# CVE-2026-12707: Unbounded path event queue growth in quiche via peer-driven source connection ID rotation

> CVE-2026-12707: Unbounded path event queue growth in quiche via peer-driven source connection ID rotation. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-12707
Last updated: 2026-10-24T21:10:00Z

- Published: 2026-07-14 15:18 UTC · Updated: 2026-10-24 21:10 UTC · Assigner: cloudflare
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.44%, 38th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-770

## Description

Summary Cloudflare quiche was discovered to be vulnerable to memory resource exhaustion due to unbounded queuing of post-handshake client migration events. Impact quiche supports the connection migration features described in Section 9 of RFC 9000, which allows a single QUIC connection to survive changes in the network path. Although quiche implements the protections described in Section 9.3 of RFC 9000 to limit server state commitment, it was discovered that the collection of PathEvents, intended to be consumed by applications via the path\_event\_next() function, was not bounded. Once the QUIC handshake completed, a peer could exploit rapid source address migration in order to cause unbounded queuing of the PathEvent::ReusedSourceConnectionId type. Servers are vulnerable even if active connection migration is disabled. Mitigation:   \*   Applications can call path\_event\_next() to drain the PathEvent collection, mitigating the attack.   \*   Users are requested to upgrade to quiche 0.29.3 which is the earliest version that prevents excessive queueing of PathEvent::ReusedSourceConnectionId.

## Affected vendors and products

- Cloudflare: quiche

## Tracked companies

- [Cloudflare](https://rewindex.com/company/cloudflare.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-12707)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-12707)
- [https://github.com/cloudflare/quiche/security/advisories/GHSA-4q5x-gp38-rfp4](https://github.com/cloudflare/quiche/security/advisories/GHSA-4q5x-gp38-rfp4)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-12707 · Markdown: https://rewindex.com/cve/CVE-2026-12707.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-12707 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:26.743Z