CVE-2026-11564

Aliases:DEBIAN-CVE-2026-11564ALPINE-CVE-2026-11564CGA-27mh-w5xc-g5x5CGA-43fj-f52g-532gCGA-4p3g-7xxm-j8vgCGA-53qr-vxhq-w9f5CGA-5hmp-v8h6-mv4xCGA-7923-35pp-4p8vCGA-7m93-hg72-c8mmCGA-8v6r-5c7w-xg4gCGA-968w-4mqc-2j3hCGA-986w-5mxp-gpxgCGA-c3j5-r4qc-hjr5CGA-f8mg-9232-m7h6CGA-fq8f-8w74-hcwwCGA-gmcw-v429-8pchCGA-mjjw-p94h-63g4CGA-mqhx-9mh2-w2cqCGA-q75g-pq89-mgv8CGA-qcr7-778g-h26vCGA-vgx8-2gpp-4rx9CGA-xc97-r747-5px7
Advisory lineage Upstream: 0 Downstream: 7
Modified
Published: 03 Jul 2026, 06:12
Last modified:15 Sept 2026, 06:02

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.1 CRITICAL
v3.1 (cve.org)
EPSS Score
0.36% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

03 Jul 2026, 06:12
Published
Vulnerability first disclosed
15 Sept 2026, 06:02
Last Modified
Vulnerability information updated

Description

libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer.

CVSS Metrics

  • v3.1•CRITICAL•Score: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Trends

Current EPSS score: 0.36%• Percentile: 30%

Techniques & Countermeasures

  • CWE-295•Improper Certificate Validation

    The product does not validate, or incorrectly validates, a certificate.

Affected Systems

  • alpine•curl

    ≥ 8.17.0, < 8.22.0-r0 | ≥ 8.17.0, < 8.21.0-r0

  • chainguard•eco-python-curl

    < 8.21.0-r0

  • chainguard•eco-python-curl-minimal

    < 8.21.0-r0

  • chainguard•eco-python-curl-minimal-bin

    < 8.21.0-r0

  • chainguard•eco-python-curl-minimal-dev

    < 8.21.0-r0

  • chainguard•eco-python-curl-minimal-doc

    < 8.21.0-r0

  • chainguard•eco-python-curl-minimal-static

    < 8.21.0-r0

  • chainguard•eco-python-curl-nghttp2

    < 8.21.0-r0

  • chainguard•eco-python-curl-nghttp2-bin

    < 8.21.0-r0

  • chainguard•eco-python-curl-nghttp2-dev

    < 8.21.0-r0

  • chainguard•eco-python-curl-nghttp2-static

    < 8.21.0-r0

  • curl•curl

    8.20.0 | 8.19.0 | 8.18.0 | 8.17.0 | ≥ 8.17.0, < 8.20.1 | ≥ eefd03c572996e5de4dec4fe295ad6f103e0eefc, < d69bfad3fa3daf5e72331f6870667607828d5891 | 8.20.0 | 8.19.0 | 8.18.0 | 8.17.0

  • debian•curl

    < 8.21.0~rc2-1

  • haxx•curl

    ≥ 8.17.0, < 8.21.0

References (7)