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Python CVE-2025-4565

| EUVDEUVD-2025-18401 MEDIUM
Uncontrolled Recursion (CWE-674)
2025-06-16 cve-coordination@google.com GHSA-8qvm-5x2c-j2w7
Denial Of Service Python Google Debian Ubuntu Red Hat Protobuf Python 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

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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