Description
An exploitable denial-of-service vulnerability exists in the X509 certificate parser of Python.org Python 2.7.11 / 3.6.6. A specially crafted X509 certificate can cause a NULL pointer dereference, resulting in a denial of service. An attacker can initiate or accept TLS connections using crafted certificates to trigger this vulnerability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Python | Python.org CPython 2.7.11 Python.org CPython 3.6.6 Python.org CPython 3.5.2 Python.org CPython 3 master at 480833808e918a1dcebbbcfd07d5a8de3c5c2a66 | — |
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 11 | python2.7 | 2.7.15-6 | — |
| Debian 9 | python2.7 | 2.7.13-2+deb9u4 | DLA-2337-1 |
| Debian 9 | python3.5 | 3.5.3-1+deb9u2 | DLA-2280-1 |
| Debian 8 | python2.7 | 2.7.9-2+deb8u3 | DLA-1834-1 |
| Debian 8 | python3.4 | 3.4.2-1+deb8u2 | DLA-1663-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | python3.10 | 3.10.12-1~22.04.4 | USN-6891-1 |
| Ubuntu 20.04 LTS | python3.8 | 3.8.10-0ubuntu1~20.04.10 | USN-6891-1 |
| Ubuntu 18.04 LTS | python2.7 | 2.7.15-4ubuntu4~18.04.1 | USN-4127-1 |
| Ubuntu 18.04 LTS | python3.6 | 3.6.8-1~18.04.2 | USN-4127-1 |
| Ubuntu 16.04 LTS | python2.7 | 2.7.12-1ubuntu0~16.04.8 | USN-4127-1 |
| Ubuntu 16.04 LTS | python3.5 | 3.5.2-2ubuntu0~16.04.8 | USN-4127-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | python3.11 | 3.11.0~rc1-1~22.04.1~esm1 | USN-6891-1 |
| Ubuntu Pro 20.04 LTS | python3.9 | 3.9.5-3ubuntu0~20.04.1+esm2 | USN-6891-1 |
| Ubuntu Pro 18.04 LTS | python3.6 | 3.6.9-1~18.04ubuntu1.13+esm2 | USN-6891-1 |
| Ubuntu Pro 18.04 LTS | python3.7 | 3.7.5-2ubuntu1~18.04.2+esm3 | USN-6891-1 |
| Ubuntu Pro 18.04 LTS | python3.8 | 3.8.0-3ubuntu1~18.04.2+esm2 | USN-6891-1 |
| Ubuntu Pro 16.04 LTS | python3.5 | 3.5.2-2ubuntu0~16.04.13+esm13 | USN-6891-1 |
| Ubuntu Pro 14.04 LTS | python2.7 | 2.7.6-8ubuntu0.6+esm2 | USN-4127-2 |
| Ubuntu Pro 14.04 LTS | python3.4 | 3.4.3-1ubuntu1~14.04.7+esm2 | USN-4127-2 |
| Ubuntu Pro 14.04 LTS | python3.5 | 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1 | USN-6891-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | python3 +7 | 3.6.8-15.1.el8 | RHSA-2019:3520 |
| RHEL 7 | python +6 | 2.7.5-86.el7 | RHSA-2019:2030 |
| RHEL 3 | rh-python36-python +6 | 3.6.9-2.el6 | RHSA-2019:3725 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | python3 +1 | 3.6.12-3.67.2 | SUSE-SU-2020:3930-1 |
| SLES 15 SP1 | python | 2.7.17-7.32.2 | SUSE-SU-2020:0234-1 |
| SLES 15 SP1 | python-base | 2.7.17-7.32.1 | SUSE-SU-2020:0234-1 |
| SLES 15 SP1 | python3 +1 | 3.6.10-3.42.2 | SUSE-SU-2020:3930-1, SUSE-SU-2020:0114-1 |
| SLES 15 SP1 | python3-core | 3.6.12-3.67.2 | SUSE-SU-2020:3930-1 |
| SLES 15 | python +1 | 2.7.14-7.6.1 | SUSE-SU-2020:0234-1, SUSE-SU-2019:0271-1 |
| SLES 15 | python3 +1 | 3.6.5-3.8.1 | SUSE-SU-2020:3930-1, SUSE-SU-2020:0114-1, SUSE-SU-2019:0215-1 |
| SLES 15 | python3-core | 3.6.12-3.67.2 | SUSE-SU-2020:3930-1 |
| SLES 12 SP5 | python36 +1 | 3.6.10-4.3.5 | SUSE-SU-2020:3563-1, SUSE-SU-2020:0302-1 |
| SLES 12 SP5 | python36-core | 3.6.12-4.22.2 | SUSE-SU-2020:3563-1 |
| SLES 12 SP4 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SLES 12 SP4 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SLES 12 SP3 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
| SLES 12 SP2 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SLES 12 SP2 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
| SLES 12 SP1 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SLES 12 SP1 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
| SLES 12 | python | 2.7.9-16.7.1 | SUSE-SU-2019:0223-1 |
| SLES 12 | python-doc +1 | 2.7.9-16.7.2 | SUSE-SU-2019:0223-1 |
| SLES 12 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
| SLES 11 SP4 | MozillaFirefox | 68.2.0-78.51.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | MozillaFirefox-branding-SLED | 68-21.9.8 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-atk | 2.26.1-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-cairo | 1.15.10-2.13.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gdk-pixbuf | 2.36.11-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-glib2 | 2.54.3-2.14.7 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gtk3 | 3.10.9-2.15.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-harfbuzz | 1.7.5-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi | 3.2.1.git259-2.3.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi-gcc5 | 5.3.1+r233831-14.1 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-pango | 1.40.14-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nspr | 4.21-29.6.1 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nss | 3.45-38.9.3 | SUSE-SU-2019:14246-1 |
| SLES 2 | python | 2.7.17-7.32.2 | SUSE-SU-2020:0234-1 |
| SLES 2 | python-base | 2.7.17-7.32.1 | SUSE-SU-2020:0234-1 |
| SLES for SAP 15 | python3 +1 | 3.6.12-3.67.2 | SUSE-SU-2020:3930-1 |
| SLES for SAP 12 SP5 | python36 +1 | 3.6.10-4.3.5 | SUSE-SU-2020:3563-1, SUSE-SU-2020:0302-1 |
| SLES for SAP 12 SP5 | python36-core | 3.6.12-4.22.2 | SUSE-SU-2020:3563-1 |
| SLES for SAP 12 SP4 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SLES for SAP 12 SP4 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
| SLES for SAP 12 SP3 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SLES for SAP 12 SP3 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
| SLES for SAP 12 SP2 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SLES for SAP 12 SP2 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
| SLES for SAP 12 SP1 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-2 |
| SLES for SAP 12 SP1 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-2 |
| SLE HPC 15 | python3 +1 | 3.6.12-3.67.2 | SUSE-SU-2020:3930-1 |
| SUSE OpenStack Cloud 7 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SUSE OpenStack Cloud 7 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
| SUSE Enterprise Storage 5 | python | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SUSE Enterprise Storage 4 | python +2 | 2.7.13-28.21.1 | SUSE-SU-2019:0482-1 |
| SUSE Enterprise Storage 4 | python3 +1 | 3.4.6-25.21.1 | SUSE-SU-2019:0243-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python | 2.7.18-8.1 | openSUSE-SU-2024:11202-1 |
| openSUSE Tumbleweed | python310 | 3.10.0rc1-4.2 | openSUSE-SU-2024:11283-1 |
| openSUSE Tumbleweed | python311 | 3.11.0b1-1.1 | openSUSE-SU-2024:12089-1 |
| openSUSE Tumbleweed | python312 | 3.12.0a7-1.1 | openSUSE-SU-2024:12910-1 |
| openSUSE Tumbleweed | python313 | 3.13.0~b3-1.1 | openSUSE-SU-2024:14109-1 |
| openSUSE Tumbleweed | python314 | 3.14.0~a1-1.1 | openSUSE-SU-2024:14434-1 |
| openSUSE Tumbleweed | python315 | 3.15.0~a1-1.1 | openSUSE-SU-2025:15713-1 |
| openSUSE Tumbleweed | python36 | 3.6.15-1.1 | openSUSE-SU-2024:11284-1 |
| openSUSE Tumbleweed | python38 | 3.8.12-1.2 | openSUSE-SU-2024:11285-1 |
| openSUSE Tumbleweed | python39 | 3.9.7-2.1 | openSUSE-SU-2024:11286-1 |
| openSUSE Leap 15.2 | python3 +2 | 3.6.12-lp152.4.14.1 | openSUSE-SU-2020:2332-1 |
| openSUSE Leap 15.1 | python3 +1 | 3.6.10-lp151.6.7.1 | openSUSE-SU-2020:2333-1, openSUSE-SU-2020:0086-1 |
| openSUSE Leap 15.1 | python3-core +1 | 3.6.12-lp151.6.32.1 | openSUSE-SU-2020:2333-1 |
| openSUSE Leap 15.0 | python +1 | 2.7.14-lp150.6.6.1 | openSUSE-SU-2019:0184-1 |
| openSUSE Leap 15.0 | python3 +1 | 3.6.5-lp150.2.6.1 | openSUSE-SU-2019:0155-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.23 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.22 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.21 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.20 | python3 +1 | 3.6.8-r1 | — |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.18 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.17 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.16 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.15 | python2 | 2.7.15-r3 | — |
| Alpine v3.15 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.14 | python2 | 2.7.15-r3 | — |
| Alpine v3.14 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.13 | python2 | 2.7.15-r3 | — |
| Alpine v3.13 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.12 | python2 | 2.7.15-r3 | — |
| Alpine v3.12 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.11 | python2 +1 | 2.7.15-r3 | — |
| Alpine v3.11 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.10 | python2 +1 | 2.7.15-r3 | — |
| Alpine v3.10 | python3 +1 | 3.6.8-r1 | — |
| Alpine v3.9 | python2 +1 | 2.7.15-r3 | — |
| Alpine v3.9 | python3 +1 | 3.6.8-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | python +6 | 2.7.16-1.amzn2.0.1 | ALAS2-2019-1230 |
| Amazon Linux 2 | python3 +6 | 3.7.2-4.amzn2.0.1 | ALAS2-2019-1169 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | python3-idle +6 | 3.6.8-15.1.0.1.el8 | ELSA-2019-3520 |
| Oracle Linux 7 | python +6 | 2.7.5-86.0.1.el7 | ELSA-2019-2030 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
JonathanWilbur/CVE-2019-5010 ★ 0 · Nov 6, 2019
CVE-2019-5010 Exploit PoC - Python Denial of Service via Malformed X.509v3 Extension
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 44
- RHSA-2019:3725 Red Hat Security Advisory: rh-python36-python security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- USN-4127-1 python2.7, python3.5, python3.6, python3.7 vulnerabilities Ubuntu Security Notices (USN) · Oct 8, 2026
- USN-6891-1 python3.5, python3.6, python3.7, python3.8, python3.9, python3.10, python3.11, python3.12 vulnerabilities Ubuntu Security Notices (USN) · Oct 8, 2026
- USN-4127-2 python2.7, python3.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 8, 2026
- RHSA-2019:3520 Red Hat Security Advisory: python3 security and bug fix update Red Hat Security Advisories (RHSA) · Oct 8, 2026
- RHSA-2019:2030 Red Hat Security Advisory: python security and bug fix update Red Hat Security Advisories (RHSA) · Oct 8, 2026
- openSUSE-SU-2025:15713-1 python315-3.15.0~a1-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-1834-1 python2.7 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1663-1 python3.4 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2337-1 python2.7 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2280-1 python3.5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:0302-1 Security update for python36 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11285-1 python38-3.8.12-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0215-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3563-1 Security update for python36 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14434-1 python314-3.14.0~a1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0086-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2332-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0482-2 Security update for python SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0243-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0223-1 Security update for python SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11286-1 python39-3.9.7-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0271-1 Security update for python SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12910-1 python312-3.12.0a7-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11283-1 python310-3.10.0rc1-4.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12089-1 python311-3.11.0b1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:0184-1 Security update for python SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0243-2 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14109-1 python313-3.13.0~b3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0114-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2333-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:0155-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3930-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14246-1 Security update for Mozilla Firefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11284-1 python36-3.6.15-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1601 Python: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 9, 2025
- openSUSE-SU-2024:11202-1 python-2.7.18-8.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2019:0482-1 Security update for python SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2020:0234-1 Security update for python SUSE / openSUSE Security Updates · May 2, 2025
- NCSC-2025-0041 Kwetsbaarheden verholpen in F5 BIG-IP NCSC-NL (Netherlands) · Feb 11, 2025
- ELSA-2019-3520 Moderate: python3 security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 14, 2019
- ELSA-2019-2030 Moderate: python security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 13, 2019
- ALAS2-2019-1230 Important: python security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 1, 2019
- ALAS2-2019-1169 Moderate: python3 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 8, 2019
References
- RHSA-2019:3520 vendor-advisory
- RHSA-2019:3725 vendor-advisory
- openSUSE-SU-2020:0086 vendor-advisory
- GLSA-202003-26 vendor-advisory
- [debian-lts-announce] 20200715 [SECURITY] [DLA 2280-1] python3.5 security update mailing-list
- [bookkeeper-issues] 20200729 [GitHub] [bookkeeper] padma81 opened a new issue #2387: Security vulnerabilities in the apache/bookkeeper-4.9.2 image mailing-list
- [debian-lts-announce] 20200822 [SECURITY] [DLA 2337-1] python2.7 security update mailing-list
- https://talosintelligence.com/vulnerability_reports/TALOS-2019-0758