9.8

CVE-2026-103877: apache software foundation apache directory ldap api Deserialization of Untrusted Data

CVSS: 9.8v3.1CriticalDeferred
AliasesUBUNTU-CVE-2026-103877DEBIAN-CVE-2026-103877
Published 02-10-2026Last modified 07-10-2026
Open JSON

Vulnerability summary

CVE-2026-103877 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in apache software foundation apache directory ldap api. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.1% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.57%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-10-2026
    PublishedVulnerability first disclosed.
  2. 07-10-2026
    Last modifiedVulnerability information updated.

Description

Deserialization of Untrusted Data vulnerability in Apache Directory LDAP API. A rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's loadSchema() subschema search with a schema object that contains a serialized Java class, allowing some potential RCE. This issue affects Apache Directory LDAP API: from 2.1.0 before 2.1.9. Users are recommended to upgrade to version 2.1.9, which fixes the issue.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

03-10-202618-10-2026
EPSS score
0.57%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apache software foundation1 product
Debian1 product
  • apache-directory-apiAll versions (No fix recorded)
Ubuntu1 product
  • apache-directory-apiAll versions (No fix recorded)

3 vendors · 3 products

References

6 links