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CVE-2026-18924

HTTP/2 server push UAF

Critical9.1EPSS 0.58%
Published
Updated
Reserved
Assigned by
curl

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.

Scores

CVSS scores of CVE-2026-18924, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
NVDNVD · Modified3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS (exploitation in 30 days)
0.58% · top 52% of all CVEs (4 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.

Weakness

Affected products

  • 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
    • affected 8.15.0
    • affected 8.14.1
    • affected 8.14.0
    • affected 8.13.0
    • affected 8.12.1
    • affected 8.12.0
    • affected 8.11.1
    • affected 8.11.0
    • affected 8.10.1
    • affected 8.10.0
    • affected 8.9.1
    • affected 8.9.0
    • affected 8.8.0
    • affected 8.7.1
    • affected 8.7.0
    • affected 8.6.0
    • affected 8.5.0
    • affected 8.4.0
    • affected 8.3.0
    • affected 8.2.1
    • affected 8.2.0
    • affected 8.1.2
    • affected 8.1.1
    • affected 8.1.0
    • affected 8.0.1
    • affected 8.0.0
    • affected 7.88.1
    • affected 7.88.0
    • affected 7.87.0
    • affected 7.86.0
    • affected 7.85.0
    • affected 7.84.0
    • affected 7.83.1
    • affected 7.83.0
    • and 58 more

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-18924 badge
[![CVE-2026-18924](https://trackcve.app/badge/CVE-2026-18924.svg)](https://trackcve.app/cve/CVE-2026-18924)

Record last updated .