CVE-2026-8932

incomplete mTLS config matching in conn reuse

HIGH

7.5

CVSS Score

Published: July 3, 2026 at 06:16 AM UTC

Updated: September 15, 2026 at 07:35 AM UTC

1 product affected across 1 vendorCurl

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Severity

HIGH7.5

Exploit prediction

EPSS 0.4%

SSVC

PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Curl · Haxx

95%

7.7 ≤ v < 8.21.07.7.0 ≤ v < 8.14.28.15.0 ≤ v < 8.16.18.17.0 ≤ v < 8.20.17.10 7.10.1 7.10.2 7.10.3 7.10.4 7.10.5 7.10.6 7.10.7 7.10.8 7.11.0 7.11.1 7.11.2 7.12.0 7.12.1 7.12.2 7.12.3 7.13.0 7.13.1 7.13.2 7.14.0 7.14.1 7.15.0 7.15.1 7.15.2 7.15.3 7.15.4 7.15.5 7.16.0 7.16.1 7.16.2 7.16.3 7.16.4 7.17.0 7.17.1 7.18.0 7.18.1 7.18.2 7.19.0 7.19.1 7.19.2 7.19.3 7.19.4 7.19.5 7.19.6 7.19.7 7.20.0 7.20.1 7.21.0 7.21.1 7.21.2 7.21.3 7.21.4 7.21.5 7.21.6 7.21.7 7.22.0 7.23.0 7.23.1 7.24.0 7.25.0 7.26.0 7.27.0 7.28.0 7.28.1 7.29.0 7.30.0 7.31.0 7.32.0 7.33.0 7.34.0 7.35.0 7.36.0 7.37.0 7.37.1 7.38.0 7.39.0 7.40.0 7.41.0 7.42.0 7.42.1 7.43.0 7.44.0 7.45.0 7.46.0 7.47.0 7.47.1 7.48.0 7.49.0 7.49.1 7.50.0 7.50.1 7.50.2 7.50.3 7.51.0 7.52.0 7.52.1 7.53.0 7.53.1 7.54.0 7.54.1 7.55.0 7.55.1 7.56.0 7.56.1 7.57.0 7.58.0 7.59.0 7.60.0 7.61.0 7.61.1 7.62.0 7.63.0 7.64.0 7.64.1 7.65.0 7.65.1 7.65.2 7.65.3 7.66.0 7.67.0 7.68.0 7.69.0 7.69.1 7.7 7.7.0 7.7.1 7.7.2 7.7.3 7.70.0 7.71.0 7.71.1 7.72.0 7.73.0 7.74.0 7.75.0 7.76.0 7.76.1 7.77.0 7.78.0 7.79.0 7.79.1 7.8 7.8.1 7.80.0 7.81.0 7.82.0 7.83.0 7.83.1 7.84.0 7.85.0 7.86.0 7.87.0 7.88.0 7.88.1 7.9 7.9.1 7.9.2 7.9.3 7.9.4 7.9.5 7.9.6 7.9.7 7.9.8 8.0.0 8.0.1 8.1.0 8.1.1 8.1.2 8.10.0 8.10.1 8.11.0 8.11.1 8.12.0 8.12.1 8.13.0 8.14.0 8.14.1 8.15.0 8.16.0 8.17.0 8.18.0 8.19.0 8.2.0 8.2.1 8.20.0 8.3.0 8.4.0 8.5.0 8.6.0 8.7.0 8.7.1 8.8.0 8.9.0 8.9.1a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4

Vendor states this is fixed in 7541ae569d82fb308a5e2d94916027da4fa3ba3e (fixed)

Affected range stops below 8.14.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.16.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.20.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.21.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor Advisory

Source: cverecord

https://curl.se/docs/CVE-2026-8932.json

PatchVendor Advisory

Source: cverecord

https://curl.se/docs/CVE-2026-8932.html

ExploitIssue TrackingThird Party Advisory

Source: cverecord

https://hackerone.com/reports/3733910

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

NVD-CWE-OtherCWE-305

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