CVE-2026-18924

HTTP/2 server push UAF

CRITICAL 9.1

At a glance

Source: NVD
EPSS: EPSS 0.58 % · percentile 48 (2026-10-28)
State: PUBLISHED
Published: 2026-09-06 17:47 UTC
Updated: 2026-09-15 06:02 UTC
Assigner: curl
NVD status: Modified

Description

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.

Weaknesses (CWE)

CWE-416 — Use After Free

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	CRITICAL 9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H	CISA-ADP
CVSS 3.1	CRITICAL 9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

European references

ENISA EUVD · EUVD-2026-72165
GCVE · GCVE-0-2026-18924

CERT-FR advisories

CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2026-AVI-1351 — Multiples vulnérabilités dans Oracle MySQL · cert.ssi.gouv.fr
CERTFR-2026-AVI-1336 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2026-AVI-1108 — Multiples vulnérabilités dans Curl · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* ≥ 7.44.0 < 8.22.0

Affected products

Product	Versions
curl · curl	affected 7.44.0 < 8.14.2 ; affected 8.15.0 < 8.16.1 ; affected 8.17.0 < 8.20.1 ; affected 8.21.0 < 8.22.0
curl · curl	affected ea7134ac874a66107e54ff93657ac565cf2ec4aa < 90325ff0444cbdff368bda5d26d6405a0bb6ee43
curl · curl	affected 8.21.0 ; affected 8.20.0 ; affected 8.19.0 ; affected 8.18.0 ; affected 8.17.0 ; affected 8.16.0

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD