7.5

CVE-2026-12523

Resource exhaustion in quiche HTTP/3 and QPACK layers

Summary



Cloudflare quiche's HTTP/3 layer was discovered to be vulnerable to resource exhaustion (i.e., memory) by means of specially crafted HTTP/3 frames.




Impact



HTTP/3 defines multiple frame types to support HTTP message exchanges and connection management. Each frame has a length and a payload whose length depends on the frame type. quiche was found to be vulnerable when parsing some frame types to pre-allocating memory based on the declared length. An attacker would not need to send the number of declared bytes to trigger this issue.



In addition, quiche was found to not apply QPACK decompression limits correctly. This could allow an attacker to send specially crafted HEADERS frames that would cause more memory commitment than otherwise advertised by MAX_FIELD_SECTION_SIZE (configured by set_max_field_section_size()).






Mitigation:

  *  

Users are requested to upgrade to quiche 0.29.3 which is the earliest version containing the fix for this issue.









Credits: Disclosed responsibly by Sébastien Féry
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerCloudflare
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Produkt quiche
Default Statusunaffected
Version 0.1.0
Version < 0.29.3
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.29% 0.211
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
cna@cloudflare.com 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-400 Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource.

https://github.com/cloudflare/quiche/security/advisories/GHSA-4fgf-9xrr-88gf