CVE catalog

CVE-2025-61912

Python LDAP vulnerabilities

Severity: Medium · CVSS 5.5CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Oct 10, 2025, 10:04:25 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.46% · Oct 25, 2026

python-ldap is a lightweight directory access protocol (LDAP) client API for Python. In versions prior to 3.4.5, ldap.dn.escape_dn_chars() escapes \x00 incorrectly by emitting a backslash followed by a literal NUL byte instead of the RFC-4514 hex form \00. Any application that uses this helper to construct DNs from untrusted input can be made to consistently fail before a request is sent to the LDAP server (e.g., AD), resulting in a client-side denial of service. Version 3.4.5 contains a patch for the issue.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	python-ldap	sid	`3.4.8-1`	fixed
Debian	python-ldap	forky	`3.4.8-1`	fixed
Debian	python-ldap	trixie	`3.4.4-1+deb13u1`	fixed
Debian	python-ldap	bookworm	`3.4.3-2+deb12u1`	fixed
Ubuntu	python-ldap	noble	Not reported	vulnerable
Ubuntu	python-ldap	noble	`3.4.4-1ubuntu0.24.04.1`	fixed
Ubuntu	python-ldap-doc	noble	`3.4.4-1ubuntu0.24.04.1`	fixed
Ubuntu	python3-ldap	noble	`3.4.4-1ubuntu0.24.04.1`	fixed
Ubuntu	python3-pyldap	noble	`3.4.4-1ubuntu0.24.04.1`	fixed
Cpe	python-ldap	Not reported	`3.4.5`	fixed
Ubuntu	python-ldap	pro	`3.1.0-2build1`	vulnerable
Ubuntu	python-ldap	pro	`3.1.0-2build2`	vulnerable
Ubuntu	python-ldap	pro	`3.2.0-3`	vulnerable
Ubuntu	python-ldap	pro	`3.2.0-3ubuntu1`	vulnerable
Ubuntu	python-ldap	pro	`3.2.0-3ubuntu2`	vulnerable
Ubuntu	python-ldap	pro	`3.2.0-3ubuntu3`	vulnerable
Ubuntu	python-ldap	pro	`3.2.0-4ubuntu2`	vulnerable
Ubuntu	python-ldap	pro	`3.2.0-4ubuntu2.1`	vulnerable
Ubuntu	python-ldap	pro	`3.2.0-4ubuntu2.1+esm1`	fixed
Ubuntu	python-ldap	22.04	`3.2.0-4ubuntu5`	vulnerable
Ubuntu	python-ldap	22.04	`3.2.0-4ubuntu6`	vulnerable
Ubuntu	python-ldap	22.04	`3.2.0-4ubuntu7`	vulnerable
Ubuntu	python-ldap	22.04	`3.2.0-4ubuntu7.1`	vulnerable
Ubuntu	python-ldap	22.04	`3.2.0-4ubuntu7.2`	fixed
Ubuntu	python-ldap	24.04	`3.4.3-2build2`	vulnerable
Ubuntu	python-ldap	24.04	`3.4.3-2build3`	vulnerable
Ubuntu	python-ldap	24.04	`3.4.3-2ubuntu1`	vulnerable
Ubuntu	python-ldap	24.04	`3.4.4-1`	vulnerable
Ubuntu	python-ldap	24.04	`3.4.4-1build1`	vulnerable
Ubuntu	python-ldap	24.04	`3.4.4-1ubuntu0.24.04.1`	fixed
Ubuntu	python-ldap	25.10	`3.4.4-1build3`	vulnerable
Ubuntu	python-ldap	25.10	`3.4.4-1ubuntu0.25.10.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	python-ldap	source	sid	`3.4.5-1`	not yet assigned	Not reported	[1117859]
Debian	python-ldap	source	forky	`3.4.5-1`	not yet assigned	Not reported	[1117859]
Debian	python-ldap	source	trixie	`3.4.4-1+deb13u1`	not yet assigned	Not reported	[1117859]
Debian	python-ldap	source	bookworm	`3.4.3-2+deb12u1`	not yet assigned	Not reported	[1117859]
Ubuntu	python-ldap	deb	noble	`3.4.4-1ubuntu0.24.04.1`	Not reported	Not reported	Not reported
Ubuntu	python-ldap-doc	deb	noble	`3.4.4-1ubuntu0.24.04.1`	Not reported	Not reported	Not reported
Ubuntu	python3-ldap	deb	noble	`3.4.4-1ubuntu0.24.04.1`	Not reported	Not reported	Not reported
Ubuntu	python3-pyldap	deb	noble	`3.4.4-1ubuntu0.24.04.1`	Not reported	Not reported	Not reported
Cpe	python-ldap	cpe	Not reported	`3.4.5`	Not reported	NVD-CVE-2025-61912	Not reported
Ubuntu	python-ldap	deb	pro	`3.2.0-4ubuntu2.1+esm1`	Not reported	UBUNTU-CVE-2025-61912	Not reported
Ubuntu	python-ldap	deb	22.04	`3.2.0-4ubuntu7.2`	Not reported	UBUNTU-CVE-2025-61912	Not reported
Ubuntu	python-ldap	deb	24.04	`3.4.4-1ubuntu0.24.04.1`	Not reported	UBUNTU-CVE-2025-61912	Not reported
Ubuntu	python-ldap	deb	25.10	`3.4.4-1ubuntu0.25.10.1`	Not reported	UBUNTU-CVE-2025-61912	Not reported

[Debian bug #1117859]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[python3-ldap]Fixed
Source package: [python-ldap]
Details (2)
- 3.4.3-2+deb12u1 · amd64 · bookworm
  Fixed · Fixed: 3.4.3-2+deb12u1
  usn · python-ldap · debian · bookworm; usn · python-ldap · debian · 12
- 3.4.3-2+deb12u1 · arm64 · bookworm
  Fixed · Fixed: 3.4.3-2+deb12u1
  usn · python-ldap · debian · bookworm; usn · python-ldap · debian · 12
[python3-pyldap]Fixed
Source package: [python-ldap]
Details (2)
- 3.4.3-2+deb12u1 · amd64 · bookworm
  Fixed · Fixed: 3.4.3-2+deb12u1
  usn · python-ldap · debian · bookworm; usn · python-ldap · debian · 12
- 3.4.3-2+deb12u1 · arm64 · bookworm
  Fixed · Fixed: 3.4.3-2+deb12u1
  usn · python-ldap · debian · bookworm; usn · python-ldap · debian · 12
[python-ldap-doc]Fixed
Source package: [python-ldap]
Details (2)
- 3.4.3-2+deb12u1 · all · bookworm
  Fixed · Fixed: 3.4.3-2+deb12u1
  usn · python-ldap · debian · bookworm; usn · python-ldap · debian · 12
- 3.4.3-2+deb12u1 · all · bookworm
  Fixed · Fixed: 3.4.3-2+deb12u1
  usn · python-ldap · debian · bookworm; usn · python-ldap · debian · 12

[Debian 13 (Trixie)]

[python3-ldap]Fixed
Source package: [python-ldap]
Details (2)
- 3.4.4-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 3.4.4-1+deb13u1
  usn · python-ldap · debian · 13
- 3.4.4-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.4.4-1+deb13u1
  usn · python-ldap · debian · 13
[python3-pyldap]Fixed
Source package: [python-ldap]
Details (2)
- 3.4.4-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 3.4.4-1+deb13u1
  usn · python-ldap · debian · 13
- 3.4.4-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.4.4-1+deb13u1
  usn · python-ldap · debian · 13
[python-ldap-doc]Fixed
Source package: [python-ldap]
Details (2)
- 3.4.4-1+deb13u1 · all · trixie
  Fixed · Fixed: 3.4.4-1+deb13u1
  usn · python-ldap · debian · 13
- 3.4.4-1+deb13u1 · all · trixie
  Fixed · Fixed: 3.4.4-1+deb13u1
  usn · python-ldap · debian · 13

Observed: Oct 24, 2026, 5:22:24 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]