Native CA trust persist

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-11564
StatePUBLISHED
Assignercurl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-03 07:16:23 UTC
Updated2026-09-15 07:16:25 UTC
Descriptionlibcurl 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.003630000 probability, percentile 0.298070000 (date 2026-09-15)

Problem Types: CWE-295 | CWE-295 Improper Certificate Validation

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Haxx Curl All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Curl Curl affected 8.17.0 8.20.1 semver Not specified
CNA Curl Curl affected eefd03c572996e5de4dec4fe295ad6f103e0eefc d69bfad3fa3daf5e72331f6870667607828d5891 git Not specified
CNA Curl Curl affected 8.20.0 Not specified
CNA Curl Curl affected 8.19.0 Not specified
CNA Curl Curl affected 8.18.0 Not specified
CNA Curl Curl affected 8.17.0 Not specified

References

ReferenceSourceLinkTags
curl.se/docs/CVE-2026-11564.json 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se Vendor Advisory
hackerone.com/reports/3788984 134c704f-9b21-4f2e-91b3-4a467353bcc0 hackerone.com Exploit, Issue Tracking, Third Party Advisory
curl.se/docs/CVE-2026-11564.html 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se Patch, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Filipe Casal of Trail of Bits in collaboration with OpenAI (en)

CNA: Stefan Eissing (en)

© CVE.report 2026

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