Description
A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption API via the timed processing of valid PKCS#1 v1.5 Ciphertext. The highest threat from this vulnerability is to confidentiality.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | m2crypto | All released versions of m2crypto | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | m2crypto | 0.38.0-4 | — |
| Debian 12 | m2crypto | 0.38.0-4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | m2crypto | No fix yet | — |
| Ubuntu 25.10 | m2crypto | No fix yet | — |
| Ubuntu 24.04 LTS | m2crypto | No fix yet | — |
| Ubuntu 22.04 LTS | m2crypto | No fix yet | — |
| Ubuntu 20.04 LTS | m2crypto | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | m2crypto | No fix yet | — |
| Ubuntu 16.04 LTS | m2crypto | No fix yet | — |
| Ubuntu 14.04 LTS | m2crypto | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhev Manager 4 | ovirt-web-ui | 1.6.7-1.el8ev | RHSA-2021:1169 |
| Red Hat Rhev Manager 4 | rhvm +19 | 4.4.5.9-0.1.el8ev | RHSA-2021:1169 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | python3-M2Crypto | 0.44.0-150600.19.3.1 | SUSE-RU-2025:0796-1 |
| SLES 15 SP5 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SLES 15 SP4 | python-M2Crypto | 0.38.0-150400.3.3.1 | SUSE-SU-2022:2691-1, SUSE-SU-2022:2532-1, SUSE-FU-2024:1448-1 |
| SLES 15 SP4 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SLES 15 SP3 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLES 15 SP2 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
Show 35 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLES 15 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLES 12 SP5 | python-M2Crypto | 0.29.0-23.8.1 | SUSE-SU-2022:2527-1 |
| SLES 12 SP4 | python-M2Crypto | 0.29.0-23.8.1 | SUSE-SU-2022:2527-1 |
| SLES 12 SP3 | python-M2Crypto | 0.29.0-23.8.1 | SUSE-SU-2022:2527-1 |
| SLES 12 SP2 | python-M2Crypto | 0.29.0-23.8.1 | SUSE-SU-2022:2527-1 |
| SLES 12 | python-M2Crypto | 0.29.0-23.8.1 | SUSE-SU-2022:2527-1 |
| SLES 3 | python-M2Crypto | 0.40.0-150400.3.9.1 | SUSE-FU-2024:1448-1 |
| SLES 2 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLES for SAP 15 SP5 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SLES for SAP 15 SP4 | python-M2Crypto | 0.40.0-150400.3.9.1 | SUSE-FU-2024:1448-1 |
| SLES for SAP 15 SP4 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SLES for SAP 15 SP2 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLES for SAP 15 SP1 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLES for SAP 15 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLES for SAP 12 SP5 | python-M2Crypto | 0.29.0-23.8.1 | SUSE-SU-2022:2527-1 |
| SLES for SAP 12 SP4 | python-M2Crypto | 0.29.0-23.8.1 | SUSE-SU-2022:2527-1 |
| SLE Micro 5.5 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SLE Micro 5.4 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SLE Micro 5.3 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SLE Micro 5.2 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLE Micro 5.1 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLE HPC 15 SP5 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SLE HPC 15 SP4 | python-M2Crypto | 0.40.0-150400.3.9.1 | SUSE-FU-2024:1448-1 |
| SLE HPC 15 SP4 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SLE HPC 15 SP2 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLE HPC 15 SP1 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SLE HPC 15 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SUSE OpenStack Cloud Crowbar 9 | python-M2Crypto | 0.29.0-23.8.1 | SUSE-SU-2022:2527-1 |
| SUSE OpenStack Cloud 9 | python-M2Crypto | 0.29.0-23.8.1 | SUSE-SU-2022:2527-1 |
| SUSE Manager Server 4.3 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SUSE Manager Server 4.1 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SUSE Manager Retail Branch Server 4.1 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SUSE Manager Proxy 4.3 | python3-M2Crypto | 0.44.0-150400.13.1 | SUSE-RU-2025:0800-1 |
| SUSE Manager Proxy 4.1 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SUSE Enterprise Storage 7 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
| SUSE Enterprise Storage 6 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | python3-M2Crypto | 0.44.0-150600.19.3.1 | SUSE-RU-2025:0796-1 |
| openSUSE Leap 15.5 | python-M2Crypto | 0.40.0-150400.3.9.1 | SUSE-FU-2024:1448-1 |
| openSUSE Leap 15.4 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2691-1, SUSE-SU-2022:2562-1, SUSE-SU-2022:2532-1 |
| openSUSE Leap 15.3 | python-M2Crypto | 0.35.2-150000.3.14.1 | SUSE-SU-2022:2562-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.2 | python-M2Crypto | 0.35.2-150000.3.14.1 | openSUSE-SU-2022:2562-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | m2crypto | 0.38.0-3 | — |
| Azure Linux 2 (CBL-Mariner) | m2crypto | 0.38.0-3 | — |
Advisories 10
- RHSA-2021:1169 Red Hat Security Advisory: RHV Manager (ovirt-engine) 4.4.z [ovirt-4.4.5] security, bug fix, enhancement Red Hat Security Advisories (RHSA) · Feb 24, 2026
- SUSE-FU-2024:1448-1 Feature update for python-M2Crypto SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-RU-2025:0800-1 Recommended update for python3-M2Crypto SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2691-1 Security update for python-M2Crypto SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-RU-2025:0796-1 Recommended update for python3-M2Crypto SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2562-1 Security update for python-M2Crypto SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2527-1 Security update for python-M2Crypto SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:2562-1 Security update for python-M2Crypto SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2532-1 Security update for python-M2Crypto SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-0808 Red Hat Virtualization Engine: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 22, 2025