Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2019-5010

CVE-2019-5010HIGH

n/a Python — An exploitable denial-of-service vulnerability exists in the X509 certificate parser of Python.org Python 2.7.11 / 3.6.6.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .2074   97.5     —

AFFECTED
  Product  Versions                                                                                                                                               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 –  —

TIMELINE
  Jan 4   Reserved by talos
  Oct 31  Published (CNA: talos)
  Oct 7   EXPLOIT PUBLISHED — CVE-2019-5010 (Python). Public exploit reference added.
  Oct 7   RESCORED — CVE-2019-5010 (Python). CVSS 5.9 → 7.5 (NVD).

CWE-476 · CNA: talos · CVSS v3.1 · 8 references · NVD status: Modified

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
January 4, 2019	Reserved	Reserved by talos
October 31, 2019	Published	Published (CNA: talos)
October 7, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2019-5010 (Python). Public exploit reference added.
October 7, 2026	RESCORED	RESCORED — CVE-2019-5010 (Python). CVSS 5.9 → 7.5 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	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	—

Weaknesses

CWE-476

References (8)

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html [Mailing List, Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:3520 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:3725 [Third Party Advisory]
https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html [Mailing List, Third Party Advisory]
https://security.gentoo.org/glsa/202003-26 [Third Party Advisory]
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0758 [Exploit, Third Party Advisory]

Authoritative record: CVE-2019-5010 at cve.org

Weaknesses: CWE-476

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2019-5010 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Thursday, October 8, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.