Medium [CVE-2026-16375] Site isolation issue in the Networking: HTTP component
This medium-severity Red Hat Linux advisory covers CVE-2026-16375 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory. Red Hat severity: Moderate — CVSS 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).
Weakness: CWE-653.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
- 140.13
- firefox-0:140.13.0-1.el10_2
- thunderbird-0:140.13.0-1.el10_2
- thunderbird-0:140.13.0-1.el10_0
- firefox-0:140.13.0-1.el10_0
- firefox-0:140.13.0-1.el7_9
- firefox-0:140.13.0-1.el8_10
- thunderbird-0:140.13.0-1.el8_10
- thunderbird-0:140.13.0-1.el8_4
- firefox-0:140.13.0-1.el8_4
- thunderbird-0:140.13.0-1.el8_6
- firefox-0:140.13.0-1.el8_6
- thunderbird-0:140.13.0-1.el8_8
- firefox-0:140.13.0-1.el8_8
- firefox-0:140.13.0-1.el9_8
- thunderbird-0:140.13.0-1.el9_8
- thunderbird-0:140.13.0-1.el9_2
- firefox-0:140.13.0-1.el9_2
- thunderbird-0:140.13.0-1.el9_4
- firefox-0:140.13.0-1.el9_4
- thunderbird-0:140.13.0-1.el9_6
- firefox-0:140.13.0-1.el9_6
- RHSA-2026:47101
- RHSA-2026:49621
- RHSA-2026:53445
- RHSA-2026:54181
- RHSA-2026:54248
- RHSA-2026:47105
- RHSA-2026:49922
- RHSA-2026:53455
- RHSA-2026:54180
- RHSA-2026:53453
- RHSA-2026:54259
- RHSA-2026:53454
- RHSA-2026:54339
- RHSA-2026:47104
- RHSA-2026:49921
- RHSA-2026:53475
- RHSA-2026:54185
- RHSA-2026:53444
- RHSA-2026:54182
- RHSA-2026:53446
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation
Upgrade to a fixed release: 140.13, firefox-0:140.13.0-1.el10_2, thunderbird-0:140.13.0-1.el10_2, thunderbird-0:140.13.0-1.el10_0, firefox-0:140.13.0-1.el10_0, firefox-0:140.13.0-1.el7_9. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Discussion(0)
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