CVE-2026-6750
published 2026-04-21CVE-2026-6750: Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird…
PriorityP345high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.48%
38.4th percentile
Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 150 | Firefox 150 |
| mozilla | firefox | < 115.35.0 | 115.35.0 |
| mozilla | firefox | < 150.0 | 150.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 140.0 < 140.10.0 | 140.10.0 |
| mozilla | firefox_esr | < Firefox ESR 115.35 | Firefox ESR 115.35 |
| mozilla | firefox_esr | < Firefox ESR 140.10 | Firefox ESR 140.10 |
| mozilla | thunderbird | < Thunderbird 150 | Thunderbird 150 |
| mozilla | thunderbird | < Thunderbird 140.10 | Thunderbird 140.10 |
| mozilla | thunderbird | < 140.10.0 | 140.10.0 |
| rhel10 | firefox-flatpak | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vendor_redhat8.8HIGH
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Red Hat
firefox: Privilege escalation in the Graphics: WebRender component
vendor_redhat·2026-04-21·CVSS 8.8
CVE-2026-6750 [HIGH] CWE-266 firefox: Privilege escalation in the Graphics: WebRender component
firefox: Privilege escalation in the Graphics: WebRender component
Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the Graphics: WebRender component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: firefox (Red Hat Enterprise Linux 7) - Affec
Red Hat
keycloak: Keycloak Authorization Header Parsing Leading to Potential Security Control Bypass
vendor_redhat·2026-01-07·CVSS 5.3
CVE-2026-0707 [MEDIUM] CWE-551 keycloak: Keycloak Authorization Header Parsing Leading to Potential Security Control Bypass
keycloak: Keycloak Authorization Header Parsing Leading to Potential Security Control Bypass
A flaw was found in Keycloak. The Keycloak Authorization header parser is overly permissive regarding the formatting of the "Bearer" authentication scheme. It accepts non-standard characters (such as tabs) as separators and tolerates case variations that deviate from RFC 6750 specifications.
A flaw was found in Keycloak. The Keycloak Authorization header parser is overly permissive regarding the formatting of the "Bearer" authentication scheme. It accepts non-standard characters (such as tabs) as separators and tolerates case variations that deviate from RFC 6750 specifications.
Statement: This vulnerability is rated Moderate for Red Hat because Keycloak's excessive tolerance for non-standard Be
Mozilla
Mozilla Foundation Security Advisory 2026-31: CVE-2026-6750
vendor_mozilla·CVSS 8.8
CVE-2026-6750 [HIGH] Mozilla Foundation Security Advisory 2026-31: CVE-2026-6750
Mozilla Foundation Security Advisory 2026-31
CVE: CVE-2026-6750
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.35
Mozilla
Mozilla Foundation Security Advisory 2026-32: CVE-2026-6750
vendor_mozilla·CVSS 8.8
CVE-2026-6750 [HIGH] Mozilla Foundation Security Advisory 2026-32: CVE-2026-6750
Mozilla Foundation Security Advisory 2026-32
CVE: CVE-2026-6750
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.10
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6750
vendor_mozilla·CVSS 8.8
CVE-2026-6750 [HIGH] Mozilla Foundation Security Advisory 2026-33: CVE-2026-6750
Mozilla Foundation Security Advisory 2026-33
CVE: CVE-2026-6750
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 150
Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6750
vendor_mozilla·CVSS 8.8
CVE-2026-6750 [HIGH] Mozilla Foundation Security Advisory 2026-30: CVE-2026-6750
Mozilla Foundation Security Advisory 2026-30
CVE: CVE-2026-6750
Product: Firefox
Impact: high
Fixed in: Firefox 150
Mozilla
Mozilla Foundation Security Advisory 2026-34: CVE-2026-6750
vendor_mozilla·CVSS 8.8
CVE-2026-6750 [HIGH] Mozilla Foundation Security Advisory 2026-34: CVE-2026-6750
Mozilla Foundation Security Advisory 2026-34
CVE: CVE-2026-6750
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.10
GHSA
Hono: JWT middleware accepts any Authorization scheme, not only Bearer
ghsa·2026-06-04
CVE-2026-47673 [MEDIUM] CWE-285 Hono: JWT middleware accepts any Authorization scheme, not only Bearer
Hono: JWT middleware accepts any Authorization scheme, not only Bearer
### Summary
The `jwt` and `jwk` middlewares do not verify that the `Authorization` header value uses the`Bearer` scheme. Any two-part header value — regardless of the scheme name in the first position — proceeds to JWT verification. A request presenting a valid JWT under a non-`Bearer` scheme identifier (such as `Basic` or `Token`) is authenticated identically to a correctly formed `Bearer` request.
### Details
When processing an `Authorization` (or custom) header, the middleware splits the value on whitespace and uses the second token as the JWT to verify. It does not check that the first token is `bearer` (case-insensitively). RFC 6750 specifies that JWT bearer tokens must be presented using the `Bearer` scheme; o
GHSA
GHSA-hqjc-gx24-xhpp: Privilege escalation in the Graphics: WebRender component
ghsa_unreviewed·2026-04-21
CVE-2026-6750 [MEDIUM] CWE-269 GHSA-hqjc-gx24-xhpp: Privilege escalation in the Graphics: WebRender component
Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.
GHSA
Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
ghsa·2026-01-08
CVE-2026-0707 [MEDIUM] CWE-551 Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
A flaw was found in Keycloak. The Keycloak Authorization header parser is overly permissive regarding the formatting of the "Bearer" authentication scheme. It accepts non-standard characters (such as tabs) as separators and tolerates case variations that deviate from RFC 6750 specifications.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-6750 firefox: Privilege escalation in the Graphics: WebRender component
bugzilla·2026-04-21·CVSS 8.8
CVE-2026-6750 [HIGH] CVE-2026-6750 firefox: Privilege escalation in the Graphics: WebRender component
CVE-2026-6750 firefox: Privilege escalation in the Graphics: WebRender component
Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.
Bugzilla
CVE-2025-6750 hdf5: HDF5 Heap Buffer Overflow [fedora-42]
bugzilla·2025-06-27·CVSS 1.9
CVE-2025-6750 [LOW] CVE-2025-6750 hdf5: HDF5 Heap Buffer Overflow [fedora-42]
CVE-2025-6750 hdf5: HDF5 Heap Buffer Overflow [fedora-42]
More information about this security flaw is available in the following bug:
https://bugzilla.redhat.com/show_bug.cgi?id=2375118
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wis
https://bugzilla.mozilla.org/show_bug.cgi?id=2023407https://www.mozilla.org/security/advisories/mfsa2026-30/https://www.mozilla.org/security/advisories/mfsa2026-31/https://www.mozilla.org/security/advisories/mfsa2026-32/https://www.mozilla.org/security/advisories/mfsa2026-33/https://www.mozilla.org/security/advisories/mfsa2026-34/https://access.redhat.com/errata/RHSA-2026:10757https://access.redhat.com/errata/RHSA-2026:10766https://access.redhat.com/errata/RHSA-2026:10767https://access.redhat.com/errata/RHSA-2026:12285https://access.redhat.com/errata/RHSA-2026:13537https://access.redhat.com/errata/RHSA-2026:15892https://access.redhat.com/errata/RHSA-2026:17477https://access.redhat.com/errata/RHSA-2026:17687https://access.redhat.com/errata/RHSA-2026:17688https://access.redhat.com/errata/RHSA-2026:17689https://access.redhat.com/errata/RHSA-2026:17690https://access.redhat.com/errata/RHSA-2026:19041https://access.redhat.com/errata/RHSA-2026:19131https://access.redhat.com/errata/RHSA-2026:19201https://access.redhat.com/errata/RHSA-2026:19348https://access.redhat.com/errata/RHSA-2026:19461https://access.redhat.com/errata/RHSA-2026:19462https://access.redhat.com/errata/RHSA-2026:19463https://access.redhat.com/errata/RHSA-2026:19464https://access.redhat.com/errata/RHSA-2026:19465https://access.redhat.com/errata/RHSA-2026:19466https://access.redhat.com/errata/RHSA-2026:19467https://access.redhat.com/errata/RHSA-2026:19468https://access.redhat.com/errata/RHSA-2026:19469https://access.redhat.com/errata/RHSA-2026:19542https://access.redhat.com/errata/RHSA-2026:19655https://access.redhat.com/errata/RHSA-2026:19704https://access.redhat.com/security/cve/CVE-2026-6750https://bugzilla.redhat.com/show_bug.cgi?id=2460102https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6750.json
2026-04-21
Published