CVE-2026-2634
published 2026-02-24CVE-2026-2634: Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing…
PriorityP351critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.31%
23.1th percentile
Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacker-controlled pages to be presented under spoofed domains. This vulnerability was fixed in Firefox for iOS 147.4.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | — | — |
| mozilla | firefox | < 147.4 | 147.4 |
| mozilla | firefox | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
osv9.8CRITICAL
vendor_debian9.8LOW
vendor_redhat6.5MEDIUM
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Red Hat
faraday: Faraday: Off-host request forgery due to protocol-relative host override
vendor_redhat·2026-05-19·CVSS 6.5
CVE-2026-33637 [MEDIUM] CWE-918 faraday: Faraday: Off-host request forgery due to protocol-relative host override
faraday: Faraday: Off-host request forgery due to protocol-relative host override
Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Versions 2.0.0 through 2.14.1 still allow protocol-relative host override when the request target is passed as a URI object (rather than a String) to Faraday::Connection#build_exclusive_url. This bypasses the February 2026 fix for GHSA-33mh-2634-fwr2 and enables off-host request forgery: a request built from a fixed-base Faraday::Connection can be redirected to an attacker-controlled host, forwarding connection-scoped values such as Authorization headers and default query parameters. This issue has been fixed in version 2.14.3.
A flaw was found in Faraday, an HTTP client library. This vulnerability allow
Debian
CVE-2026-2634: firefox - Malicious scripts could cause desynchronization between the address bar and web ...
vendor_debian·2026·CVSS 9.8
CVE-2026-2634 [CRITICAL] CVE-2026-2634: firefox - Malicious scripts could cause desynchronization between the address bar and web ...
Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacker-controlled pages to be presented under spoofed domains. This vulnerability affects Firefox for iOS < 147.4.
Scope: local
sid: resolved
Mozilla
Mozilla Foundation Security Advisory 2026-12: CVE-2026-2634
vendor_mozilla·CVSS 9.8
CVE-2026-2634 [CRITICAL] Mozilla Foundation Security Advisory 2026-12: CVE-2026-2634
Mozilla Foundation Security Advisory 2026-12
CVE: CVE-2026-2634
Product: Firefox for iOS
Impact: high
Fixed in: Firefox for iOS 147.4
OSV
CVE-2026-2634: Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacke
osv·2026-02-24·CVSS 9.8
CVE-2026-2634 [CRITICAL] CVE-2026-2634: Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacke
Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacker-controlled pages to be presented under spoofed domains. This vulnerability affects Firefox for iOS < 147.4.
GHSA
GHSA-gwgg-r543-4wvw: Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacke
ghsa_unreviewed·2026-02-24
CVE-2026-2634 [CRITICAL] CWE-451 GHSA-gwgg-r543-4wvw: Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacke
Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacker-controlled pages to be presented under spoofed domains. This vulnerability affects Firefox for iOS < 147.4.
No detection rules found.
No public exploits indexed.
Wiz
CVE-2026-2634 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 9.8
CVE-2026-2634 [CRITICAL] CVE-2026-2634 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-2634 :
NixOS vulnerability analysis and mitigation
Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacker-controlled pages to be presented under spoofed domains. This vulnerability affects Firefox for iOS < 147.4.
Source : NVD
## 9.8
Score
Published February 24, 2026
Severity CRITICAL
CNA Score 9.8
Affected Technologies
NixOS
Mozilla Firefox
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 19.4
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
cpe:2.3:a:mozilla:firefox
firefox
Sources
Alpine 3.12, 3.13, 3.14, 3.15, 3.16, 3.17, 3.18, 3.19, 3.20, 3.21, 3.22
Bugzilla
CVE-2026-33637 faraday: Faraday: Off-host request forgery due to protocol-relative host override
bugzilla·2026-05-19·CVSS 6.5
CVE-2026-33637 [MEDIUM] CVE-2026-33637 faraday: Faraday: Off-host request forgery due to protocol-relative host override
CVE-2026-33637 faraday: Faraday: Off-host request forgery due to protocol-relative host override
Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Versions 2.0.0 through 2.14.1 still allow protocol-relative host override when the request target is passed as a URI object (rather than a String) to Faraday::Connection#build_exclusive_url. This bypasses the February 2026 fix for GHSA-33mh-2634-fwr2 and enables off-host request forgery: a request built from a fixed-base Faraday::Connection can be redirected to an attacker-controlled host, forwarding connection-scoped values such as Authorization headers and default query parameters. This issue has been fixed in version 2.14.3.
2026-02-24
Published