BlackTreeIndependent security intelligence

Full vulnerability report · 2026

CVE-2026-73196High confidence

Ipa: freeipa: authenticated dos in `otptoken-add` via unbounded otp key decoding/re-encoding

Red Hat · Red Hat Enterprise Linux 10

4.3MediumCVSS 3.1

Recommended action

Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Mitigation available

Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state

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.

Ubuntu release	Source package	Vendor state	Fixed version	Evidence
Ubuntu 24.04 LTSnoble · standard archive	`freeipa`	Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.	`Not published in this feed`	Canonical record ↗Source updated 9 Sept 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-2026-73196 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityipa: FreeIPA: Authenticated DoS in `otptoken-add` via unbounded OTP key decoding/re-encoding

75 known affected

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

ipa-client as a component of Red Hat Enterprise Linux 10
ipa-client-common as a component of Red Hat Enterprise Linux 10
ipa-client-encrypted-dns as a component of Red Hat Enterprise Linux 10
ipa-client-epn as a component of Red Hat Enterprise Linux 10
ipa-client-samba as a component of Red Hat Enterprise Linux 10
ipa-common as a component of Red Hat Enterprise Linux 10
ipa-selinux as a component of Red Hat Enterprise Linux 10
ipa-selinux-luna as a component of Red Hat Enterprise Linux 10
ipa-selinux-nfast as a component of Red Hat Enterprise Linux 10
ipa-server as a component of Red Hat Enterprise Linux 10
ipa-server-common as a component of Red Hat Enterprise Linux 10
ipa-server-dns as a component of Red Hat Enterprise Linux 10

Summary: A flaw was found in FreeIPA. A low-privilege authenticated user can exploit this vulnerability by submitting an oversized One-Time Password (OTP) key value. This oversized key is then decoded and re-encoded without proper size limits, consuming excessive CPU and memory resources. This can lead to a denial of service, degrading the availability of the IPA service.
Remediation: To mitigate this issue, enforce conservative HTTP request-body limits on the `/ipa/session/json` endpoint to reject oversized payloads before they reach the vulnerable IPA parameter conversion. Additionally, if operationally feasible, restrict self-managed token creation to trusted users and implement monitoring or rate-limiting for repeated large authenticated requests. Changes to HTTP server configurations or FreeIPA permissions may require service restarts or reloads to take effect.

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-2026-63241

No EUVD known-exploited evidence

A flaw was found in FreeIPA. A low-privilege authenticated user can exploit this vulnerability by submitting an oversized One-Time Password (OTP) key value. This oversized key is then decoded and re-encoded without proper size limits, consuming excessive CPU and memory resources. This can lead to a denial of service, degrading the availability of the IPA 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: 4.3 · CVSS 3.1
Advisory evidence: No linked advisory details stored yet

Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Mitigation available

What, why and how

What

Why

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

What

Why

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

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: a network path → Allocation of Resources Without Limits or Throttling → disrupt the affected service
Attack surface: Network
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-770 ↗
CWE-770: Allocation of Resources Without Limits or Throttling. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.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.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land: No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.

NetworkDenial of serviceCWE-770

Official authority intelligence

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

ENISA EUVD · EUVD-2026-63241Official EUVD mapping

Official EUVD record

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.: Mitigation available
Affected: ipa-client as a component of Red Hat Enterprise Linux 10; ipa-client-common as a component of Red Hat Enterprise Linux 10; ipa-client-encrypted-dns as a component of Red Hat Enterprise Linux 10; ipa-client-epn as a component of Red Hat Enterprise Linux 10; ipa-client-samba as a component of Red Hat Enterprise Linux 10; ipa-common as a component of Red Hat Enterprise Linux 10; ipa-selinux as a component of Red Hat Enterprise Linux 10; ipa-selinux-luna as a component of Red Hat Enterprise Linux 10; ipa-selinux-nfast as a component of Red Hat Enterprise Linux 10; ipa-server as a component of Red Hat Enterprise Linux 10; ipa-server-common as a component of Red Hat Enterprise Linux 10; ipa-server-dns as a component of Red Hat Enterprise Linux 10; ipa-server-encrypted-dns as a component of Red Hat Enterprise Linux 10; ipa-server-trust-ad as a component of Red Hat Enterprise Linux 10; ipa.src as a component of Red Hat Enterprise Linux 10; python3-ipaclient as a component of Red Hat Enterprise Linux 10; python3-ipalib as a component of Red Hat Enterprise Linux 10; python3-ipaserver as a component of Red Hat Enterprise Linux 10; python3-ipatests as a component of Red Hat Enterprise Linux 10; ipa-admintools as a component of Red Hat Enterprise Linux 6; ipa-client as a component of Red Hat Enterprise Linux 6; ipa-python as a component of Red Hat Enterprise Linux 6; ipa-server as a component of Red Hat Enterprise Linux 6; ipa-server-selinux as a component of Red Hat Enterprise Linux 6; ipa-server-trust-ad as a component of Red Hat Enterprise Linux 6; ipa.src as a component of Red Hat Enterprise Linux 6; ipa-admintools as a component of Red Hat Enterprise Linux 7; ipa-client as a component of Red Hat Enterprise Linux 7; ipa-client-common as a component of Red Hat Enterprise Linux 7; ipa-common as a component of Red Hat Enterprise Linux 7; and 45 more
Fixed: No fixed version is explicitly recorded in the structured CVE data.
Action: No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround: To mitigate this issue, enforce conservative HTTP request-body limits on the `/ipa/session/json` endpoint to reject oversized payloads before they reach the vulnerable IPA parameter conversion. Additionally, if operationally feasible, restrict self-managed token creation to trusted users and implement monitoring or rate-limiting for repeated large authenticated requests. Changes to HTTP server configurations or FreeIPA permissions may require service restarts or reloads to take effect.

Evidence and provenance

Published 20 Aug 2026 · Last source change 20 Aug 2026, 15:19 UTC · CWE-770 · Allocation of Resources Without Limits or Throttling

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 2026-08-23

European sourceENISA EUVD · EUVD-2026-63241

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 →

20 Aug 2026, 15:19 UTC
Vendor guidanceAuthoritative vendor guidance changed from no authoritative guidance recorded to vendor advisory.
Before
no authoritative guidance recorded
After
vendor advisory
secalert@redhat.com ↗
20 Aug 2026, 10:31 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CNA ↗

2026-08-20CVE published

ENISA EUVD · EUVD-2026-63241↗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.