PT-2025-25564 · Protobuf+6 · Protobuf+6

CVE-2025-4565 · Published 2025-05-14 · Updated 2026-07-09

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Protobuf versions prior to 6.31.1

Description The issue affects projects that use the Protobuf Pure-Python backend to parse untrusted Protocol Buffers data. This data can contain an arbitrary number of recursive groups, recursive messages, or a series of SGROUP tags, which can cause the application to exceed the Python recursion limit. As a result, this can lead to a Denial of Service by crashing the application with a RecursionError.

Recommendations For versions prior to 6.31.1, upgrade to version 6.31.1 or beyond commit 17838beda2943d08b8a9d4df5b68f5f04f26d901 to resolve the issue.

Exploit

Fix

DoS

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

AZL-64116

AZL-64145

BDU:2025-10926

CLEANSTART-2026-FU07345

CLEANSTART-2026-KE11953

CLEANSTART-2026-NM83456

CLEANSTART-2026-QE89118

CVE-2025-4565

ECHO-869D-3EC4-EFD0

GHSA-8QVM-5X2C-J2W7

OESA-2025-1713

OESA-2025-1714

OESA-2025-1798

OESA-2025-1799

OESA-2025-1800

OESA-2025-1801

OPENSUSE-SU-2025:15265-1

OPENSUSE-SU-2026:20390-1

PYSEC-2026-1806

RHSA-2026:1249

SUSE-SU-2025:02309-1

SUSE-SU-2025:02310-1

SUSE-SU-2025:02311-1

SUSE-SU-2025:20514-1

SUSE-SU-2025:20672-1

SUSE-SU-2025:3722-1

SUSE-SU-2025_02309-1

SUSE-SU-2025_02310-1

SUSE-SU-2025_02311-1

SUSE-SU-2025_3722-1

SUSE-SU-2026:1653-1

SUSE-SU-2026:20753-1

SUSE-SU-2026:20907-1

USN-7629-1

USN-7629-2

Affected Products

Astra Linux

Debian

Linuxmint

Protobuf

Red Os

Suse

Ubuntu

References · 239

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/4xxx/CVE-2025-4565.json · Exploit
• https://github.com/protocolbuffers/protobuf/commit/17838beda2943d08b8a9d4df5b68f5f04f26d901 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-44307 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2024-52303 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-34513 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-69230 · Security Note
• https://cve.org/CVERecord?id=CVE-2025-4565 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-34514 · Security Note
• https://osv.dev/vulnerability/ROOT-APP-PYPI-CVE-2025-4565 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-4565 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:20514-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-4565 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27205 · Security Note
• https://osv.dev/vulnerability/OESA-2025-1799 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-69229 · Security Note