CVE-2026-59248

high Red Hat
CVSS v3 Base Score
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Published: July 28, 2026 (40 days ago)
Last Modified: July 28, 2026
Vendor: Red Hat
Fix Available: ✓ Yes
Source: REDHAT

Description

A flaw was found in cowlib, an HTTP parser. An unauthenticated remote attacker could exploit this vulnerability by sending specially crafted HTTP/2 or HTTP/3 frames containing oversized HPACK or QPACK prefixed integers. This unbounded decoding process leads to excessive memory allocation and garbage collection, ultimately causing memory exhaustion and a denial of service (DoS) on the vulnerable server or client.

CWE

CWE-770

Affected Products

Red Hat Hardened Images

Fix Status

✅ Fix Available

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 cna.erlef.org 🔗 github.com