VDB
RHSA-2026%3A25225
RHSA-2026%3A25225
PUBLISHED
CVSS 7.5 HIGH
A flaw was found in HTTP/2, affecting various web servers. A remote attacker can exploit this vulnerability by combining an HPACK compression bomb with a zero-byte flow-control window. This technique allows a small amount of data to expand into large memory allocations on the server, which are then held, leading to a denial of service (DoS) by rendering the server inaccessible.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | mod_http2-0:2.0.29-4.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-debuginfo-0:2.0.29-4.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-debuginfo-0:2.0.29-4.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-0:2.0.29-4.el10_2.1.src as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-debugsource-0:2.0.29-4.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-debugsource-0:2.0.29-4.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-0:2.0.29-4.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-0:2.0.29-4.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-debugsource-0:2.0.29-4.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-debuginfo-0:2.0.29-4.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-debugsource-0:2.0.29-4.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-0:2.0.29-4.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
| Red Hat | mod_http2-debuginfo-0:2.0.29-4.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10) | 2.0.29-4.el10 |
Timeline
- Jun 11, 2026 CVE Published
- Jun 11, 2026 CVE Updated
- Jun 11, 2026 Distribution Patch
- Jun 11, 2026 Distribution Patch
- Jun 11, 2026 Security Advisory
- Jun 11, 2026 Security Advisory
References
- https://access.redhat.com/errata/RHSA-2026:25225 advisory
- https://access.redhat.com/security/updates/classification/#important advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2485371 issue
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_25225.json advisory
- https://access.redhat.com/security/cve/CVE-2026-49975 advisory
- https://access.redhat.com/security/vulnerabilities/RHSB-2026-007 advisory
- https://www.cve.org/CVERecord?id=CVE-2026-49975 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-49975 advisory
- https://blog.calif.io/p/codex-discovered-a-hidden-http2-bomb advisory