VulnerabilityAnalyzed
CVE-2026-11564
libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup.
CRITICAL 9.1EPSS 0.36%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.36% probability · 30th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-295
- Affected
- haxx/curl
- Source
- 2499f714-1537-4658-8207-48ae4bb9eae9
References
- https://curl.se/docs/CVE-2026-11564.htmlPatch, Vendor Advisory
- https://curl.se/docs/CVE-2026-11564.jsonVendor Advisory
- https://hackerone.com/reports/3788984Exploit, Issue Tracking, Third Party Advisory
- https://hackerone.com/reports/3788984Exploit, Issue Tracking, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.