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CVE-2026-15041

389-ds-base: 389-ds-base: non-constant-time comparison in pbkdf2-sha256 password verification

Products / packages Red Hat Directory Server 11 · Red Hat Directory Server 12 · Red Hat Directory Server 13 · 5 more

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 01:05:31 UTC
redhat · CVSS:3.1 · 3.7
Assessment vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Severity

low3.7

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

A flaw in 389 Directory Server's PBKDF2-SHA256 password verification uses a non-constant-time comparison, potentially allowing a remote attacker to infer partial hash information through timing measurements. The affected products include Red Hat Directory Server 11, 12, and 13, and Red Hat Enterprise Linux 7, 8, 9, and 10. Practical exploitation is extremely difficult due to computational overhead.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Red Hat · redhat

Red Hat Directory Server 11

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:directory_server:11

Red Hat · redhat

Red Hat Directory Server 12

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:directory_server:12

Red Hat · redhat

Red Hat Directory Server 13

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:directory_server:13

Red Hat · redhat

Red Hat Enterprise Linux 10

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux:10

Red Hat · redhat

Red Hat Enterprise Linux 6

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redhat version evidence

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:rhel_els:6

Red Hat · redhat

Red Hat Enterprise Linux 7

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/o:redhat:rhel_els:7

Red Hat · redhat

Red Hat Enterprise Linux 8

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redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux:8

Red Hat · redhat

Red Hat Enterprise Linux 9

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux:9
Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

If possible, configure 389 Directory Server to use an alternative password storage scheme (e.g., SSHA512 or GOST-Yescrypt) which uses constant-time comparison.

redhat guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

A flaw was found in 389 Directory Server. The PBKDF2-SHA256 password verification function uses standard memcmp() for comparing password hashes instead of a constant-time comparison function. A remote attacker could potentially use timing measurements of LDAP bind attempts to infer partial hash information, though practical exploitation is extremely difficult due to PBKDF2 computational overhead.

References

2 sources
access.redhat.com/security/cve/CVE-2026-15041
Security advisoryredhat
bugzilla.redhat.com/show_bug.cgi
Source referenceredhat

Inside the record

Evidence available

Package identity · not supplied
Version evidence · not supplied
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-15041

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-208 ↗

Observable Timing Discrepancy

redhat

Related →
Contributing organizations · 2
redhat

Assigning organization

2026-11-06
CISA-ADP

Additional data publisher

2026-07-08

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

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Large field values are marked as truncated previews. Original source snapshots remain retained.