# CVE-2026-80229 — curl

> As of 2026-09-06, CVE-2026-80229 is a vulnerability in curl, EPSS 0.2% (11.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-80229 as of 2026-09-06; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-06

## What is CVE-2026-80229?

When performing transfers via libcurl’s multi interface, pooled TLS connections can outlive their originating easy handles. In OpenSSL 3 provider configurations, libcurl attaches an allocated library context to the easy handle's state and passes it to OpenSSL without acquiring an ownership reference; destroying the easy handle prematurely frees this context while the active connection retains a dangling pointer, leading to a heap-use-after-free upon subsequent I/O or post-handshake operations.

1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 29 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 11.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 0.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-06

## Is CVE-2026-80229 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **curl**: curl

## How to fix CVE-2026-80229

No vendor patch reference has been recorded for CVE-2026-80229 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-80229

No threat campaign in the Threadlinqs corpus currently references CVE-2026-80229, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-09-07. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [curl.se](https://curl.se/docs/CVE-2026-80229.json)
- [curl.se (CVE 2026 80229)](https://curl.se/docs/CVE-2026-80229.html)
- [hackerone.com](https://hackerone.com/reports/3969255)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-80229
Full detection coverage and IOCs for threats exploiting CVE-2026-80229 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp