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Vulnerabilities

Vulnerability · CVE-2026-19445

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 wa

Published Sep 30, 2026 · catalog updated Oct 28, 2026 · BSI

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-19445. EPSS is 0.52%. Act only if a listed version of BSI is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.52%
Remediation
Advisory link
Affected products
Debian:12 pypy3 · Debian:12 python3.11 · Debian:13 pypy3 · Debian:13 python3.13 · Debian:14 pypy3 · Debian:14 python3.13

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 pypy37.3.11+dfsg-2, 7.3.11+dfsg-2+deb12u1, 7.3.11+dfsg-2+deb12u2
  • Debian:12 python3.110 → 3.11.2-6+deb12u9
  • Debian:13 pypy37.3.19+dfsg-2, 7.3.20+dfsg-1, 7.3.20+dfsg-2
  • Debian:13 python3.133.13.11-1, 3.13.12-1, 3.13.14-1
  • Debian:14 pypy30 → 8.0.1+dfsg-1
  • Debian:14 python3.133.13.11-1, 3.13.12-1, 3.13.14-1
  • Debian:14 python3.140 → 3.14.8-1
  • Debian:14 python3.150 → 3.15.0~rc3-1

How to fix CVE-2026-19445

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-19445. EPSS is 0.52%. Act only if a listed version of BSI is installed.

Which versions are affected?

Compare what you have installed with 7.3.11+dfsg-2, 7.3.11+dfsg-2+deb12u1, 7.3.11+dfsg-2+deb12u2, 0 → 3.11.2-6+deb12u9, 7.3.19+dfsg-2, 7.3.20+dfsg-1, 7.3.20+dfsg-2, 3.13.11-1, 3.13.12-1, 3.13.14-1, 0 → 8.0.1+dfsg-1, 0 → 3.14.8-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.52%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 26, 2026 · BSI CERT-Bund

    Detected

    CVE-2026-19445 is listed by CPython: Mehrere Schwachstellen.

  2. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    pypy3 fixed in 8.0.1+dfsg-1; python3.11 fixed in 3.11.2-6+deb12u9; python3.14 fixed in 3.14.8-1; python3.15 fixed in 3.15.0~rc3-1

  3. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    pypy3 fixed in 8.0.1+dfsg-1

  4. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    python3.11 fixed in 3.11.2-6+deb12u9

  5. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    python3.14 fixed in 3.14.8-1

  6. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    python3.15 fixed in 3.15.0~rc3-1

  7. Oct 28, 2026 · Trivy Vulnerability DB

    Updated

    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 th

Sources

  • BSI CERT-BundGovernment advisoryCVE-2026-19445

    CPython: Mehrere Schwachstellen

    wid.cert-bund.de
  • CVE.orgVulnerability recordCVE-2026-19445

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-19445

    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.

    osv.dev

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Trivy Vulnerability DBOct 28, 2026
  • BSI CERT-BundOct 27, 2026
  • CVE.orgOct 26, 2026