory consumption. This memory exhaustion can lead to a Denial of Service (DoS) by degrading or terminating SSSD authentication services.

Record
DEBIAN-CVE-2026-104046
CVSS 3.1
6.2 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-07
OSVUBUNTU-CVE-2026-104046 6.2

A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP) authentication is enabled, pre-authentication requests retain state in memory without being cleared or timed out. A local attacker can repeatedly initiate authentication flows without completing them, causing unbounded memory consumption. This memory exhaustion can lead to a Denial of Service (DoS) by degrading or terminating SSSD authentication services.

Record
UBUNTU-CVE-2026-104046
CVSS 3.1
6.2 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
sssd
Debian:12
 All versions, plus listed versions
2.10.1-12.10.1-22.11.1-12.11.1-22.11.1-2.1
Show 22 moreShow less
2.12.0-12.12.0-22.12.0-3~exp02.12.0-42.13.1-12.13.1-22.13.1-32.13.1-42.8.2-42.8.2-4+deb12u12.9.1-12.9.1-22.9.2-12.9.4-12.9.4-1.12.9.4-1.1~exp12.9.4-22.9.5-12.9.5-22.9.5-32.9.5-42.9.5-5
 None known
sssd
Debian:13
 All versions, plus listed versions
2.10.1-22.11.1-12.11.1-22.11.1-2.12.12.0-1
Show 7 moreShow less
2.12.0-22.12.0-3~exp02.12.0-42.13.1-12.13.1-22.13.1-32.13.1-4
 None known
sssd
Debian:14
 All versions, plus listed versions
2.10.1-22.11.1-12.11.1-22.11.1-2.12.12.0-1
Show 7 moreShow less
2.12.0-22.12.0-3~exp02.12.0-42.13.1-12.13.1-22.13.1-32.13.1-4
 None known
sssd
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.12.5-21.13.1-21.13.2-11.13.3-11.13.4-1
Show 15 moreShow less
1.13.4-1ubuntu11.13.4-1ubuntu1.11.13.4-1ubuntu1.21.13.4-1ubuntu1.51.13.4-1ubuntu1.61.13.4-1ubuntu1.71.13.4-1ubuntu1.81.13.4-1ubuntu1.91.13.4-1ubuntu1.101.13.4-1ubuntu1.111.13.4-1ubuntu1.121.13.4-1ubuntu1.131.13.4-1ubuntu1.141.13.4-1ubuntu1.151.13.4-1ubuntu1.15+esm1
 None known
sssd
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.15.3-2ubuntu11.15.3-3ubuntu11.16.0-5ubuntu11.16.0-5ubuntu21.16.1-1ubuntu1
Show 9 moreShow less
1.16.1-1ubuntu1.11.16.1-1ubuntu1.21.16.1-1ubuntu1.31.16.1-1ubuntu1.41.16.1-1ubuntu1.51.16.1-1ubuntu1.61.16.1-1ubuntu1.71.16.1-1ubuntu1.81.16.1-1ubuntu1.8+esm1
 None known
sssd
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2.2.0-4ubuntu12.2.2-12.2.2-1ubuntu12.2.3-1.1ubuntu12.2.3-2
Show 14 moreShow less
2.2.3-32.2.3-3ubuntu0.12.2.3-3ubuntu0.22.2.3-3ubuntu0.32.2.3-3ubuntu0.42.2.3-3ubuntu0.62.2.3-3ubuntu0.72.2.3-3ubuntu0.82.2.3-3ubuntu0.92.2.3-3ubuntu0.102.2.3-3ubuntu0.112.2.3-3ubuntu0.122.2.3-3ubuntu0.132.2.3-3ubuntu0.13+esm1
 None known
sssd
Ubuntu:22.04:LTS
 All versions, plus listed versions
2.4.1-2ubuntu42.5.2-4ubuntu12.5.2-4ubuntu32.5.2-4ubuntu42.6.1-1ubuntu3
Show 9 moreShow less
2.6.3-1ubuntu32.6.3-1ubuntu3.12.6.3-1ubuntu3.22.6.3-1ubuntu3.32.6.3-1ubuntu3.42.6.3-1ubuntu3.52.6.3-1ubuntu3.62.6.3-1ubuntu3.82.6.3-1ubuntu3.9
 None known
sssd
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.9.1-2ubuntu22.9.1-2ubuntu32.9.2-1ubuntu22.9.4-1ubuntu12.9.4-1.1ubuntu3
Show 10 moreShow less
2.9.4-1.1ubuntu52.9.4-1.1ubuntu62.9.4-1.1ubuntu6.12.9.4-1.1ubuntu6.22.9.4-1.1ubuntu6.32.9.4-1.1ubuntu6.42.9.4-1.1ubuntu6.52.9.4-1.1ubuntu6.62.9.4-1.1ubuntu6.72.9.4-1.1ubuntu6.8
 None known
sssd
Ubuntu:26.10
 All versions, plus listed versions
2.12.0-1ubuntu52.12.0-4ubuntu12.12.0-4ubuntu22.12.0-4ubuntu32.12.0-4ubuntu4
 None known
sssd
Ubuntu:26.04:LTS
 All versions, plus listed versions
2.10.1-2ubuntu52.10.1-2ubuntu72.12.0-1ubuntu32.12.0-1ubuntu42.12.0-1ubuntu5
Show 5 moreShow less
2.12.0-1ubuntu5.12.12.0-1ubuntu5.22.12.0-1ubuntu5.32.12.0-1ubuntu5.42.12.0-1ubuntu5.5
 None known

History

History
RecordedChangedSources
affectedOSV
affectedEUVD, NVD, OSV
facts, productsCVE List
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-104046 is a medium vulnerability (CVSS 6.2) in Fedoraproject Sssd, published October 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 5th percentile. No source names a fixed version.

References

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