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NVD / CVE Program· CNA redhat

CVE-2026-15722: 389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica id parsing

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.83% (FIRST EPSS); higher than 57.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: 389-ds-base (AlmaLinux:10) 3.2.0-9.el10_2; 389-ds-base-bdb (AlmaLinux:10) 3.2.0-9.el10_2; 389-ds-base-devel (AlmaLinux:10) 3.2.0-9.el10_2.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to 389-ds-base (AlmaLinux:10) 3.2.0-9.el10_2; 389-ds-base-bdb (AlmaLinux:10) 3.2.0-9.el10_2; 389-ds-base-devel (AlmaLinux:10) 3.2.0-9.el10_2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval() function in repl5_ruv.c copies digit characters from a network-supplied RUV berval into a fixed 16-byte stack buffer without bounds checking. A remote unauthenticated attacker can crash the LDAP server by sending a crafted StartNSDS50ReplicationRequest extended operation containing a replica ID field with more than 16 digit characters. The overflow occurs during payload decoding, before any authorization check. Stack protectors limit impact to denial of service.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jul 31, 2026
Updated
Nov 4, 2026
EPSS
0.8% · 57th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
redhatdirectory server
redhat389 directory server
redhatenterprise linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat 389 directory serverall versions
  • redhat directory server11.0
  • redhat directory server12.0
  • redhat enterprise linux10.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8

    • 8060020260908152739.0ca98e7e and laternot affected · rpm

  • Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8

    • 8080020260806114250.f969626e and laternot affected · rpm

  • Red Hat Red Hat Directory Server 11.9 for RHEL 8

    • 8100020260803140625.37ed7c03 and laternot affected · rpm

  • Red Hat Red Hat Directory Server 12

    • all versionsaffected

  • Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9

    • 9020020260730155601.1674d574 and laternot affected · rpm

  • Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9

    • 9040020260810131422.1674d574 and laternot affected · rpm

  • Red Hat Red Hat Directory Server 13

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 10

    • 0:3.2.0-9.el10_2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

    • 0:3.0.6-20.el10_0 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

    • 0:1.3.11.1-14.el7_9 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8

    • 8100020260806150504.25e700aa and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10389-ds-basebefore 3.2.0-9.el10_23.2.0-9.el10_2
AlmaLinux:10389-ds-base-bdbbefore 3.2.0-9.el10_23.2.0-9.el10_2
AlmaLinux:10389-ds-base-develbefore 3.2.0-9.el10_23.2.0-9.el10_2
AlmaLinux:10389-ds-base-libsbefore 3.2.0-9.el10_23.2.0-9.el10_2
AlmaLinux:10389-ds-base-snmpbefore 3.2.0-9.el10_23.2.0-9.el10_2
AlmaLinux:10python3-lib389before 3.2.0-9.el10_23.2.0-9.el10_2
AlmaLinux:8389-ds-basebefore 1.4.3.39-26.module_el8.10.0+4254+e9c4b4001.4.3.39-26.module_el8.10.0+4254+e9c4b400
AlmaLinux:8389-ds-base-develbefore 1.4.3.39-26.module_el8.10.0+4254+e9c4b4001.4.3.39-26.module_el8.10.0+4254+e9c4b400
AlmaLinux:8389-ds-base-legacy-toolsbefore 1.4.3.39-26.module_el8.10.0+4254+e9c4b4001.4.3.39-26.module_el8.10.0+4254+e9c4b400
AlmaLinux:8389-ds-base-libsbefore 1.4.3.39-26.module_el8.10.0+4254+e9c4b4001.4.3.39-26.module_el8.10.0+4254+e9c4b400
AlmaLinux:8389-ds-base-snmpbefore 1.4.3.39-26.module_el8.10.0+4254+e9c4b4001.4.3.39-26.module_el8.10.0+4254+e9c4b400
AlmaLinux:8python3-lib389before 1.4.3.39-26.module_el8.10.0+4254+e9c4b4001.4.3.39-26.module_el8.10.0+4254+e9c4b400
AlmaLinux:9389-ds-basebefore 2.8.0-9.el9_82.8.0-9.el9_8
AlmaLinux:9389-ds-base-develbefore 2.8.0-9.el9_82.8.0-9.el9_8
AlmaLinux:9389-ds-base-libsbefore 2.8.0-9.el9_82.8.0-9.el9_8
AlmaLinux:9389-ds-base-snmpbefore 2.8.0-9.el9_82.8.0-9.el9_8
AlmaLinux:9python3-lib389before 2.8.0-9.el9_82.8.0-9.el9_8
Debian:12389-ds-basefrom 0—
openSUSE:Tumbleweed389-dsbefore 3.3.1+8c2711bd6-1.13.3.1+8c2711bd6-1.1
Red Hat:directory_server_e4s:11.5::el8389-ds-basebefore 0:1.4.3.34-9.module+el8dsrv+24847+c94540a60:1.4.3.34-9.module+el8dsrv+24847+c94540a6
Red Hat:directory_server_e4s:11.5::el8389-ds-base-debuginfobefore 0:1.4.3.34-9.module+el8dsrv+24847+c94540a60:1.4.3.34-9.module+el8dsrv+24847+c94540a6
Red Hat:directory_server_e4s:11.5::el8389-ds-base-debugsourcebefore 0:1.4.3.34-9.module+el8dsrv+24847+c94540a60:1.4.3.34-9.module+el8dsrv+24847+c94540a6
Red Hat:directory_server_e4s:11.5::el8389-ds-base-develbefore 0:1.4.3.34-9.module+el8dsrv+24847+c94540a60:1.4.3.34-9.module+el8dsrv+24847+c94540a6
Red Hat:directory_server_e4s:11.5::el8389-ds-base-legacy-toolsbefore 0:1.4.3.34-9.module+el8dsrv+24847+c94540a60:1.4.3.34-9.module+el8dsrv+24847+c94540a6

+96

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2008-2928Multiple buffer overflows in the adminutil library in CGI applications in Red Hat Directory Server 7.1 before SP7 allow remote attackers to
    42Plan
  • CVE-2008-0892The replication monitor CGI script (repl-monitor-cgi.pl) in Red Hat Administration Server, as used by Red Hat Directory Server 8.0 EL4 and E
    40Plan
  • CVE-2008-1677Buffer overflow in the regular expression handler in Red Hat Directory Server 8.0 and 7.1 before SP6 allows remote attackers to cause a deni
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-15041Jul 8, 2026 · 389-ds-base: 389-ds-base: non-constant-time comparison in pbkdf2-sha256 password verification
    14Monitor
  • ← EarlierCVE-2026-11770Jul 31, 2026 · 389-ds-base: 389-ds-base: pre-auth ldap filter injection in cleanallruv status check
    30Monitor
  • Later →CVE-2026-18651Aug 3, 2026 · 389-ds-base: 389-ds-base: sasl plain bind installs connection credentials before account-lock check, allowing continued access as a locked account
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:389-ds-base2.8.0-9.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:389-ds-base-bdb3.2.0-9.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:389-ds-base-devel2.8.0-9.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:389-ds-base-legacy-tools1.4.3.39-26.module_el8.10.0+4254+e9c4b400 · AlmaLinux:8Package registry (OSV)
almalinux:389-ds-base-libs2.8.0-9.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:389-ds-base-snmp2.8.0-9.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3-lib3892.8.0-9.el9_8 · AlmaLinux:9Package registry (OSV)
opensuse:389-ds3.3.1+8c2711bd6-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:389-ds-base0:2.2.4-20.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-bdb0:3.2.0-9.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:389-ds-base-bdb-debuginfo0:3.2.0-9.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:389-ds-base-debuginfo0:2.2.4-20.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-debugsource0:2.2.4-20.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-devel0:2.8.0-9.el9_8 · Red Hat:enterprise_linux:9::crbPackage registry (OSV)
red hat:389-ds-base-legacy-tools0:1.4.3.39-26.module+el8.10.0+24634+ded7774b · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:389-ds-base-libs0:2.2.4-20.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-libs-debuginfo0:2.2.4-20.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-snmp0:2.8.0-9.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:389-ds-base-snmp-debuginfo0:2.2.4-20.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:python3-lib3890:2.2.4-20.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
rocky linux:389-ds-base0:2.8.0-9.el9_8 · Rocky Linux:9Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (17 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records