CVE-2026-80231

native CA store conn reuse

HIGH

7.5

CVSS Score

Published: September 6, 2026 at 05:48 PM 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 0.9%

SSVC

PoC

Description

A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup for a given hostname even when using a different Native CA Store setting (`CURLSSLOPT_NATIVE_CA`) than when the connection was created.

Affected

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

Curl · Haxx

95%

7.71.0 ≤ v < 8.14.27.71.0 ≤ v < 8.22.08.15.0 ≤ v < 8.16.18.17.0 ≤ v < 8.20.18.21.0 ≤ v < 8.22.0148534db57dda611cf8516e92e4d6e35fc1e50747.71.0 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 7.80.0 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 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 8.21.0 8.3.0 8.4.0 8.5.0 8.6.0 8.7.0 8.7.1 8.8.0 8.9.0 8.9.1

Vendor states this is fixed in 7be1e70cb6bcd83e130ecfe8cb91b6a7dcdeff42 (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 8.22.0, 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-2026-80231.json

MitigationPatchVendor Advisory

Source: cverecord

https://curl.se/docs/CVE-2026-80231.html

ExploitMitigationThird Party Advisory

Source: cverecord

https://hackerone.com/reports/3969368

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: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-488

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