CVE-2026-18924
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Summary
A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| curl | curl | 7.44.0 < 8.14.2 | affected |
| curl | curl | 8.15.0 < 8.16.1 | affected |
| curl | curl | 8.17.0 < 8.20.1 | affected |
| curl | curl | 8.21.0 < 8.22.0 | affected |
| curl | curl | ea7134ac874a66107e54ff93657ac565cf2ec4aa < 90325ff0444cbdff368bda5d26d6405a0bb6ee43 | affected |
| curl | curl | 8.21.0 | affected |
| curl | curl | 8.20.0 | affected |
| curl | curl | 8.19.0 | affected |
| curl | curl | 8.18.0 | affected |
| curl | curl | 8.17.0 | affected |
| curl | curl | 8.16.0 | affected |
| curl | curl | 8.15.0 | affected |
| curl | curl | 8.14.1 | affected |
| curl | curl | 8.14.0 | affected |
| curl | curl | 8.13.0 | affected |
| curl | curl | 8.12.1 | affected |
| curl | curl | 8.12.0 | affected |
| curl | curl | 8.11.1 | affected |
| curl | curl | 8.11.0 | affected |
| curl | curl | 8.10.1 | affected |
| curl | curl | 8.10.0 | affected |
| curl | curl | 8.9.1 | affected |
| curl | curl | 8.9.0 | affected |
| curl | curl | 8.8.0 | affected |
| curl | curl | 8.7.1 | affected |
| curl | curl | 8.7.0 | affected |
| curl | curl | 8.6.0 | affected |
| curl | curl | 8.5.0 | affected |
| curl | curl | 8.4.0 | affected |
| curl | curl | 8.3.0 | affected |
| curl | curl | 8.2.1 | affected |
| curl | curl | 8.2.0 | affected |
| curl | curl | 8.1.2 | affected |
| curl | curl | 8.1.1 | affected |
| curl | curl | 8.1.0 | affected |
| curl | curl | 8.0.1 | affected |
| curl | curl | 8.0.0 | affected |
| curl | curl | 7.88.1 | affected |
| curl | curl | 7.88.0 | affected |
| curl | curl | 7.87.0 | affected |
| curl | curl | 7.86.0 | affected |
| curl | curl | 7.85.0 | affected |
| curl | curl | 7.84.0 | affected |
| curl | curl | 7.83.1 | affected |
| curl | curl | 7.83.0 | affected |
| curl | curl | 7.82.0 | affected |
| curl | curl | 7.81.0 | affected |
| curl | curl | 7.80.0 | affected |
| curl | curl | 7.79.1 | affected |
| curl | curl | 7.79.0 | affected |
| curl | curl | 7.78.0 | affected |
| curl | curl | 7.77.0 | affected |
| curl | curl | 7.76.1 | affected |
| curl | curl | 7.76.0 | affected |
| curl | curl | 7.75.0 | affected |
| curl | curl | 7.74.0 | affected |
| curl | curl | 7.73.0 | affected |
| curl | curl | 7.72.0 | affected |
| curl | curl | 7.71.1 | affected |
| curl | curl | 7.71.0 | affected |
| curl | curl | 7.70.0 | affected |
| curl | curl | 7.69.1 | affected |
| curl | curl | 7.69.0 | affected |
| curl | curl | 7.68.0 | affected |
| curl | curl | 7.67.0 | affected |
| curl | curl | 7.66.0 | affected |
| curl | curl | 7.65.3 | affected |
| curl | curl | 7.65.2 | affected |
| curl | curl | 7.65.1 | affected |
| curl | curl | 7.65.0 | affected |
| curl | curl | 7.64.1 | affected |
| curl | curl | 7.64.0 | affected |
| curl | curl | 7.63.0 | affected |
| curl | curl | 7.62.0 | affected |
| curl | curl | 7.61.1 | affected |
| curl | curl | 7.61.0 | affected |
| curl | curl | 7.60.0 | affected |
| curl | curl | 7.59.0 | affected |
| curl | curl | 7.58.0 | affected |
| curl | curl | 7.57.0 | affected |
| curl | curl | 7.56.1 | affected |
| curl | curl | 7.56.0 | affected |
| curl | curl | 7.55.1 | affected |
| curl | curl | 7.55.0 | affected |
| curl | curl | 7.54.1 | affected |
| curl | curl | 7.54.0 | affected |
| curl | curl | 7.53.1 | affected |
| curl | curl | 7.53.0 | affected |
| curl | curl | 7.52.1 | affected |
| curl | curl | 7.52.0 | affected |
| curl | curl | 7.51.0 | affected |
| curl | curl | 7.50.3 | affected |
| curl | curl | 7.50.2 | affected |
| curl | curl | 7.50.1 | affected |
| curl | curl | 7.50.0 | affected |
| curl | curl | 7.49.1 | affected |
| curl | curl | 7.49.0 | affected |
| curl | curl | 7.48.0 | affected |
| curl | curl | 7.47.1 | affected |
| curl | curl | 7.47.0 | affected |
| curl | curl | 7.46.0 | affected |
| curl | curl | 7.45.0 | affected |
| curl | curl | 7.44.0 | affected |
Weaknesses
- CWE-416: Use After Free
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
Additional References
References
- https://curl.se/docs/CVE-2026-18924.json
- https://curl.se/docs/CVE-2026-18924.html
- https://hackerone.com/reports/3916059
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