Vulnerability in Curl
CVE-2026-8932
libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, some TLS settings related to client certificates were left out from the configuration match checks, making them match too easily. In particular options related to the private key.
EPSS: 0.004 (32.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
Public proof-of-concept exploits
References
- 2499f714-1537-4658-8207-48ae4bb9eae9 (Vendor Advisory)
- 2499f714-1537-4658-8207-48ae4bb9eae9 (Patch, Vendor Advisory)
- 2499f714-1537-4658-8207-48ae4bb9eae9 (Exploit, Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2026-8932?
- CVE-2026-8932 is a high-severity vulnerability in Curl, classified under CWE-305 AUTHENTICATION BYPASS BY PRIMARY WEAKNESS. CVSS score: 7.5/10. Published 2026-07-03.
- How severe is CVE-2026-8932?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2026-8932 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.