CVE-2026-18924
criticalA 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 i…
Vendor / product: Haxx — curl
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.
CVSS
9.1
9.1 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Severity source: NVD CVSS v3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
Timeline (UTC)
Published: 2026-09-06 18:17
Modified: 2026-09-15 07:16
NVD status: Modified
Last synced 1 day ago
Verified against the source API 2026-10-27 06:50 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
haxx / curl ≥7.44.0 <8.22.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://curl.se/docs/CVE-2026-18924.html
Vendor advisory: https://curl.se/docs/CVE-2026-18924.json
Patch / mitigation: https://curl.se/docs/CVE-2026-18924.html
Patch / mitigation: https://hackerone.com/reports/3916059
Patch / mitigation: https://hackerone.com/reports/3916059
References
- https://curl.se/docs/CVE-2026-18924.html 2499f714-1537-4658-8207-48ae4bb9eae9
- https://curl.se/docs/CVE-2026-18924.json 2499f714-1537-4658-8207-48ae4bb9eae9
- https://hackerone.com/reports/3916059 2499f714-1537-4658-8207-48ae4bb9eae9
- https://hackerone.com/reports/3916059 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:50 UTC · record ↗