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CVE Record

CVE-2026-11774: 389-ds-base: 389-ds-base: integer overflow in sasl packet length bypasses size limit leading to heap buffer overflow

An integer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), adding sizeof(uint32_t) to a crafted SASL packet length prefix of 0xFFFFFFFC causes unsigned wraparound to zero, bypassing the nsslapd-maxsasliosize limit and leading to a heap buffer overflow of up to approximately 2 megabytes of attacker-controlled data. After a successful SASL bind with integrity protection (SSF > 0), a remote attacker can cause a Denial of Service (DoS) or achieve Remote Code Execution (RCE). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, enrolled host, or service account can trigger this vulnerability over the network. This flaw is independent of CVE-2025-14905, which patched schema.c only and did not modify sasl_io.c.

HighCVSS 7.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-11774 affects 389 Directory Server in Red Hat Directory Server, RHEL, FreeIPA, and Red Hat Identity Management contexts. A logged-in domain user or service account can send malformed SASL traffic after authentication, potentially crashing the directory service or enabling code execution.

Executive priority

Treat as a high-priority identity infrastructure issue. The vulnerability can affect core directory services, may be reachable by low-privileged authenticated principals, and carries denial-of-service plus possible remote code execution impact.

Technical view

The flaw is an integer overflow in sasl_io_start_packet(). A crafted SASL packet length can wrap when sizeof(uint32_t) is added, bypass nsslapd-maxsasliosize, and trigger a heap buffer overflow after a successful SASL bind with SSF greater than zero.

Likely exposure

Exposure is most likely in Red Hat 389-ds-base/redhat-ds deployments, including listed RHEL 7 ELS, RHEL 8, RHEL 9, RHEL 10, and Red Hat Directory Server streams. FreeIPA and Red Hat IdM environments are notable because ordinary domain credentials may be sufficient.

Exploitation context

The provided sources do not report active exploitation, and KEV is false. Exploitation requires network access plus a successful SASL bind with integrity protection, so this is not unauthenticated, but domain users, enrolled hosts, or service accounts may qualify.

Researcher notes

This is distinct from CVE-2025-14905; the source states that earlier fix changed schema.c only, not sasl_io.c. Focus review on SASL I/O length handling and authenticated SASL sessions with SSF greater than zero.

Mitigation direction

  • Identify all 389-ds-base and redhat-ds deployments in affected Red Hat streams.
  • Apply the relevant Red Hat RHSA updates for each product stream.
  • Check Red Hat CVE guidance for exact fixed packages and any stream-specific instructions.
  • Prioritize FreeIPA and Red Hat IdM servers reachable by domain users or service accounts.
  • Restrict directory service exposure while patching, where operationally feasible.

Validation and detection

  • Compare installed 389-ds-base or redhat-ds versions with affected versions in Red Hat advisories.
  • Confirm each server has received the matching RHSA update for its RHEL or Directory Server stream.
  • Inventory FreeIPA and Red Hat IdM systems using Kerberos-backed SASL authentication.
  • Review directory service availability logs for unexplained crashes or restarts.
  • Verify nsslapd-maxsasliosize is not treated as sufficient protection for this flaw.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-190: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-11774 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
21Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H2.84.7redhat
7.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H2.84.7redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.6High
CVSS 3.1 vector shape for CVE-2026-11774Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. ADP timelineredhat-SADP

    Reported to Red Hat.

  2. Source timelineredhat

    Reported to Red Hat.

  3. ADP timelineredhat-SADP

    Made public.

  4. Source timelineredhat

    Made public.

  5. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADP389-ds-base: 389-ds-base: integer overflow in SASL packet length bypasses size limit leading to heap buffer overflow
other:Red Hat severity ratingcvssV3_1
  • 2026-04-16T00:00:00.000Z: Reported to Red Hat.
  • 2026-06-04T21:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat Directory Server 11.5 E4S for RHEL 8redhat-ds:11, 8060020260702180044.0ca98e7eaffected
Red HatRed Hat Directory Server 11.7 E4S for RHEL 8redhat-ds:11, 8080020260702180836.f969626eaffected
Red HatRed Hat Directory Server 11.9 for RHEL 8redhat-ds:11, 8100020260702145313.37ed7c03affected
Red HatRed Hat Directory Server 12.2 E4S for RHEL 9redhat-ds:12, 9020020260703060155.1674d574affected
Red HatRed Hat Directory Server 12.4 E4S for RHEL 9redhat-ds:12, 9040020260703055735.1674d574affected
Red HatRed Hat Enterprise Linux 10389-ds-base, 0:3.2.0-8.el10_2affected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support389-ds-base, 0:3.0.6-19.el10_0affected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support389-ds-base, 0:1.3.11.1-13.el7_9affected
Red HatRed Hat Enterprise Linux 8389-ds:1.4, 8100020260626120929.25e700aaaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support389-ds:1.4, 8040020260629123121.96015a92affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On389-ds:1.4, 8040020260629123121.96015a92affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support389-ds:1.4, 8060020260626130540.824efc52affected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On389-ds:1.4, 8060020260626130540.824efc52affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service389-ds:1.4, 8080020260630025241.6dbb3803affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions389-ds:1.4, 8080020260630025241.6dbb3803affected
Red HatRed Hat Enterprise Linux 9389-ds-base, 0:2.8.0-8.el9_8affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions389-ds-base, 0:2.2.4-19.el9_2affected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions389-ds-base, 0:2.4.5-26.el9_4affected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support389-ds-base, 0:2.6.1-22.el9_6affected
Red HatRed Hat Directory Server 13.2dirsrv/dirsrv-container-rhel10, 1783452100affected
Red HatRed Hat Directory Server 12redhat-ds:12/389-ds-baseaffected
Red HatRed Hat Directory Server 13389-ds-baseunaffected
Red HatRed Hat Enterprise Linux 6389-ds-baseunaffected
Weakness

CWE details

CWE-190

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-190 · source CWE mapping

Integer Overflow or Wraparound

Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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