# CVE-2025-4565: Unbounded recursion in Python Protobuf CVE-2025-4565 is fixed in 21 products on 1 platform, first by elpa-protobuf-mode 3.12.4-1ubuntu7.22.04.4, released June 16, 2025. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2025-4565 - Priority: Routine - CVSS: 5.3 (Important) - EPSS: 0.0026 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 16, 2025 - Weakness: Uncontrolled Recursion - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-4565 ## Description Any project that uses Protobuf Pure-Python backend to parse untrustedProtocol Buffers data containing an arbitrary number of recursive groups,recursive messages or a series of SGROUP tags can be corrupted by exceedingthe Python recursion limit. This can result in a Denial of service bycrashing the application with a RecursionError. We recommend upgrading toversion =>6.31.1 or beyond commit 17838beda2943d08b8a9d4df5b68f5f04f26d901 ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | elpa-protobuf-mode Ubuntu 22.04.1 LTS (jammy) | 3.12.4-1ubuntu7.22.04.4 | [elpa-protobuf-mode 3.12.4-1ubuntu7.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-elpa-protobuf-mode-3.12.4-1ubuntu7.22.04.4.md) | Jun 16, 2025 | | Linux | elpa-protobuf-mode Ubuntu 24.04.5 LTS (noble) | 3.21.12-8.2ubuntu0.2 | [elpa-protobuf-mode 3.21.12-8.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-elpa-protobuf-mode-3.21.12-8.2ubuntu0.2.md) | Jun 16, 2025 | | Linux | elpa-protobuf-mode Ubuntu 25.04 (plucky) | 3.21.12-10ubuntu0.1 | [elpa-protobuf-mode 3.21.12-10ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-elpa-protobuf-mode-3.21.12-10ubuntu0.1.md) | Jan 16, 2026 | | Linux | libprotobuf-java Ubuntu 18.04.6 LTS (bionic) | 3.0.0-9.1ubuntu1.1+esm3 | [libprotobuf-java 3.0.0-9.1ubuntu1.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libprotobuf-java-3.0.0-9.1ubuntu1.1-esm3.md) | Jun 16, 2025 | | Linux | libprotobuf-java Ubuntu 20.04 LTS (focal) | 3.6.1.3-2ubuntu5.2+esm2 | [libprotobuf-java 3.6.1.3-2ubuntu5.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libprotobuf-java-3.6.1.3-2ubuntu5.2-esm2.md) | Jun 16, 2025 | | Linux | libprotobuf-java Ubuntu 22.04.1 LTS (jammy) | 3.12.4-1ubuntu7.22.04.4 | [libprotobuf-java 3.12.4-1ubuntu7.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libprotobuf-java-3.12.4-1ubuntu7.22.04.4.md) | Jun 16, 2025 | | Linux | libprotobuf-java Ubuntu 24.04.5 LTS (noble) | 3.21.12-8.2ubuntu0.2 | [libprotobuf-java 3.21.12-8.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libprotobuf-java-3.21.12-8.2ubuntu0.2.md) | Jun 16, 2025 | | Linux | libprotobuf-java Ubuntu 25.04 (plucky) | 3.21.12-10ubuntu0.1 | [libprotobuf-java 3.21.12-10ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libprotobuf-java-3.21.12-10ubuntu0.1.md) | Jan 16, 2026 | | Linux | libprotobuf-lite10 Ubuntu 18.04.6 LTS (bionic) | 3.0.0-9.1ubuntu1.1+esm3 | [libprotobuf-lite10 3.0.0-9.1ubuntu1.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libprotobuf-lite10-3.0.0-9.1ubuntu1.1-esm3.md) | Jun 16, 2025 | | Linux | libprotobuf-lite17 Ubuntu 20.04 LTS (focal) | 3.6.1.3-2ubuntu5.2+esm2 | [libprotobuf-lite17 3.6.1.3-2ubuntu5.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libprotobuf-lite17-3.6.1.3-2ubuntu5.2-esm2.md) | Jun 16, 2025 | | Linux | libprotobuf-lite23 Ubuntu 22.04.1 LTS (jammy) | 3.12.4-1ubuntu7.22.04.4 | [libprotobuf-lite23 3.12.4-1ubuntu7.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libprotobuf-lite23-3.12.4-1ubuntu7.22.04.4.md) | Jun 16, 2025 | | Linux | libprotobuf-lite32t64 Ubuntu 24.04.5 LTS (noble) | 3.21.12-8.2ubuntu0.2 | [libprotobuf-lite32t64 3.21.12-8.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libprotobuf-lite32t64-3.21.12-8.2ubuntu0.2.md) | Jun 16, 2025 | | Linux | libprotobuf-lite32t64 Ubuntu 25.04 (plucky) | 3.21.12-10ubuntu0.1 | [libprotobuf-lite32t64 3.21.12-10ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libprotobuf-lite32t64-3.21.12-10ubuntu0.1.md) | Jan 16, 2026 | | Linux | libprotobuf10 Ubuntu 18.04.6 LTS (bionic) | 3.0.0-9.1ubuntu1.1+esm3 | [libprotobuf10 3.0.0-9.1ubuntu1.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libprotobuf10-3.0.0-9.1ubuntu1.1-esm3.md) | Jun 16, 2025 | | Linux | libprotobuf17 Ubuntu 20.04 LTS (focal) | 3.6.1.3-2ubuntu5.2+esm2 | [libprotobuf17 3.6.1.3-2ubuntu5.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libprotobuf17-3.6.1.3-2ubuntu5.2-esm2.md) | Jun 16, 2025 | | Linux | libprotobuf23 Ubuntu 22.04.1 LTS (jammy) | 3.12.4-1ubuntu7.22.04.4 | [libprotobuf23 3.12.4-1ubuntu7.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libprotobuf23-3.12.4-1ubuntu7.22.04.4.md) | Jun 16, 2025 | | Linux | libprotobuf32t64 Ubuntu 24.04.5 LTS (noble) | 3.21.12-8.2ubuntu0.2 | [libprotobuf32t64 3.21.12-8.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libprotobuf32t64-3.21.12-8.2ubuntu0.2.md) | Jun 16, 2025 | | Linux | libprotobuf32t64 Ubuntu 25.04 (plucky) | 3.21.12-10ubuntu0.1 | [libprotobuf32t64 3.21.12-10ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libprotobuf32t64-3.21.12-10ubuntu0.1.md) | Jan 16, 2026 | | Linux | libprotoc10 Ubuntu 18.04.6 LTS (bionic) | 3.0.0-9.1ubuntu1.1+esm3 | [libprotoc10 3.0.0-9.1ubuntu1.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libprotoc10-3.0.0-9.1ubuntu1.1-esm3.md) | Jun 16, 2025 | | Linux | libprotoc17 Ubuntu 20.04 LTS (focal) | 3.6.1.3-2ubuntu5.2+esm2 | [libprotoc17 3.6.1.3-2ubuntu5.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libprotoc17-3.6.1.3-2ubuntu5.2-esm2.md) | Jun 16, 2025 | | Linux | libprotoc23 Ubuntu 22.04.1 LTS (jammy) | 3.12.4-1ubuntu7.22.04.4 | [libprotoc23 3.12.4-1ubuntu7.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libprotoc23-3.12.4-1ubuntu7.22.04.4.md) | Jun 16, 2025 | | Linux | libprotoc32t64 Ubuntu 24.04.5 LTS (noble) | 3.21.12-8.2ubuntu0.2 | [libprotoc32t64 3.21.12-8.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libprotoc32t64-3.21.12-8.2ubuntu0.2.md) | Jun 16, 2025 | | Linux | libprotoc32t64 Ubuntu 25.04 (plucky) | 3.21.12-10ubuntu0.1 | [libprotoc32t64 3.21.12-10ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libprotoc32t64-3.21.12-10ubuntu0.1.md) | Jan 16, 2026 | | Linux | php-google-protobuf Ubuntu 24.04.5 LTS (noble) | 3.21.12-8.2ubuntu0.2 | [php-google-protobuf 3.21.12-8.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php-google-protobuf-3.21.12-8.2ubuntu0.2.md) | Jun 16, 2025 | | Linux | php-google-protobuf Ubuntu 25.04 (plucky) | 3.21.12-10ubuntu0.1 | [php-google-protobuf 3.21.12-10ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-php-google-protobuf-3.21.12-10ubuntu0.1.md) | Jan 16, 2026 | | Linux | protobuf Debian 12.15 (bookworm) | 3.21.12-3+deb12u1 | [DEBIAN-CVE-2025-4565](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4565.md) | Jun 16, 2025 | | Linux | protobuf Debian 13.5 (trixie) | 3.21.12-11+deb13u1 | [DEBIAN-CVE-2025-4565](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4565.md) | Jun 16, 2025 | | Linux | protobuf Debian 14 | 3.21.12-12 | [DEBIAN-CVE-2025-4565](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4565.md) | Jun 16, 2025 | | Linux | protobuf opensuse-leap 15.6 | 25.1-150600.16.13.1 | [SUSE-SU-2025:02311-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02311-1.md) | Jul 15, 2025 | | Linux | protobuf opensuse-leap 16.0 | 28.3-160000.3.1 | [OPENSUSE-SU-2026:20390-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20390-1.md) | Mar 18, 2026 | | Linux | protobuf sles 15.6 | 3.9.2-150200.4.27.1 | [SUSE-SU-2025:3722-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3722-1.md) | Oct 22, 2025 | | Linux | protobuf sles 15.7 | 3.9.2-150200.4.27.1 | [SUSE-SU-2025:3722-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3722-1.md) | Oct 22, 2025 | | Linux | protobuf sles 16.0 | 28.3-160000.3.1 | [SUSE-SU-2026:20907-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20907-1.md) | Mar 18, 2026 | | Linux | protobuf-compiler Ubuntu 18.04.6 LTS (bionic) | 3.0.0-9.1ubuntu1.1+esm3 | [protobuf-compiler 3.0.0-9.1ubuntu1.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-protobuf-compiler-3.0.0-9.1ubuntu1.1-esm3.md) | Jun 16, 2025 | | Linux | protobuf-compiler Ubuntu 20.04 LTS (focal) | 3.6.1.3-2ubuntu5.2+esm2 | [protobuf-compiler 3.6.1.3-2ubuntu5.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-protobuf-compiler-3.6.1.3-2ubuntu5.2-esm2.md) | Jun 16, 2025 | | Linux | protobuf-compiler Ubuntu 22.04.1 LTS (jammy) | 3.12.4-1ubuntu7.22.04.4 | [protobuf-compiler 3.12.4-1ubuntu7.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-protobuf-compiler-3.12.4-1ubuntu7.22.04.4.md) | Jun 16, 2025 | | Linux | protobuf-compiler Ubuntu 24.04.5 LTS (noble) | 3.21.12-8.2ubuntu0.2 | [protobuf-compiler 3.21.12-8.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-protobuf-compiler-3.21.12-8.2ubuntu0.2.md) | Jun 16, 2025 | | Linux | protobuf-compiler Ubuntu 25.04 (plucky) | 3.21.12-10ubuntu0.1 | [protobuf-compiler 3.21.12-10ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-protobuf-compiler-3.21.12-10ubuntu0.1.md) | Jan 16, 2026 | | Linux | protobuf-java opensuse-leap 16.0 | 28.3-160000.3.1 | [OPENSUSE-SU-2026:20390-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20390-1.md) | Mar 18, 2026 | | Linux | protobuf-java sles 16.0 | 28.3-160000.3.1 | [SUSE-SU-2026:20907-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20907-1.md) | Mar 18, 2026 | | Linux | python-protobuf Ubuntu 18.04.6 LTS (bionic) | 3.0.0-9.1ubuntu1.1+esm3 | [python-protobuf 3.0.0-9.1ubuntu1.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-protobuf-3.0.0-9.1ubuntu1.1-esm3.md) | Jun 16, 2025 | | Linux | python-protobuf Ubuntu 20.04 LTS (focal) | 3.6.1.3-2ubuntu5.2+esm2 | [python-protobuf 3.6.1.3-2ubuntu5.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-protobuf-3.6.1.3-2ubuntu5.2-esm2.md) | Jun 16, 2025 | | Linux | python-protobuf opensuse-leap 16.0 | 5.28.3-160000.3.1 | [OPENSUSE-SU-2026:20390-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20390-1.md) | Mar 18, 2026 | | Linux | python-protobuf sles 16.0 | 5.28.3-160000.3.1 | [SUSE-SU-2026:20907-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20907-1.md) | Mar 18, 2026 | | Linux | python3-protobuf Ubuntu 18.04.6 LTS (bionic) | 3.0.0-9.1ubuntu1.1+esm3 | [python3-protobuf 3.0.0-9.1ubuntu1.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-protobuf-3.0.0-9.1ubuntu1.1-esm3.md) | Jun 16, 2025 | | Linux | python3-protobuf Ubuntu 20.04 LTS (focal) | 3.6.1.3-2ubuntu5.2+esm2 | [python3-protobuf 3.6.1.3-2ubuntu5.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-protobuf-3.6.1.3-2ubuntu5.2-esm2.md) | Jun 16, 2025 | | Linux | python3-protobuf Ubuntu 22.04.1 LTS (jammy) | 3.12.4-1ubuntu7.22.04.4 | [python3-protobuf 3.12.4-1ubuntu7.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-protobuf-3.12.4-1ubuntu7.22.04.4.md) | Jun 16, 2025 | | Linux | python3-protobuf Ubuntu 24.04.5 LTS (noble) | 3.21.12-8.2ubuntu0.2 | [python3-protobuf 3.21.12-8.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-protobuf-3.21.12-8.2ubuntu0.2.md) | Jun 16, 2025 | | Linux | python3-protobuf Ubuntu 25.04 (plucky) | 3.21.12-10ubuntu0.1 | [python3-protobuf 3.21.12-10ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-python3-protobuf-3.21.12-10ubuntu0.1.md) | Jan 16, 2026 | | Linux | ruby-google-protobuf Ubuntu 20.04 LTS (focal) | 3.6.1.3-2ubuntu5.2+esm2 | [ruby-google-protobuf 3.6.1.3-2ubuntu5.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ruby-google-protobuf-3.6.1.3-2ubuntu5.2-esm2.md) | Jun 16, 2025 | | Linux | ruby-google-protobuf Ubuntu 22.04.1 LTS (jammy) | 3.12.4-1ubuntu7.22.04.4 | [ruby-google-protobuf 3.12.4-1ubuntu7.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ruby-google-protobuf-3.12.4-1ubuntu7.22.04.4.md) | Jun 16, 2025 | | Linux | ruby-google-protobuf Ubuntu 24.04.5 LTS (noble) | 3.21.12-8.2ubuntu0.2 | [ruby-google-protobuf 3.21.12-8.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ruby-google-protobuf-3.21.12-8.2ubuntu0.2.md) | Jun 16, 2025 | | Linux | ruby-google-protobuf Ubuntu 25.04 (plucky) | 3.21.12-10ubuntu0.1 | [ruby-google-protobuf 3.21.12-10ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-ruby-google-protobuf-3.21.12-10ubuntu0.1.md) | Jan 16, 2026 | --- Data as of 2026-11-08T00:53:09Z UTC. 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