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Python CVE-2025-4565

| EUVD-2025-18401 MEDIUM
Uncontrolled Recursion (CWE-674)
2025-06-16 cve-coordination@google.com GHSA-8qvm-5x2c-j2w7
Python Denial Of Service Ubuntu Debian Protobuf Python Red Hat Suse
5.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Ubuntu
MEDIUM
qualitative
SUSE
MEDIUM
qualitative
Red Hat
5.3 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

4
EUVD ID Assigned
Mar 14, 2026 - 21:59 euvd
EUVD-2025-18401
Analysis Generated
Mar 14, 2026 - 21:59 vuln.today
Patch released
Mar 14, 2026 - 21:59 nvd
Patch available
CVE Published
Jun 16, 2025 - 15:15 nvd
MEDIUM 5.3

DescriptionCVE.org

Any project that uses Protobuf Pure-Python backend to parse untrusted Protocol Buffers data containing an arbitrary number of recursive groups, recursive messages or a series of SGROUP tags can be corrupted by exceeding the Python recursion limit. This can result in a Denial of service by crashing the application with a RecursionError. We recommend upgrading to version =>6.31.1 or beyond commit 17838beda2943d08b8a9d4df5b68f5f04f26d901

Analysis

Any project that uses Protobuf Pure-Python backend to parse untrusted Protocol Buffers data containing an arbitrary number of recursive groups, recursive messages or a series of SGROUP tags can be corrupted by exceeding the Python recursion limit. This can result in a Denial of service by crashing the application with a RecursionError. We recommend upgrading to version =>6.31.1 or beyond commit 17838beda2943d08b8a9d4df5b68f5f04f26d901

Technical ContextAI

A denial of service vulnerability allows an attacker to disrupt the normal functioning of a system, making it unavailable to legitimate users. This vulnerability is classified as Uncontrolled Recursion (CWE-674).

RemediationAI

A vendor patch is available — apply it immediately. Implement rate limiting and input validation. Use timeout mechanisms for resource-intensive operations. Deploy DDoS protection where applicable.

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Vendor StatusVendor

Ubuntu

Priority: Medium
protobuf
Release Status Version
upstream released 6.31.1
jammy released 3.12.4-1ubuntu7.22.04.4
noble released 3.21.12-8.2ubuntu0.2
oracular ignored end of life
plucky released 3.21.12-10ubuntu0.1
bionic released 3.0.0-9.1ubuntu1.1+esm3
focal released 3.6.1.3-2ubuntu5.2+esm2
trusty ignored changes too intrusive
xenial released 2.6.1-1.3ubuntu0.1~esm4
USN-7629-1 USN-7629-2

Debian

Bug #1108057
protobuf
Release Status Fixed Version Urgency
bullseye vulnerable 3.12.4-1+deb11u1 -
bookworm vulnerable 3.21.12-3 -
trixie vulnerable 3.21.12-11 -
forky, sid fixed 3.21.12-15 -
(unstable) fixed 3.21.12-12 -

SUSE

Severity: Medium
Product Status
Container suse/manager/5.0/x86_64/server:5.0.5.7.30.1 Container suse/multi-linux-manager/5.1/x86_64/server:5.1.0.6.40 Image server-image Affected
Container suse/sl-micro/6.0/base-os-container:latest Affected
Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Image SLES15-SP4-BYOS-Azure Image SLES15-SP4-HPC-BYOS-Azure Image SLES15-SP4-Hardened-BYOS-Azure Image SLES15-SP4-SAP-Azure Image SLES15-SP4-SAP-BYOS-Azure Image SLES15-SP4-SAP-Hardened-Azure Image SLES15-SP4-SAP-Hardened-BYOS-Azure Image SLES15-SP4-SAPCAL-Azure Affected
Image SLES15-SP4-Manager-Server-4-3-BYOS Image SLES15-SP4-Manager-Server-4-3-BYOS-Azure Image SLES15-SP4-Manager-Server-4-3-BYOS-EC2 Image SLES15-SP4-Manager-Server-4-3-BYOS-GCE Affected

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CVE-2025-4565 vulnerability details – vuln.today
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