CVE catalog

CVE-2026-19445

Severity: Critical · CVSS 9.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Sep 30, 2026, 4:16:04 PM UTC
Updated: Sep 30, 2026, 5:16:45 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.43% · Oct 22, 2026

A remote, unauthenticated TLS client can make a server crash or call through a freed pointer if its sni_callback assigns a different context to SSLSocket.context (the documented way to select a certificate per server name) and nothing else keeps the original ssl.SSLContext alive. Typical cases are servers that create an SSLContext per connection or replace it while connections are open; servers that wrap their listening socket with it are not affected. Mitigation: keep a reference to every SSLContext that sets sni_callback for the lifetime of the server. TLS clients are not affected.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	pypy3	sid	`8.0.1+dfsg-1`	vulnerable
Debian	pypy3	forky	`8.0.1+dfsg-1`	vulnerable
Debian	pypy3	trixie	`7.3.19+dfsg-2`	vulnerable
Debian	pypy3	bookworm	`7.3.11+dfsg-2+deb12u3`	vulnerable
Debian	python3.11	bookworm	`3.11.2-6+deb12u8`	vulnerable
Debian	python3.11	bookworm-security	`3.11.2-6+deb12u9`	fixed
Opensuse	python315	tumbleweed	`3.15.0~rc3-1.1`	fixed
Alpine	python3	3.21	`3.12.15-r0`	fixed
Alpine	python3	3.22	`3.12.15-r0`	fixed
Alpine	python3	3.23	`3.12.15-r0`	fixed
Alpine	python3	3.24	`3.14.8-r0`	fixed
Fedora	python3.15	43	`0:3.15.0-1.fc43`	fixed
Fedora	python3.15	44	`0:3.15.0-1.fc44`	fixed
Fedora	python3.14	43	`0:3.14.8-1.fc43`	fixed
Fedora	python3-docs	43	`0:3.14.8-1.fc43`	fixed
Fedora	python3.10	44	`0:3.10.22-1.fc44`	fixed
Fedora	python3.13	43	`0:3.13.16-1.fc43`	fixed
Fedora	python3.13	44	`0:3.13.16-1.fc44`	fixed
Fedora	python3.10	43	`0:3.10.22-1.fc43`	fixed
Fedora	python3.11	43	`0:3.11.17-1.fc43`	fixed
Fedora	python3.11	44	`0:3.11.17-1.fc44`	fixed
Fedora	python3.12	43	`0:3.12.15-1.fc43`	fixed
Fedora	python3.14	44	`0:3.14.8-1.fc44`	fixed
Fedora	python3-docs	44	`0:3.14.8-1.fc44`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	pypy3	source	sid	`(unfixed)`	not yet assigned	Not reported	[1150805]
Debian	pypy3	source	forky	`(unfixed)`	not yet assigned	Not reported	[1150805]
Debian	pypy3	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1150805]
Debian	pypy3	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1150805]
Debian	python3.11	source	bookworm	`3.11.2-6+deb12u9`	not yet assigned	Not reported	Not reported
Opensuse	python315	rpm	tumbleweed	`3.15.0~rc3-1.1`	Not reported	OPENSUSE-SU-2026:12069-1	Not reported
Alpine	python3	apk	3.21	`3.12.15-r0`	Not reported	ALPINE-CVE-2026-19445	Not reported
Alpine	python3	apk	3.22	`3.12.15-r0`	Not reported	ALPINE-CVE-2026-19445	Not reported
Alpine	python3	apk	3.23	`3.12.15-r0`	Not reported	ALPINE-CVE-2026-19445	Not reported
Alpine	python3	apk	3.24	`3.14.8-r0`	Not reported	ALPINE-CVE-2026-19445	Not reported
Fedora	python3.15	rpm	43	`0:3.15.0-1.fc43`	Not reported	FEDORA-2026-F86849B3F6#CVE-2026-19445	Not reported
Fedora	python3.15	rpm	44	`0:3.15.0-1.fc44`	Not reported	FEDORA-2026-1419522981#CVE-2026-19445	Not reported
Fedora	python3.14	rpm	43	`0:3.14.8-1.fc43`	Not reported	FEDORA-2026-A3DA6BB5CD#CVE-2026-19445	Not reported
Fedora	python3-docs	rpm	43	`0:3.14.8-1.fc43`	Not reported	FEDORA-2026-A3DA6BB5CD#CVE-2026-19445	Not reported
Fedora	python3.10	rpm	44	`0:3.10.22-1.fc44`	Not reported	FEDORA-2026-9A19C3DFB2#CVE-2026-19445	Not reported
Fedora	python3.13	rpm	43	`0:3.13.16-1.fc43`	Not reported	FEDORA-2026-1928C5D40B#CVE-2026-19445	Not reported
Fedora	python3.13	rpm	44	`0:3.13.16-1.fc44`	Not reported	FEDORA-2026-67C5F750B3#CVE-2026-19445	Not reported
Fedora	python3.10	rpm	43	`0:3.10.22-1.fc43`	Not reported	FEDORA-2026-AB6004EC50#CVE-2026-19445	Not reported
Fedora	python3.11	rpm	43	`0:3.11.17-1.fc43`	Not reported	FEDORA-2026-37C784FC16#CVE-2026-19445	Not reported
Fedora	python3.11	rpm	44	`0:3.11.17-1.fc44`	Not reported	FEDORA-2026-F105922543#CVE-2026-19445	Not reported
Fedora	python3.12	rpm	43	`0:3.12.15-1.fc43`	Not reported	FEDORA-2026-F30CB310F9#CVE-2026-19445	Not reported
Fedora	python3.14	rpm	44	`0:3.14.8-1.fc44`	Not reported	FEDORA-2026-6261B26F4E#CVE-2026-19445	Not reported
Fedora	python3-docs	rpm	44	`0:3.14.8-1.fc44`	Not reported	FEDORA-2026-6261B26F4E#CVE-2026-19445	Not reported

[Debian bug #1150805]

Notes

[trixie] pypy3: Minor issue [bookworm] pypy3: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[idle-python3.11]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · all · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[libpython3.11]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[libpython3.11-dbg]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[libpython3.11-dev]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[libpython3.11-minimal]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[libpython3.11-stdlib]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[libpython3.11-testsuite]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · all · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[pypy3]Affected
Details (2)
- 7.3.11+dfsg-2+deb12u3 · amd64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
- 7.3.11+dfsg-2+deb12u3 · arm64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
[pypy3-dev]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
[pypy3-doc]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
[pypy3-lib]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · amd64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
- 7.3.11+dfsg-2+deb12u3 · arm64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
[pypy3-lib-testsuite]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
[pypy3-tk]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · amd64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
- 7.3.11+dfsg-2+deb12u3 · arm64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
[pypy3-venv]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm; nvd · pypy3 · debian · 12
[python3.11]Affected
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[python3.11-dbg]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[python3.11-dev]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[python3.11-doc]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · all · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[python3.11-examples]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · all · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
[python3.11-full]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected · Fixed: 3.11.2-6+deb12u9
  nvd · python3.11 · debian · bookworm; nvd · python3.11 · debian · 12

Next results

Observed: Oct 23, 2026, 8:14:22 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [Fedora security updates (Bodhi)] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]